List of geochronologic names
List

List of geochronologic names

Section Title: List
Table Section Text: None

Name (English)	base/start (Ma)	top/end (Ma)	status	subdivision of	usage	named after	author, year

Aalenian	175.6 ± 2.0	171.6 ± 3.0	age	Jurassic	ICS	Aalen (Germany)	Mayer-Eymar, 1864

Abereiddian	471.8 ± 1.6	464	age	Ordovician	regional	Abereiddy (Wales)	Fortey et al., 1995

Actonian	454	453	age	Ordovician	regional	Acton Scott (England)	Bancroft, 1929

Adelaidean	1,300	542	age	Proterozoic	Australia	Adelaide

Aegean	245 ± 1.5	244	age	Triassic	Europe	Aegean Sea	Tozer, 1967

Aeronian	439.0 ± 1.8	436.0 ± 1.9	age	Silurian	ICS	Cwm-coed-aeron (Wales)	Cocks et al., 1971

Aftonian	0.6	0.48	age	Pleistocene	North America	Chamberlin, 1895

Agenian	23	20.4	ELMMZ	Miocene	Europe	Agen (France)	Alberdi & Aguirre, 1977

Aimchanian	1100	age	Proterozoic	Siberia

Aksayan	493	491.5	age	Cambrian	Russia, Kazakhstan	Ergaliev, 1980

Alaunian	216	211	sub-age	Triassic	Europe

Albertan	epoch	Cambrian	North America	Dawson, 1895

Albian	112.0 ± 1.0	99.6 ± 0.9	age	Cretaceous	ICS	Albia, Latin name of the river Aube (France)	d'Orbigny, 1842

Alding(i)an	36	30	age	Eocene	Australia

Algonkian	543	age	Proterozoic	international	Algonquian native peoples of Canada	Powell, 1890

Allerød	13,350 BP	12,700 BP	chronozone	Weichselian	Northern Europe	Allerød (Denmark)	Haltz & Milthers, 1901

Alportian	324.5	318.1 ± 1.3	age	Carboniferous	regional	Alport (England)	Ramsbotton, 1979

Altonian	19.0	15.9	age	Miocene	New Zealand	Alton Burn, Southland Region	Frye & Wilmann, 1960

Amazonian	~1,800	present	Martian epoch	Martian epoch	Mars	Amazonis Planitia	Greeley & Spudis, 1981

Amgan	513.0 ± 2.0	502	age	Cambrian	Russia, Kazakhstan	Guarari, 1955

Amstelian	2.588	2.40	super-age	Pleistocene	Netherlands	river Amstel	Harmer, 1896

Anglian	0.465	0.418	age	Pleistocene	Great Britain	East Anglia

Animikean	2,225	1,400	age	Proterozoic	North America (obsolete)	Hunt, 1873

Anisian	245.0 ± 1.5	237.0 ± 2.0	age	Triassic	ICS	Anisus, Latin name for the river Enns (Austria)	Mojsisovics, 1869

Antian	~2.12	~2.0	age	Pleistocene	Great Britain	River Ant (England)	West, 1962

Antwerpian	± 21	± 12	age	Miocene	Belgium (obsolete)	Antwerp	Gogels, 1879

Aphebian	2500	1600	age	Proterozoic	North America	Stockwell, 1964

Aptian	125.0 ± 1.0	112.0 ± 1.0	age	Cretaceous	ICS	Apt (France)	d'Orbigny, 1840

Aquatraversian	2.588	2.4	age	Pleistocene	Italy

Aquilan	85.2	82.2	NALMA	Cretaceous	North America	Russell, 1975

Aquitanian	23.03	20.43	age	Miocene	ICS	Aquitaine	Mayer-Eymar, 1857

Archean	none	2,500	eon	ICS	Dana, 1876

Arenig(-ian)	epoch	Ordovician	Europe	Arenig Fawr (Wales)	Sedgwick, 1847; Fearnsides 1905

Arikareean	30.8	20.6	super-age	Oligo-Miocene	North America	Wood "et al.", 1941

Arnold	43.0	34.3	epoch	Paleogene	New Zealand	Arnold River	Kingma, 1962

Arnsbergian	326	325	sub-age	Carboniferous	regional	Hudson & Cotton, 1943

Arowhanan	95.2	92.1	age	Cretaceous	New Zealand	Arowhana	Wellman, 1959

Arshantan	52.1	46.2	ALMA	Eocene	Asia	Romer, 1966

Artinskian	284.4 ± 0.7	275.6 ± 0.7	age	Permian	ICS	Arti (Russia)	Karpinsky, 1874

Arundian	341	339	age	Carboniferous	regional	from Hobbyhorse Bay, Castlemartin, Pembrokeshire, Wales (arundo is Latin for hobbyhorse)	Ramsbotton, 1974

Asbian	337.5	333	age	Carboniferous	regional	Little Asby Scar, Cumbria, England	Ramsbotton, 1979

Ashbyan	age	Ordovician	North America

Ashgill(-ian)	epoch	Ordovician	Europe	Ash Gill near Coniston, Cumbria	Marr, 1905

Asselian	299.0 ± 0.8	294.6 ± 0.8	age	Permian	ICS	river Assel (Kazakhstan)	Ruzhenchev, 1954

Astaracian	15	11.1	ELMMZ	Miocene	Europe	The Astarac (France)	Alberdi & Aguirre, 1977

Asturian	305	age	Carboniferous	Europe	Asturias	Stille, 1920

Atdabanian	530	524	age	Cambrian	Russia, Kazakhstan	Pelman, 1977

Atlantic	5,660 BP	9,220 BP	chronozone	Holocene	Northern Europe	the Atlantic Ocean	Blytt, 1876

Atokan	age	Carboniferous	North America	Spivey & Roberts, 1946

Aurelucian	460.9	457	age	Ordovician	Europe

Austinian	age	Cretaceous	south and east of the US	Austin, Texas	Murray, 1961

Autunian	~300	~275	age	Carboniferous-Permian	Europe	Autun (France)	Munier-Chalmas & Lapparent, 1893

Avernian	29.2	23.03	ELMMZ	Oligocene	Europe

Awamoan	20.0	17.5	age	Miocene	New Zealand	Thompson, 1916

Ayusokkanian	501.0 ± 2.0	494.5	age	Cambrian	Russia, Kazakhstan	Geyer & Shergold, 2000

Azoic see Archean

Badenian	16.3	12.8	age	Miocene	Paratethys	Baden (Austria)	Papp & Cicha, 1968

Baikalian	850	650	age	Proterozoic	Siberia	Lake Baikal	Pavloski, 1948

Bairnsdalian	15.0	10.5	age	Miocene	Australia

Baishaean	433	429	age	Silurian	China	Lu et al., 1974

Bajocian	171.6 ± 3.0	167.7 ± 3.5	age	Jurassic	ICS	Bayeux (France)	d'Orbigny,1844

Balcombian	15.5	15.0	age	Miocene	Australia	Hall & Pritchard, 1902

Baotan	460.9	454.5	age	Ordovician	China

Barremian	130.0 ± 1.5	125.0 ± 1.0	age	Cretaceous	ICS	Barrême (France)	Coquand, 1873

Barruelian	age	Carboniferous	Europe	George & Wagner, 1972

Barstovian	16.3	13.6	age	Miocene	North America	Wood "et al.", 1941

Bartonian	37.2 ± 0.1	40.4 ± 0.2	age	Eocene	ICS	Barton-on-Sea (South England)	Mayer-Eymar, 1857

Bashkirian	318.1 ± 1.3	311.7 ± 1.1	age	Carboniferous	ICS	Bashkortostan	Semikhatova, 1934

Basin Groups 1-9	4,150	3,850	subperiod	Prenectarium	Moon (unofficial)	groups of impact basins

Batesfordian	16.5	15.5	age	Miocene	Australia	Chapman & Singleton, 1923

Bathonian	167.7 ± 3.5	164.7 ± 4.0	age	Jurassic	ICS	Bath (England)	D´Orbigny, 1852

Batyrbayan	491.5	488.3	age	Cambrian	Russia, Kazakhstan	Apollonov & Chugaeva, 1983

Bavel Interglacial	1.03	0.96	age	Pleistocene	Netherlands	Bavel	Zagwijn & De Jong, 1964

Bavelian	1.03	0.85	super-age	Pleistocene	Netherlands	Bavel	Zawijn & De Jong, 1964

Baventian	~2.0	~1.87	age	Pleistocene	Great Britain	Easton Bavents (England)	West, 1961

Bedoulian	129.97	125.0	sub-age	Cretaceous	regional	Toucas, 1873

Beestonian	1.77	~0.8	age	Pleistocene	Great Britain	Beeston, Norfolk (England)	West & Wilson, 1966

Belvédère Interglacial	0.338	0.324	age	Pleistocene	Netherlands	quarry "Belvédère" (Maastricht)

Bendigonian	473.5	471.8	age	Ordovician	Australia	Bendigo, Victoria	Benson & Keble, 1935

Berriasian	145.5 ± 4.0	140.2 ± 3.0	age	Cretaceous	ICS	Berrias (France)	Coquand, 1871

Biber Glacial	~2.5	2.35	age	Pleistocene	Alps	river Biber (Germany)	Schaefer, 1953

Biber-Donau	age	Pleistocene	Alps

Blancan	4.9	1.8	age	Plio-Pleistocene	North America	Wood "et al", 1941

Black River(-an)	age	Ordovician)	North America	Vanuxem, 1842

Bolderian	<21	>16	age	Miocene	Belgium (obsolete)	Bolderberg	Dumont, 1850

Bolindian	450	443.7	age	Ordovician	Australia	Webby, 1976

Bølling	13,730 BP	13,480 BP	chronozone	Weichselian	Northern Europe	Bølling Sø (Denmark)	Iversen, 1942

Bolsovian	age	Carboniferous	Europe	Bolsover (England)	Jongsmans, 1928

Boomerangian	504	501	age	Cambrian	Australia	Öpik, 1979

Boreal	10,640 BP	9,220 BP	chronozone	Holocene	Northern Europe	boreal zone in ecology	Blytt, 1876

Bortonian	43.0	37.0	age	Eocene	New Zealand	Bortons	Hornibrook, 1961

Botomian	524	518.5	age	Cambrian	Russia, Kazakhstan	Repina, 1964

Bramertonian	~2.12	~2.0	age	Pleistocene	Great Britain	Bramerton Pits (England)	Funnell, Norton, West and Mayhew, 1979

Bridgerian	50.3	46.2	age	Eocene	North America	Wood et al., 1941

Brigantian	336	326.4 ± 1.6	age	Carboniferous	North America, Europe	Brigantes (Celtic tribe)	Ramsbotton, 1979

Brioverian	~680	~600	age	Neoproterozoic	Armorican Massif, France	Barrois, 1899

Brüggenian	2.588	2.4	chronozone	Pleistocene	Northwest Europe

Brunssumian	5.3	3.6	chronozone	Pliocene	Northwest Europe	Brunssum (The Netherlands)	Zagwijn, 1960

Bulitian	55.8	53	age	Eocene	California	Mallory, 1959

Bumbanian	55.7	52.1	ALMA	Eocene	Asia	Russell & Zhai, 1987

Buntsandstein	251.0 ± 0.4	246.6	epoch/subperiod	Triassic	Europe	German: bunte Sandstein = coloured sandstone	Von Alberti, 1834

Burdigalian	20.43	15.97	age	Miocene	ICS	Latin: Burdigala = Bordeaux (France)	Depéret, 1892

Burrellian	457	455	age	Ordovician	Europe	Glenburrell (England)	Fortey "et al.", 1995

Burzyan	1,400	1,375	age	Proterozoic	Russia	Kefler, 1952

Caerfai	542 ± 0.2	513 ± 2	age	Cambrian	Europe (obsolete)	Caerfai Bay (Wales)	Cowie "et al.", 1972

Calabrian	1.806	0.781	age	Pleistocene	Southern Europe	Calabria	Gignoux, 1913

Callovian	164.7 ± 4.0	161.2 ± 4.0	age	Jurassic	ICS	Kellaways (England)	d'Orbigny, 1849

Calymmian	1,600	1,400	period	Proterozoic	ICS	Plumb, 1991

Cambrian	542.0 ± 1.0	488.3 ± 1.7	period	Paleozoic	ICS	Cambria (Latin for Wales)	Sedgwick, 1835

Campanian	83.5 ± 0.7	70.6 ± 0.6	age	Cretaceous	ICS	Champagne (France)	Coquand, 1857

Canadian	epoch	Ordovician	North America

Cantabrian	305	age	Carboniferous	Europe	Wagner, 1965

Capitanian	265.8 ± 0.7	260.4 ± 0.7	age	Permian	ICS	Capitan Reef (Texas, US)	Richardson, 1904

Caradocian	460.9	449.5	epoch	Ordovician	Europe	Caradoc (Welsh king)	Murchison, 1839

Carboniferous	359.2 ± 2.5	299.0 ± 0.8	period	Paleozoic	ICS	carbon	Conybeare & Phillips, 1822

Carixian	189.6 ± 1.5	sub-age	Jurassic	regional	Lang, 1913

Carnian	228.0 ± 2.0	216.5 ± 2.0	age	Triassic	ICS	Carnic Alps (Austria)	Mojsisovics, 1869

Carpentarian	1,800	1,300	age	Proterozoic	Australia	Gulf of Carpentaria	Dunn et al., 1966

Casamajoran	54	48	age	Eocene	South America	Pascual, 1965

Cassian	1.1	0.8	age	Pleistocene	Italy	Mayer-Eymar, 1888

Cassinian	473	471.8	sub-age	Ordovician	North America	Flower, 1957

Castlecliffian	1.63	0.34	age	Pleistocene	New Zealand	Castlecliff	Thompson, 1916

Castlemanian	471	470	age	Ordovician	Australia	Castlemaine	Strachan, 1972

Cautleyan	447.5	446.5	age	Ordovician	Europe	Cautley Spout (England)	Marr, 1914

Cayugan	421.3 ± 2.6	416.0 ± 2.8	age	Silurian	North America	Clark & Schuchert, 1898

Cenomanian	99.6 ± 0.9	93.5 ± 0.8	age	Cretaceous	ICS	Latin: Cenomanium = Le Mans (France)	d'Orbigny, 1847

Cenozoic	65.5 ± 0.3	present	era	Phanerozoic	ICS	new life	Phillips, 1847

Cernaysian	55.9	55.0	ELMMZ	Paleocene	Europe	Lemoine, 1880

Chadian	345.3 ± 2.1	341	age	Carboniferous	regional	St Chad, Chatburn, Lancashire	Ramsbotton, 1979

Chadronian	38.0	33.9	age	Eocene	North America	Wood "et al.", 1941

Chamovnicheskian	306	305	age	Carboniferous	Russia

Champlanian	epoch	Ordovician	North America	Emmons, 1842

Changhsingian	253.8 ±0.7	251.0 ± 0.4	age	Permian	ICS	Changxing (China)	Sheng, 1963

Changlangpuan	523	518	age	Cambrian	China

Changshanian	496.8	492.5	age	Cambrian	China	Walcott, 1913

Chapadmalalan	4.0	3.0	age	Pliocene	South America	Kraglievich, 1930

Chasicoan	10.0	9.0	age	Miocene	South America	Cabrera & Kraglievich, 1928

Chatauquan	370	359.2 ± 2.5	age	Devonian	South America	Clark & Schuchert 1898

Chattian	28.4 ± 0.1	23.03	age	Oligocene	ICS	Chatti (ancient Germanic tribe)	Fuchs, 1894

Chautauquan	age	Devonian	North America

Chazyan	age	Ordovician	North America	Kay, 1958

Cheltenhamian	5.0	4.3	age	Pliocene	Australia	Mayer-eymar, 1881

Cheneyan	455	452	age	Ordovician	Europe

Cheremshankian	314.5	313.4	age	Carboniferous	Russia	Aisenverg, 1979

Chesterian	333	318.1	age	Carboniferous	North America	Worthen, 1860

Chewtonian	473	471	age	Ordovician	Australia	Harris & Thomas, 1938

Chokierian	325	324.5	sub-age	Carboniferous	regional	Chokier, Belgium	Hodson (1957)

Cincinnatian	451	443.7 ± 1.5	epoch	Ordovician	North America	Cincinnati	Meek & Worthen, 1865

Cisuralian	299.0 ± 0.8	270.6 ± 0.7	epoch	Permian	ICS	Waterhouse, 1982

Clansayesian	115.0	112.0	sub-age	Cretaceous	Breistroffer, 1947

Clarendonian	13.6	10.3	age	Miocene	North America	Wood "et al.", 1941

Clarkforkian	56.8	55.4	age	Paleo-Eocene	North America	Granger, 1914

Clifdenian	15.9	15.1	age	Miocene	New Zealand	Clifden	Fleming, 1959

Colhuehuapian	21.0	17.5	age	Miocene	South America	Flynn " et al.", 1995

Colloncurian	15.5	12.0	age	Miocene	South America	Groeber, 1929

Coniacian	89.3 ± 1.0	85.8 ± 0.7	age	Cretaceous	ICS	Cognac (France)	Coquand, 1857

Copernican	1,100	present	period	Moon	Copernicus

Costonian	460.9	459	age	Ordovician	regional	Bancroft, 1933

Couvinian	397.5 ± 2.7	391.8 ± 2.7	age	Devonian	Belgium (obsolete)	Couvin	d'Omalius d'Halloy, 1862

Cressagian	488.3 ± 1.7	486	age	Ordovician	Europe

Cretaceous	145.5 ± 4.0	65.5 ± 0.3	period	Mesozoic	ICS	Crete; Latin creta=chalk	d'Omalius d'Halloy, 1822

Croixan	epoch	Cambrian	North America

Cromerian	0.85	0.465	super-age/age	Pleistocene	Netherlands, Great Britain	Cromer (England)	Reid, 1882

Cryogenian	850	635.5 ± 1.2	period	Proterozoic	ICS	frozen beginning	Plumb, 1991

Cryptic	4,567	4,150	epoch	Prenectarian	Moon (unofficial)	hidden

Dacian	5.332 ± 0.005	3.600 ± 0.005	age	Pliocene	Paratethys	Dacia (Roman province)	Teisseyre, 1907

Dalanian (Dalaun)	313	310	age	Carboniferous	China

Danian	65.5 ± 0.3	61.7 ± 0.2	age	Paleocene	ICS	Denmark	Desor, 1847

Dannevirke	65.0	43.0	epoch	Paleogene	New Zealand	Dannevirke	Kingma, 1962

Dapingian	471.8 ± 1.6	468.1 ± 1.6	age	Ordovician	ICS	Daping (China)	Huang & Zhu, 1948

Darriwilian	468.1 ± 1.6	460.9 ± 1.6	age	Ordovician	ICS	Darriwil (Australia)	Hall, 1899

Datangian	345	333	age	Carboniferous	China	Ding, 1931

Datsonian	488.3 ± 1.7	485	age	Ordovician	Australia	Jones et al, 1971

Dawanian	472	471.8	age	Ordovician	North America	Xiang "et al.", 1980

Deerparkian	age	Devonian	North America	Cooper et al, 1942

Delamaran	512	504	age	Cambrian	North America	Palmer, 1998

Delmontian	7.5	2.9	age	Plio-Miocene	California	Kleinpell, 1938

Demingian	478.6	475	sub-age	Ordovician	North America	Flower, 1957

Derryan	311.7 ± 1.1	308	age	Carboniferous	North America	Thmpson, 1942

Deseadan	29.0	21.0	age	Oligo-Miocene	South America	Flynn & Wisher, 1995

Desmoinesian	age	Carboniferous	North America	Keyes, 1893

Deurnian	age	Miocene	Belgium (obsolete)	Deurne	de Heinzelin (1955)

Devensian	0.116	0.0115	age	Pleistocene	Great Britain	Devenses, Celtic tribe by the Deva (England and Wales)	Godwin, 1956

Devonian	416.0 ± 2.8	359.2 ± 2.5	period	Paleozoic	ICS	Devon (England)	Murchison & Sedgwick, 1839

Dewuan	333	318.1 ± 1.3	age	Carboniferous	China	Yang "et al.", 1962

Dinantian	359.2 ± 2.5	326.4 ± 1.6	epoch/sub-period	Carboniferous	Northern Europe	Dinant	Munier-Chalmas & Lapparent, 1893

Dittonian	418	age	Devonian	Wales and England (obsolete)	Ditton Priors, Shropshire, England	King, 1921

Divisaderan	42	36	age	Eocene	South America	Pascual, 1983

Dogger	175.6 ± 2.0	161.2 ± 4.0	epoch	Jurassic	Northern Europe	dogger=ironrich sediment type	Naumann, 1854

Dolgellian	492.5	488.3 ± 1.7	age	Cambrian	regional	Dolgellau, Wales	Harland et al., 1989

Domerian	183.0 ± 1.5	sub-age	Jurassic	regional	Bonarelli, 1894

Donau Glacial	1.7	1.35	age	Pleistocene	Alps	river Danube	Eberl, 1930

Donau-Günz	>2.35	age	Pleistocene	Alps

Dorogomilovksian	305	303.9 ± 0.9	age	Carboniferous	regional	Ivanov, 1926

Drenthian	0.238	0.17	chronozone	Pleistocene	Northwest Europe	Drenthe	Van Der Vlerk & Florschutz, 1950

Dresbachian	501	496.8	age	Cambrian	North America	Howell, 1944

Drumian	506.5	503	age	Cambrian	ICS	Drum Mountains (Utah, US)	Peng & Robinson, 2000

Duchesnean	42.0	38.0	age	Eocene	North America	Wood "et al"., 1941

Duckmantian	age	Carboniferous	Europe	Duckmanton Railway Cutting, England	Jongmans, 1928

Duntroonian	27.3	25.2	age	Oligocene	New Zealand	Duntroon	Fleming, 1959

Dyeran	524.5	512	age	Cambrian	North America	Palmer, 1998

Eaglefordian	age	Cretaceous	Gulf and Atlantic coast of the US	Eagle Ford, Dallas, Texas	Murray, 1961

Early Imbrian	3850	3800	period	Moon	Mare Imbrium

Eastonian	456	450	age	Ordovician	Australia	Packham, 1968

Eburonian	1.80	1.45	super-age	Pleistocene	Netherlands	Eburones, Germanic tribe	Zagwijn, 1963

Ectasian	1,400	1,200	period	Proterozoic	ICS	Plumb, 1991

Edenian	age	Ordovician	North America	Twenhofel, 1954

Ediacaran	635.5 ± 1.2	542.0 ± 1.0	period	Proterozoic	ICS	Ediacara Hills (Australia)	Cloud, 1972

Edmontonian	80.8	70.7	NALMA	Cretaceous	North America	Russel, 1975

Eemian	0.130	0.116	age	Pleistocene	Northern Europe	river Eem (Netherlands)	Harting, 1875

Eifelian	397.5 ± 2.7	391.8 ± 2.7	age	Devonian	ICS	the Eifel (Germany)	Beyrich, 1837

Egerian	25.8	20.3	age	Oligo-Miocene	Paratethys	Eger (Hungary)	Báldi & Seneš, 1968

Eggenburgian	20.8	18.3	age	Miocene	Paratethys	Eggenburg (Austria)	Steininger & Seneš, 1968

Eildonian	433	428.2 ± 2.3	age	Silurian	Australia	Thomas, 1947

Elsterian	0.465	0.418	age	Pleistocene	Northern Europe	river Weißen Elster (Germany)	Keilhack, 1911

Elvirian	326	324.5	age	Carboniferous	regional

Emilian	1.5	0.781	sub-age	Pleistocene	Italy	Ruggeri & Selli, 1948

Emscherian	89.5	83.5	age	Cretaceous	Germany	Munier-Chalmas & Lapparent, 1893

Emsian	407.0 ± 2.8	397.5 ± 2.7	age	Devonian	ICS	Bad Ems (Germany)	de Dorlodot, 1900

Ensenadan	1.2	0.8	age	Pleistocene	South America	Ameghino, 1889

Eoarchean	none	3.600	era	ICS	Plumb, 1991

Eocene	55.8 ± 0.2	33.9 ± 0.1	epoch	Paleogene	ICS	earliest recent	Lyell, 1847

Eratosthenian	3,200	1,100	period	Moon	Eratosthenes

Ergilian	35.1	33.8	ALMA	Oligo-Eocene	Asia	Russell & Zhai, 1987

Erian	391.8 ± 2.7	388	age	Devonian	North America	Dawson, 1871

Famennian	374.5 ± 2.6	359.2 ± 2.5	age	Devonian	ICS	the Famenne (Belgium)	Dumont, 1855

Fassanian	237 ± 2.0	233	sub-age	Triassic	Europe	Mojsisovics, 1895

Fengshanian	492.5	488.3 ± 1.7	age	Cambrian	China	Lu, 1962

Fennian	473	471.8	age	Ordovician	Europe	Fortey & Owens, 1987

Festiniogian	496.8	492.5	age	Cambrian	regional	(anglicised spelling of) Ffestiniog, Wales	Harland et al., 1990

Flaminian	0.5	0.3	age	Pleistocene	Italy

Flandrian	0.01	present	age	Holocene	Western Europe (obsolete)	Flanders	Rutot & Van den Broeck, 1885

Floian	478.6 ± 1.7	471.8 ± 1.6	age	Ordovician	ICS	Flo (Sweden)	Gradstein "et al", 2004

Florian	508	504	age	Cambrian	Australia

Fortunian	542.0 ± 1.0	528	age	Cambrian	ICS	Fortune Head (Canada)	Brassier "et al.", 1994

Franconian	496.8	492.5	age	Cambrian	North America	Lapparent, 1893

Frasnian	385.3 ± 2.6	374.5 ± 2.6	age	Devonian	ICS	Frasne (Belgium)	d'Omalius d'Halloy, 1862

Friasian	16.3	15.5	age	Miocene	South America	Kraglievich, 1930

Fujian	11.1	9.5	age	Miocene	Japan	Ikebe, 1977

Fupingan	3,100	2,600	age	Archaean	China

Furongian	501.0 ± 2.0	488.3 ± 1.7	epoch	Cambrian	ICS	Furong (China)	Cowie & Bassett, 1989

Gallic	130.0 ± 1.5	89.3 ± 1.0	epoch	Cretaceous	obsolete	Smith, 1815

Gargasian	121.0	115.0	sub-age	Cretaceous	regional	Kilian, 1887

Gashatan	56.9	55.7	ALMA	Paleo-Eocene	Asia	Romer, 1966

Gaultian	sub-age [Gault]	Cretaceous	regional	Smith, 1817

Gedinian	416.0 ± 2.8	411.2 ± 2.8	age	Devonian	Belgium (obsolete)	Gedinne	Dumont, 1848

Geiseltalian	48.5	42.7	ELMMZ	Eocene	Europe	Franzel & Haubold, 1986

Gelasian	2.588	1.806	age	Pleistocene	ICS	Gela (Italy)	Rio et al., 1998

Geringian	30.8	26.3	age	Oligocene	North America	Schultz & Falkenbach, 1968

Gisbornian	460.9	456	age	Ordovician	Australia	Thomas, 1960

Givetian	391.8 ± 2.7	385.3 ± 2.6	age	Devonian	ICS	Givet (France)	d'Omalius d'Halloy, 1839

Gleedonian	425.4	422.9 ± 2.5	age	Silurian	regional	Bassett "et al.", 1975

Gorstian	422.9 ± 2.5	421.3 ± 2.6	age	Silurian	ICS	Gorsty (farm at Ludlow, England)	Holland et al., 1980

Gramian	10.3	8.5	age	Miocene	Northern Germany	Hinsch, 1952

Grauvian	50.8	48.5	ELMMZ	Eocene	Europe	Savage & Russell, 1977

Guadalupian	270.6 ± 0.7	260.4 ± 0.7	epoch	Permian	ICS	Guadalupe Mountains (Texas, US)	Girty, 1908

Guandian	425.5	422	age	Silurian	China	Ting & Wang, 1937

Gulf(-ian)	epoch	Cretaceous	south and east of the US	the Mexican Gulf	Cobban & Reeside, 1952

Günz Glacial	2.35	age	Pleistocene	Alps	river Günz (Germany)	Penck & Bruckner, 1909

Günz-Mindel	age	Pleistocene	Alps

Gushanian	596.8	501	age	Cambrian	China	Kobayashi, 1935

Guzhangian	503	499	age	Cambrian	ICS	Guzhang (China)	Peng, 1992

Gzhelian	303.9 ± 0.9	299.0 ± 0.8	age	Carboniferous	ICS	Gzhel (Russia)	Nikitim, 1890

Hadean	none	4000	eon	ICS	Hades, hell	Cloud, 1972

Hadrynian	850	542	age	Neoproterozoic	North America	Fahrig "et al.", 1971

Hallian	~10.000	0	age	Holocene	California

Haranoyan	18.2	15.97	age	Miocene	Japan	Ikebe, 1977

Harnagian	459	458	age	Ordovician	regional	Bancroft, 1929

Harrisonian	24.8	20.6	age	Oligo-Miocene	North America	Wilson, 1960

Hastarian	359.2 ± 2.5	348	age	Carboniferous	regional	Conil, 1977

Haumurian	84	65.5	age	Cretaceous	New Zealand	Haumuri Bluff

Hautawan	3.1	2.2	sub-age	Plio-Pleistocene	New Zealand

Hauterivian	136.4 ± 2.0	130.0 ± 1.5	age	Cretaceous	ICS	Hauterive (Switzerland)	Renevier, 1873

Haweran	0.01	present	age	Holocene	New Zealand	Hawera	Thompson, 1917

Headonian	37.2	33.8	ELMMZ	Oligo-Eocene	Europe	Bosma, 1974

Helikian	1,600	850	age	Proterozoic	North America	Stockwell, 1964

Hemingfordian	20.6	16.3	age	Miocene	North America	Wood "et al.", 1941

Hemmoorian	age	Miocene	Northern Germany	Kautsky, 1925

Hemphillian	10.3	4.9	age	Mio-Pliocene	North America	Wood "et al.", 1941

Heretaungan	49.5	46.2	age	Eocene	New Zealand	Heretaunga Plains	Hornibrook & Harrington, 1957

Hesperian	~3,500	~1,800	Martian epoch	Mars	Hesperia Planum

Hettangian	199.6 ± 0.6	196.5 ± 1.0	age	Jurassic	ICS	Hettange-Grande (France)	Renevier, 1864

Hirnantian	445.6 ± 1.5	443.7 ± 1.5	age	Ordovician	ICS	Cwm Hirnant (Wales)	Bancroft, 1933

Holkerian	339	337.5	age	Carboniferous	regional	Ramsbotton, 1979

Holocene	11,800 BP	present	epoch	Quaternary	ICS	Greek: totally new	Gervais, 1867

Holsteinian	0.418	0.386	age	Pleistocene	Northern Europe	Holstein (Germany)	Jung, 1957

Homerian	426.2 ± 2.4	422.9 ± 2.5	age	Silurian	ICS	Homer (England)	Bassett et al., 1975

Honghuayuanian	478.6	472	age	Ordovician	China	Yang, 1990

Houldjinian	37.2	33.9	ALMA	Asia	Meng "et al.", 1998

Houthalenian	<21	>16	age	Miocene	Belgium (obsolete)	Houthalen	Hirsch, 1952

Hoxnian	0.418	0.386	age	Pleistocene	Great Britain	Hoxne (Suffolk)	West & Donner, 1956

Hsandgolian	33.8	24.0	ALMA	Oligocene	Asia	Meng "et al"., 1998

Huashibanian	318.1 ± 1.3	313	age	Carboniferous	China	Jin "et al.", 1962

Huayquerian	9.0	6.8	age	Miocene	South America	Pascual & Odreman, 1971

Hutchinsonian	21	20	age	Miocene	New Zealand	Fleming, 1959

Huronian	2,500	1,400	age	Proterozoic	worldwide (obsolete)	Logan & Murray, 1855

Ibexian	~505	471.8	age	Cambrian-Ordovician	North America	Ross, 1951

Icenian	2.4	~2	age	Pleistocene	Netherlands, England (obsolete)	Iceni, ancient tribe (England)	Harmer, 1900

Idamean	497	494	age	Cambrian	Australia	Öpik, 1963

Ilfordian	age	Pleistocene	British Isles	Ilford (England)	Bowen, 1978

Illinoian	0.17	0.125	age	Pleistocene	North America	Chamberlin, 1896

Illyrian	240 ± 2.0	237 ± 2.0	sub-age	Triassic	Europe	Tozer, 1967

Induan	251.0 ± 0.4	249.7 ± 0.7	age	Triassic	ICS	river Indus	Kiparisova & Popov, 1956

Ionian	0.781	0.126	age	Pleistocene	Southern Europe	Ionian Sea (between Greece and Italy)	Carianfi, 1995

Ipswichian	0.130	0.116	age	Pleistocene	Great Britain	Ipswich (England)	West, 1957

Irdinmanhan	46.2	40.4	ALMA	Eocene	Asia	Russell & Zhai, 1987

Irvingtonian	1.8	age	Pleistocene	North America	Irvington	Wood "et al.", 1941

Isuan	3,800	3,500	age	Archaean	Europe	McGregor, 1968

Itaboraian	59	57	age	Paleocene	South America	Paula-coutos, 1946

Ivorean	348	345.3 ± 2.1	age	Carboniferous	regional	Conil, 1977

Jacksonian	age	Eocene	southern US	Heilprin, 1882

Janjukian	30.0	27.5	age	Oligocene	Australia	Hall & Pritchard, 1902

Jeffersonian	475	473	sub-age	Ordovician	North America	Flower, 1979

Jinningian	1,750	800	age	Proterozoic	China	Peng, 2000

Jiusian	age	Carboniferous	China	Jin "et al"., 2000

Johannian	48	35	age	Eocene	Australia	Singleton, 1955

Judithian	82.2	80.8	NALMA	Cretaceous	North America	Russell, 1975

Julian	229.6 ± 2.0	222.5	sub-age	Triassic	Europe	Tozer, 1967 [Mojsisovics, 1895]

Jurassic	199.6 ± 0.6	145.5 ± 4.0	period	Mesozoic	ICS	Jura mountains	Brongniart, 1829

Kaburan	13.5	11.1	age	Miocene	Japan	Ikebe, 1977

Kaiatan	37.0	36.0	age	Eocene	New Zealand	Kaiata	Fleming, 1959

Kalimnan	4.3	3.4	age	Pliocene	Australia	Hall & Pritchard, 1902

Kansan	0.48	0.26	age	Pleistocene	North America	Geikie, 1894

Kapitean	6.5	5.0	age	Miocene	New Zealand	Kapitea Creek, West Coast Region	Fleming, 1959

Karatau	1,100	800	age	Proterozoic	Russia

Karoo Ice Age	~360	~260	ice age	Phanerozoic	Karoo (South Africa)

Karpatian	17.0	16.0	age	Miocene	Paratethys	the Carpathian Mountains	Cicha et al., 1967

Kashirskian	309.2	308.0	age	Carboniferous	Russia	Stepanov, 1962

Kasimovian	306.5 ± 1.0	303.9 ± 0.9	age	Carboniferous	ICS	Kasimov (Russia)	Theodorovich, 1949

Kasterlian	~4.7	~3.6	age	Pliocene	Belgium (obsolete)	Kasterlee	Dumont, 1882

Katian	455.8 ± 1.6	445.6 ± 1.5	age	Ordovician	ICS	Lake Katy (Oklahoma, US)	Bergstrom et al, 2003

Kattendijkian	~5	~3.6	age	Pliocene	Belgium (obsolete)	Kattendijke	Glibert & de Heinzelin, 1957

Kazanian	age	Permian	Russia	Netxaev, 1915

Kechienjian	1.9	1.5	age	Pleistocene	Japan	Ikebe, 1977

Keiloran	443.7 ± 1.5	433	age	Silurian	Australia

Kekeamuan	28.4	33.9	ALMA	Asia	Wang, 1981

Keuper	±230	199.6	epoch	Triassic	Europe	Von Alberti, 1834

Kimmeridgian	155.7 ± 4.0	150.8 ± 4.0	age	Jurassic	ICS	Kimmeridge (England)	d'Orbigny, 1852

Kinderhookian	359.2 ± 2.5	348	age	Carboniferous	North America	Bizat, 1928

Kinderscoutian	318.1 ± 1.3	317	age	Carboniferous	regional	Kinder Scout (England)	Bisat (1928)

Kirkfield	458	457	age	Ordovician	regional	Liddell, 1975

Kiscellian	25.8	age	Oligocene	Paratethys	Nolf & Brzobohaty, 1994

Klazminskian	303.9 ± 0.9	300.5	age	Carboniferous	regional	Ivanova & Khovorova, 1955

Korangan	117.5	108.4	age	Cretaceous	New Zealand	Koranga	Wellman, 1959

Krevyakinskian	306.5	306	age	Carboniferous	Russia	Ivanova & Khovorova, 1955

Kryzhanovan	1.9	1.2	age	Pleistocene	Eastern Europe

Kungurian	275.6 ± 0.7	270.6 ± 0.7	age	Permian	ICS	Kungur (Russia)	Stuckenberg, 1890

Lacian	217.4 ± 2.0	211	sub-age	Europe	Mojsisovics, 1895

Ladinian	237.0 ± 2.0	228.0 ± 2.0	age	Triassic	ICS	Ladini, people in northern Italy	Bittner, 1892

Lancefieldian	482	475	age	Ordovician	Australia	Harris & Keble, 1932

Lancian	70.7	65.5	NALMA	Cretaceous	North America	Russell, 1964

Landenian	<60	>55	age	Paleocene	Western Europe (obsolete)	Landen (Belgium)	Dumont, 1839

Landon	34.3	21.7	epoch	Paleo-Neogene	New Zealand	Landon Creek	Kingma, 1962

Langenfeldian	age	Miocene	Northern Germany

Langhian	15.97	13.65	age	Miocene	ICS	Serravalle Langhe (Italy)	Pareto, 1864

Langsettian	314.5	313.4	age	Carboniferous	regional	Langsett (England)	Jongsmans, 1928

Latdorfian	age	Oligocene	Germany	Mayer-Eymar, 1893

Late Imbrian	3,800	3,200	period	Moon	Mare Imbrium

Laventan	13.8	12.0	age	Miocene	South America	Madden, 1994

Leonardian	age	Permian	North America	Adams et al, 1939

Lias	199.6 ± 0.6	175.6 ± 2.0	epoch	Jurassic	Northern Europe	unclear	Mantell, 1833 [Smith, 1817]

Likhvinian	0.3	0.18	age	Pleistocene	Eastern Europe	Krasnenkov & Kazantseva, 1993

Lillburnian	15.1	12.7	age	Miocene	New Zealand	Lill Burn, Southland Region	Fleming, 1959

Linxiangian	454.5	449	age	Ordovician	China

Lishihhuangtuan	1.2	0.1	age	Pleistocene	China

Livian	335	331	age	Carboniferous	Belgium (obsolete)	Lives	Conil, 1977

Llandeilo (Llandeilean)	epoch/age	Ordovician	Europe	Llandeilo (Wales)	Murchison, 1835

Llandovery	443.7 ± 1.5	428.2 ± 2.3	epoch	Silurian	ICS	Llandovery (Wales)	Murchison, 1859

Llanvirn(-ian)	Llanvirn Farm near St Davids, Wales	Hicks (1881)	epoch	Ordovician	Europe	Hicks, 1875

Lochkovian	416.0 ± 2.8	411.2 ± 2.8	age	Devonian	ICS	Lochkov (Czech Republic)	Chlupac, 1972

Longfordian	27.5	16.5	age	Oligo-Miocene	Australia	Crespin, 1943

Longmaxian	443.7 ± 1.5	438	age	Silurian	China	Yin, 1949

Longobardian	233	229.6 ± 2.0	sub-age	Triassic	Europe	Mojsisovics, 1895

Longvillian	457	455	age	Ordovician	regional	Cheney Longville (England)	Bancroft, 1929

Longwangmioan	518	513	age	Cambrian	China	Bengston & Jell, 1990

Lopingian	260.4 ± 0.7	251.0 ± 0.4	epoch	Permian	ICS	Luoping (China)	Huang, 1932

Lotharingian	193.3 ± 0.7	189.6 ± 0.7	substage	Jurassic	Haug, 1910

Ludfordian	421.3 ± 2.6	418.7 ± 2.7	age	Silurian	ICS	Ludford (England)	Holland et al., 1980

Ludhamian	~2.52	~2.25	age	Pleistocene	Great Britain	Ludham (England)	Beck et al, 1972

Ludian	age	Eocene	western Europe	de Lapparent, 1893

Ludlovian	422.9 ± 2.5	418.7 ± 2.7	epoch	Silurian	ICS	Ludlow (England)	Murchison, 1854

Luisian	15.5	13.5	age	Miocene	California	Kleinpell, 1938

Lujanian	0.8	0.3	age	Pleistocene	South America	Ameghino 1889

Luliangian	2,350	1,750	age	Proterozoic	China

Luosuan	318.1	~314	age	Carboniferous	China	Jin et al, 1962

Lutetian	48.6 ± 0.2	40.4 ± 0.2	age	Eocene	ICS	Latin: Lutetia=Paris (France)	de Lapparent, 1883

Maastrichtian	70.6 ± 0.6	65.5 ± 0.3	age	Cretaceous	ICS	Maastricht (Netherlands)	Dumont, 1849

Maentwrogian	501	496.8	age	Cambrian	regional	Maentwrog (Wales)	Hicks, 1881

Malanghuangtuan	0.1	0.01	age	Pleistocene	China	Liu & Chang, 1964

Malm	161.2 ± 4.0	145.5 ± 4.0	epoch	Jurassic	Europe	Old English: malm = calcareous soil	Oppel & Quenstedt, 1858

Mangaorapan	53.0	49.5	age	Eocene	New Zealand	Mangaorapa	Marwick & Fleming, 1959

Mangaotanean	92.1	89.1	age	Cretaceous	New Zealand	Mangaotane	Wellman, 1959

Mangapanian	3.00	2.40	age	Plio-Pleistocene	New Zealand	Mangapani	Fleming, 1953

Maozhangian	513	509	age	Cambrian	China

Mapingian	310	299.0 ± 0.8	age	Carboniferous	China	Ting, 1928

Marahuan	2.2	1.8	sub-age	Pleistocene	New Zealand

Marjuman	504	494.5	age	Cambrian	North America	Ludvigsen & Westrop, 1985

Marsdenian	317	315.5	age	Carboniferous	regional	Marsden, West Yorkshire, England	Bisat (1928)

Marshbrookian	455	454	age	Ordovician	regional	Marshbrook (England)	Bancroft, 1929

Mayan	502	501 ± 2.0	age	Cambrian	Russia, Kazakhstan	Yarmoulyuk, 1946

Mayanan	1100	850	age	Proterozoic	Siberia	Datsenko et al, 1968

Mayoian	12.0	10.0	age	Miocene	South America	Villaroel, 1974

Mayvillian	453	447.5	age	Ordovician	North America	Foerste, 1905

Medinan	age	Silurian	North America	Clark & Schuchert, 1898

Meishuchuan	542	532	age	Cambrian	China	Qian, 1977

Melbournian	428.2 ± 2.3	416.0 ± 2.8	age	Silurian	Australia	Melbourne	Gregory, 1902

Melekesskian	313.4	311.7	age	Carboniferous	Russia	Aisenverg et al, 1979

Menapian	1.03	super-age	Pleistocene	Netherlands	Menapii, Germanic tribe	Zagweijn, 1957

Meramecian	340	333	age	Carboniferous	North America	Ulrich, 1904

Merioneth	501 ± 2	488.3 ± 1.7	epoch	Cambrian	Europe (obsolete)	Merioneth (Wales)	Cowie et al, 1972

Merksemian	~2.5	~2	age	Pleistocene	Belgium (obsolete)	Merksem	de Heinzelin, 1958

Mesoarchean	3,200	2,800	era	Archean	ICS	Plumb, 1991

Mesoproterozoic	1,600	1,000	era	ICS	Hofmann, 1987

Mesozoic	251.0 ± 0.7	65.5 ± 0.3	era	ICS	middle life	Philips, 1818

Messinian	7.246	5.332	age	Miocene	ICS	Messina (Italy)	Mayer-Eymar, 1867

Miaogoalingian	422	418.7	age	Silurian	China

Migneintian	486	478.6 ± 1.7	age	Ordovician	Europe	Fortey et al., 1995

Mindel	0.85	0.465	age	Pleistocene	Alps	river Mindel (Germany)	Penck, 1882

Mindel-Riss	0.465	0.238	age	Pleistocene	Alps

Mindyallan	501	497	age	Cambrian	Australia	Öpik, 1963

Miocene	23.03	5.332	epoch	Neogene	ICS	Greek: less recent	Lyell, 1847

Mississippian	359.2 ± 2.5	318.1 ± 1.3	epoch	Carboniferous	ICS	Mississippi River (US)	Winchell, 1870

Missourian	age	Carboniferous	North America	Keyes, 1873

Mitchellian	10.5	5.0	age	Plio-Miocene	Australia

Mohawkian	462	451	epoch	Ordovician	North America	Hall, 1842

Mohnian	13.5	7.5	age	Miocene	California	Kleinpell, 1938

Mokolian	2,050	900	age	Proterozoic	South Africa

Monroecreekian	26.3	24.8	age	Oligocene	North America	Monroe Creek	Wilson, 1960

Montehermosan	6.8	4.0	age	Plio-Miocene	South America	[Hermosean; Ameghino, 1889]	Simpson, 1940

Montezuman	529.5	524.5	age	Cambrian	North America	Palmer, 1998

Montian	~65	~61	age	Paleocene	Europe (obsolete)	Mons (Belgium)	Dewalque, 1868

Moridunian	478.6 ± 1.7	475	age	Ordovician	Europe	Moridunum (Wales)	Fortey & Owens, 1987

Morozovan	0.8	0.5	age	Pleistocene	Eastern Europe

Morrowan	age	Carboniferous	North America	Adams & Ulrich, 1904

Moscovian	311.7 ± 1.1	306.5 ± 1.0	age	Carboniferous	ICS	Moscow (Russia)	Nikitin, 1890

Motuan	103.3	100.2	age	Cretaceous	New Zealand	Motu River	Wellman, 1959

Muschelkalk	243 ± 2	235 ± 2	epoch	Triassic	Europe	German: limestone with mussels	Füchsel, 1761

Mustersan	48	42	age	Eocene	South America	Kraglievich, 1930

Myachkovskian	307.2	306.5	age	Carboniferous	Russia	Stepanov, 1962

Namibian	900	542	age	Neoproterozoic	South Africa	Namibia

Namurian	326.4	313.0	age	Carboniferous	Europe	Namur (Belgium)	Purves, 1883

Nanzian	48	35	age	Eocene	California

Navarroan	age	Cretaceous-Paleocene	south and east of the US	Navarro, Texas	Murray, 1961

Nebraskian	0.93	0.6	age	Pleistocene	North America (obsolete)	Shimek, 1909

Nectarian	3920	3850	period	Moon	Mare Nectaris

Needian	0.42	0.38	age	Pleistocene	Netherlands (obsolete)	Neede	Van der Vlerk & Florschutz, 1950

Nemakit-Daldynian	542	534	age	Cambrian	Russia, Kazakhstan	Savitsky, 1962

Neoarchean	2,800	2,500	era	Archean	ICS	Plumb, 1991

Neocomian	145.5	125.0/130.0	epoch	obsolete	Neocomium, Latin name for Neuchâtel	Thurmann, 1835

Neogene	23.0	2.588	period	Cenozoic	ICS	Hoernes, 1856

Neoproterozoic	1,000	542.0 ± 1.0	era	ICS	Hofmann, 1987

Neporatan	2.5	1.7	age	Pleistocene	Eastern Europe	Esu, 1980

Neustrian	55.0	50.8	ELMMZ	Paleo-Eocene	Europe	Fahlbusch, 1976

Ngaterian	100.2	95.2	age	Cretaceous	New Zealand	Ngateretere	Wellman, 1959

Niagaran	age	Silurian	North America	Sterry Hunt, 1871

Noachian	none	~3,500	Martian epoch	Mars	Noachis Terra

Noginskian	300.5	299.0 ± 0.8	age	Carboniferous	Russia	Ivanova & Khovorova, 1955

Nomentanan	0.24	0.13	age	Pleistocene	Italy

Nongshanian	62.9	56.9	ALMA	Paleocene	Asia	Ting, 1998

Norian	216.5 ± 2.0	203.6 ± 1.5	age	Triassic	ICS	Noric Alps (Austria)	Mojsisovics, 1869

Nukumaruan	3.1	1.8	age	Pleistocene	New Zealand	Nukumaru	Fleming, 1953

Nullaginian	2,500	1,800	age	Proterozoic	Australia	Dunn et al., 1966

Ochoan	age	Permian	North America	Adams et al, 1939

Odessan	1.2	0.8	age	Pleistocene	Eastern Europe

Okaian	0.5	0.3	sub-age	Ordovician	North America

Okehuan	1.1	0.37	age	Pleistocene	New Zealand	Fleming, 1962

Older Dryas	13,480 BP	13,350 BP	chron	Weichselian	Europe	Dryas octopetala (plant)

Oldest Dryas	13,860	13,780	chron	Weichselian	Europe	Dryas octopetala (plant)

Olenekian	249.5	245.9	age	Triassic	ICS	river Olenyok (Siberia)	Kiparisova & Popov, 1956

Oligocene	33.9 ± 0.1	23.03	epoch	Paleogene	ICS	"not so recent"	Beyrich, 1857

Onnian	453	449	age	Ordovician	regional	River Onny (England)	Bancroft, 1929

Oostermeer Interglacial	0.243	0.238	age	Pleistocene	Netherlands	Oostermeer

Opoitian	5.0	3.8	age	Pliocene	New Zealand	Opoiti	Fleming, 1959

Ordian	520	510	age	Cambrian	Australia	Öpik, 1968

Ordovician	488.3 ± 1.7	443.7 ± 1.5	period	Paleozoic	ICS	Ordovices, Celtic tribe	Lapworth, 1879

Orellan	33.9	33.3	age	Oligocene	North America	Prothero & Emry, 1996

Orleanian	20.4	15	ELMMZ	Miocene	Europe	Orléans (France)	Alberdi & Aguirre, 1977

Orosirian	2,050	1,800	period	Proterozoic	ICS	Plumb, 1991

Osagean	age	Carboniferous	North America	Branner, 1888

Otaian	21.7	19.0	age	Miocene	New Zealand	Otaio	Fleming, 1959

Ottnangian	18.3	17.0	age	Miocene	Paratethys	Ottnang am Hausruck (Austria)	Papp & Rögl, 1967

Oxfordian	161.2 ± 4.0	155.0 ± 4.0	age	Jurassic	ICS	Oxford (England)	d’Orbigny, 1849

Paibian	501.0 ± 2.0	496	age	Cambrian	ICS	Paibi (China)	Peng et al, 2004

Paleoarchean	3,600	3,200	era	Archean	ICS	Plumb, 1991

Paleocene	65.5 ± 0.3	55.8 ± 0.2	epoch	Paleogene	ICS	oldest recent	Schimper, 1847

Paleophytic	~450	~270	era	paleobotany	old flora

Paleogene	65.5 ± 0.3	23.0	period	Cenozoic	ICS	Hoernes, 1856

Paleoproterozoic	2,500	1,600	era	ICS	Hofmann, 1987

Paleozoic	542.0 ± 1.0	251.0 ± 0.7	era	ICS	old life	Sedwick, 1838

Pannonian	11.608 ± 0.005	7.246 ± 0.005	age	Miocene	Paratethys	Pannonia (Roman province)	Roth von Telegd, 1879

Pareora	21.7	15.9	epoch	Neogene	New Zealand	Pareora	Kingma, 1957

Pastonian	~1.87	1.77	age	Pleistocene	Great Britain	Paston, Norfolk (England)	West & Wilson, 1966

Payntonian	491	488.3 ± 1.7	age	Cambrian	Australia	Jones, 1971

Peligran	62.5	59	age	Paleocene	South America	Bonaparte, 1993

Pendleian	326.4 ± 1.6	326	age	Carboniferous	regional	Pendle Hill (England)	Hudson & Cotton, 1943

Pennsylvanian	318.1 ± 1.3	299.0 ± 0.8	epoch	Carboniferous	ICS	Pennsylvania (US)	Williams, 1891

Penutian	53	51	age	Eocene	California	Mallory, 1959

Permian	299.0 ± 0.8	251.0 ± 0.4	period	Paleozoic	ICS	Perm (Russia)	Murchison, 1849

Phanerozoic	542.0 ± 1.0	present	eon	ICS	visible life	Chadwick, 1930

Piacenzian	3.600	2.588	age	Pliocene	ICS	Piacenza (Italy)	Mayer-Eymar, 1858

Piripauan	86.5	84	age	Cretaceous	New Zealand	Piripaua	Wellman, 1959

Pleistocene	2.588	0.0117	epoch	Quaternary	ICS	youngest recent	Lyell, 1833

Pleniglacial	73,000 BP	14,500 BP	sub-age	Pleistocene	Northern Europe

Pliensbachian	189.6 ± 1.5	183.0 ± 1.5	age	Jurassic	ICS	Pliensbach (Germany)	Oppel, 1858

Pliocene	5.332	2.588	epoch	Neogene	ICS	newer recent	Lyell, 1847

Podolskian	308	307.2	age	Carboniferous	Russia	Ivanov, 1926

Poederlian	~3.5	~2.5	age	Pliocene	Belgium (obsolete)	Poederlee	Vincent, 1889

Pontian	7.246 ± 0.005	5.332 ± 0.005	epoch	Miocene	Paratethys	Pontus Euxinus, Latin name for the Black Sea	Le Play, 1842

Pontinian	0.1	0.01	age	Pleistocene	Italy	Blanc, 1937

Porangan	46.2	43.0	age	Eocene	New Zealand	Poranga	Hornibrook, 1961

Portlandian	age	Jurassic	British Isles	Isle of Portland (England)	Brongniart, 1829

Potsdamian	501 ± 2	488.3 ± 1.7	epoch	Cambrian	Germany	Walcott, 1891

Poundian	570	542 ± 0.3	age	Cambrian	Australia

Pragian	411.2 ± 2.8	407.0 ± 2.8	age	Devonian	ICS	Prague (Czech Republic)	Ziegler, 1979

Preboreal	11,560 BP	10,640 BP	chron	Northern Europe	before the Boreal

Precambrian	none	542.0 ± 1.0	none (before: eon)	worldwide	before the Cambrian	Logan, 1841

Pre-Illinoian	age	Pleistocene	North America	before the Illinoian	Leverett, 1929

Preludhamian	~2.52	~2.61	age	Plio-Pleistocene	Great Britain	before the Ludhamian	Funnell & West, 1977

Prenectarian	4567	3850	period	Moon	before the Nectarian

Prepastonian	~2.0	~1.87	age	Pleistocene	Great Britain	before the Pastonian	West, 1980

Pretiglian	2.588	2.40	super-age	Pleistocene	Netherlands	before the Tiglian Tegelen (The Netherlands)	Van der Vlerk, 1948

Priabonian	37.2 ± 0.1	33.9 ± 0.1	age	Eocene	ICS	Priabona (Italy)	Munier-Chalmas & De Lapparent, 1893

Pridoli(an)	418.7 ± 2.7	416.0 ± 2.8	epoch	Silurian	ICS	Přidoli (Czech Republic)	Prantl & Pribyl, 1948

Proterozoic	2,500	542.0 ± 1.0	eon	ICS	Emmons, 1888

Puercan	65.5	63.3	age	Paleocene-Cretaceous	North America	Wood et al, 1941

Purbeckian	age	Cretaceous-Jurassic	England (obsolete)	Isle of Purbeck (England)	Brongniart, 1829

Pusgillian	449	447.5	age	Ordovician	Europe	Pus Gill, Cumbria (England)	Dean, 1959

Putikian	0.37	0.01	age	Pleistocene	New Zealand	Fleming, 1953

Quaternary	2.588	present	period	Cenozoic	ICS	fourth part	Arduino, 1760

Qungzusian	532	523	age	Cambrian	China

Rancholabrean	age	Pleistocene	North America	Wood et al, 1941

Randian	3,000	2,500	age	Archaean	South Africa	Kent & Hughes, 1978

Rawtheyan	446.5	445.5	age	Ordovician	Europe	River Rawthey (England)	Brenchley & Cocks, 1982

Refugian	35.0	33.5	age	Oligo-Eocene	California	Schenck & Kleinpell, 1936

Reinbekian	age	Miocene	Northern Germany	Van Couvering, 1977

Relizian	16.5	13.5	age	Miocene	California	Kleinpell, 1934

Repettian	2.9	2.2	age	Plio-Pleistocene	California	Natalnd, 1952

Reuverian	3.5	2.558	chronozone	Pliocene	Northwest Europe	Reuver (The Netherlands)	Bifnot, 1972

Rhaetian	203.6 ± 1.5	199.6 ± 0.6	age	Triassic	ICS	Rhaetian Alps (Switzerland, Austria, Italy)	Gümbel, 1862

Rhuddanian	443.7 ± 1.5	439.0 ± 1.8	age	Silurian	ICS	Cwm-Rhuddian (Wales)	Cocks et al, 1971

Rhyacian	2,300	2,050	period	Proterozoic	ICS	Cowie 6 Basset, 1989

Richmondian	449	445.6 ± 1.5	age	Ordovician	North America	Winchell & Ulrich 1897

Riochican	57	54	age	Eo-Paleocene	South America	Simpson, 1940

Riphean	1,650	650	age	Proterozoic	worldwide (obsolete)	Shatsky, 1945

Riss Glacial	0.238	0.128	age	Pleistocene	Alps	river Riß (Germany)

Riss-Würm Interglacial	0.128	0.116	age	Pleistocene	Alps	Penck, 1882 [Penck & Burckner, 1909]

Roadian	270.6 ± 0.7	268.0 ± 0.7	age	Permian	ICS	Furnish, 1968

Robiacian	42.7	37.2	ELMMZ	Miocene	Europe	Savage & Russell, 1983

Romanian	3.6	1.8	age	Plio-Pleistocene	Paratethys	Krejci-Graf, 1932

Rotliegend(-es)	299	270.6	sub-period	Permian	unofficial	German for "Red foot wall".	A traditional copper mining term in the Mansfelder Land for the red oreless sandstone below the Kupferschiefer.

Runangan	36.0	34.3	age	Eo-Oligocene	New Zealand	Runanga	Finlay et al, 1945

Rupelian	33.9 ± 0.1	28.4 ± 0.1	age	Oligocene	ICS	river Rupel (Belgium)	Dumont, 1850

Ruscinian	4.9	3.5	ELMMZ	Pliocene	Europe	Ruscino, Latin for the Roussillon (France)	Kretzoi, 1962

Saalian	0.238	0.128	age	Pleistocene	Northern Europe	river Saale (Germany)	Stille, 1920

Sakian	494.5	493	age	Cambrian	Russia, Kazakhstan	Ergaliev, 1980

Sakmarian	294.6 ± 0.8	284.4 ± 0.7	age	Permian	ICS	river Sakmara (Russia)	Karpinski, 1874

Sandbian	460.9 ± 1.6	455.8 ± 1.6	age	Ordovician	ICS	Sandby, Sweden	Begstrom et al, 2003

Sangamonian	0.125	0.075	age	Pleistocene	North America	Leverett, 1898

Santacrucian	17.5	16.3	age	Miocene	South America	Ameghino, 1889

Santomian	1.81	1.5	sub-age	Pleistocene	Italy

Santonian	85.8 ± 0.7	83.5 ± 0.7	age	Cretaceous	ICS	Saintes (France)	Coquand, 1873

Sarmatian	12.7	11.6	age	Miocene	Paratethys	Sarmatians (ancient people)	Suess, 1866

Saxonian	~290	~258	age	Permian	Europe (obsolete)	Saxony	Munier-Chalmas & Lapparent, 1893

Saucesian	22.0	16.5	age	Miocene	California	Kleinpell, 1938

Scaldisian	~4	~2.5	age	Pliocene	Belgium (obsolete)	Scaldus, Latin name for the river Scheldt	Dumont, 1850

Scythian	251 ± 0.2	245 ± 1.5	Epoch	Early Triassic	Europe	Scythia	Arthaber, 1895

Selandian	61.7 ± 0.2	58.7 ± 0.2	age	Paleocene	ICS	Seeland (Denmark)	Rosenkrantz, 1924

Senecan	388	370	age	Devonian	North America	Clarke & Schuchert, 1898

Senonian	89.3	65.5	epoch	Cretaceous	unofficial	Sens (France)	d'Orbigny, 1842

Serpukhovian	326.4 ± 1.6	318.1 ± 1.3	age	Carboniferous	ICS	Serpukhov (Russia)	Nikitin, 1890

Serravallian	13.65	11.608	age	Miocene	ICS	Serravalle Scrivia (Italy)	Pareto, 1864

Sevatian	206	202.3 ± 1.5	sub-age	Triassic	Europe	Mojsisovics, 1895

Shanghuan	65.5	62.9	ALMA	Paleocene	Asia	Ting & Li, 1983

Shangsian	318.1	age	Carboniferous	China	Ting, 1931

Shaodongian	359.2 ± 2.5	349.5	age	Carboniferous	China	Hou, 1962

Sharamurunian	40.4	37.2	ALMA	Eocene	Asia	Russell & Zhai, 1987

Sheinwoodian	428.2 ± 2.3	426.2 ± 2.4	age	Silurian	ICS	Sheinwood (England)	Basset et al., 1975

Shermanian	457	454	age	Ordovician	regional	Kay, 1937

Shinulanian	438	433	age	Silurian	China	Ting, 1930

Sicilian	0.781	0.260	sub-age	Pleistocene	Italy	Sicily	Doderlein, 1872

Siderian	2,500	2,300	period	Proterozoic	ICS	Plumb, 1991

Silesian	326.4	299.0	subperiod	Carboniferous	Europe	Silesia	Leckwijck, 1960

Siegenian	age	Devonian	North America, Europe	Kayser, 1885

Silurian	443.7 ± 1.5	416.0 ± 2.8	period	Paleozoic	ICS	Silures, Celtic tribe	Murchison, 1835

Sinemurian	196.5 ± 1.0	189.6 ± 1.5	age	Jurassic	ICS	Semur-en-Auxois (France)	d'Orbigny, 1842

Sinian	800	542	age	Neoproterozoic	China	Willis et al, 1907

Soudleyan	458	457	age	Ordovician	regional	Soudley (England)	Bancroft, 1929

Southland	15.9	10.9	epoch	Neogene	New Zealand	Southland Region	Kingma, 1965

Springerian	age	Carboniferous	North America

St. David's	513 ± 2	501 ± 2	epoch	Cambrian	Europe (obsolete)	St Davids (Wales)	Cowie et al, 1972

Stampian	age	Oligocene	western Europe	Étampes (France)	d'Orbigny, 1852

Statherian	1,800	1,600	period	Proterozoic	ICS	Plumb, 1991

Stenian	1,200	1,000	period	Proterozoic	ICS	Cowie & Basset, 1989

Stephanian	303.9	299.0	age	Carboniferous	Europe	Saint-Étienne (France)	Mayer-Eymar, 1878

Steptoan	494.5	493	age	Cambrian	North America	Ludvigsen & westrop, 1985

Streffordian	452	449	age	Ordovician	Europe	Strefford (England)	Williams et al, 1972

Sturtian	~730	age	Neoproterozoic	worldwide, unofficial	Gregory, 1927

Subatlantic	2400 BP	0	chron	Holocene	Northern Europe	Sernander, 1889

Subboreal	5660 BP	2400 BP	chron	Holocene	Northern Europe	Sernander, 1889

Suchian	3.0	1.9	age	Plio-Pleistocene	Japan	Ikebe, 1977

Suevian	33.8	29.2	ELMMZ	Oligocene	Europe	Tobien, 1980

Sunwaptan	493	491	age	Cambrian	North America	Ludvigsen & Westrop, 1985

Susterian	8.5	5.3	chronozone	Miocene	Northwest Europe	Susteren (The Netherlands)	Van Der Hammenn et al., 1971

Swazian	4,000	3,000	age	Archaean	South Africa	Kent & Hughes, 1978

Syltian	age	Miocene	Northern Germany	Staesche, 1930

Tabenbulakian	24.0	23.03	ALMA	Oligocene	Asia	Meng & McKenna, 1998

Tangbagouan	359.2	age	Carboniferous	China	Jin et al, 2000

Taranaki	10.9	5.28	epoch	Neogene	New Zealand	Taranaki Region	Kingma, 1962

Tarantian	0.15	0.0115	age	Pleistocene	Southern Europe	Tarento (Italy)	Castradori & Cita, 1995

Tatarian	age	Permian	Russia	Tatarstan	Nikitin, 1887

Taxandrian	1.80	0.418	super-age	Pleistocene	Netherlands (obsolete)	Van Der Vlerk & Florschutz, 1950

Tayloran	age	Cretaceous	south and west of the US	Taylor, Texas	Murray, 1961

Telychian	436.0 ± 1.9	428.2 ± 2.3	age	Silurian	ICS	Pen-lan-Telych (Wales)	Cocks et al. 1973

Templetonian	510	508	age	Cambrian	Australia	Whitehouse, 1936

Teratan	89.1	86.5	age	Cretaceous	New Zealand	Te Rata, Gisborne Region	Wellman, 1959

Terreneuvian	542.0 ± 1.0	521	epoch	Cambrian	ICS	Terre-Neuve, French name for Newfoundland	Narbonne, 1987

Tertiary	65.5 ± 0.3	2.588	sub-era	Cenozoic	worldwide	third part	Arduino, 1760

Teurian	65.0	55.5	age	Paleocene	New Zealand	Te Uri	Hornibrook & Harrington, 1957

Thanetian	58.7 ± 0.2	55.8 ± 0.2	age	Paleocene	ICS	Isle of Thanet (England)	Renevier, 1874

Thuringian	285	251	age	Permian)	Europe (obsolete)	Thuringia (Germany)	Renevier, 1874

Thurnian	~2.25	~2.12	age	Pleistocene	Great Britain	River Thurne (England}	West, 1961

Tiffanian	60.2	56.8	age	Paleocene	North America	Granger, 1917

Tiglian	2.40	1.80	super-age	Pleistocene	Netherlands	Tegelen (The Netherlands)	Dubois, 1905

Tinguirirican	36	29	age	Oligo-Eocene	South America	Flynn & Wyss, 2004

Tithonian	150.8 ± 4.0	145.5 ± 4.0	age	Jurassic	ICS	Tithon (Greek mythology)	Oppel, 1865

Tiupampan	64.5	62.5	age	Paleocene	South America	Tiupampa	Marshall & de Muizon, 1988

Toarcian	183.0 ± 1.5	175.6 ± 2.0	age	Jurassic	ICS	Thouars (France)	d'Orbigny, 1849

Toyonian	518.5	513.0 ± 2.0	age	Cambrian	Russia, Kazakhstan	Hill, 1964

Tommotian	534	530	age	Cambrian	Russia, Kazakhstan	Rozanov et al, 1966

Tongaporutuan	10.9	6.5	age	Miocene	New Zealand	Tongaporutu, Taranaki Region	Fleming, 1959

Tongrian	age	Oligocene	western Europe	Dumont, 1839

Tonian	1,000	850	period	Proterozoic	ICS	Cowie & Bassler, 1989

Torrejonian	63.3	60.2	age	Paleocene	North America	wood et al, 1941

Tortonian	11.608	7.246	age	Miocene	ICS	Tortona (Italy)	Mayer-Eymar, 1858

Totomian	3.6	3.0	age	Pliocene	Japan	Ikebe, 1977

Tournaisian	359.2 ± 2.5	345.3 ± 2.1	age	Carboniferous	ICS	Tournai (Belgium)	Dumont, 1832

Tozawan	15.97	13.5	age	Miocene	Japan	Ikebe, 1977

Treenean	0.15	0.17	chronozone	Pleistocene	Northwest Europe

Tremadoc(-ian)	488.3 ± 1.7	478.6 ± 1.7	epoch	Ordovician	ICS	Tremadoc Bay (Wales)	Sedgwick, 1846

Trempealeauan	492.5	488.3 ± 1.7	age	Cambrian	North America

Trentonian	age	Carboniferous	North America

Triassic	251.0 ± 0.4	199.6 ± 0.6	period	Mesozoic	ICS	threefold	Von Alberti, 1834

Tubantian	0.116	0.0115	age	Pleistocene	Netherlands (obsolete)	Van der Vlerk & Florschütz, 1950

Turolian	8.7	4.9	ELMMZ	Mio-Pliocene	Europe	Turolium, Latin for Teruel (Spain)	Crusafont, 1965

Turonian	93.5 ± 0.8	89.3 ± 1.0	age	Cretaceous	ICS	Tours (France)	d'Orbigny, 1842

Tuvalian	222.5	217.4 ± 2.0	sub-age	Triassic	Europe	Mojsisovics, 1895

Tyrrhenian	0.26	0.01143	sub-age	Pleistocene	Italy	Tyrrhenian Sea	Issel, 1914

Ufimian	268	270,6	age	Permian	obsolete	Netxaev, 1915

Uintan	46.2	42.0	age	Eocene	North America	Wood et al, 1941

Ulangochuian	37.2	35.1	ALMA	Eocene	Asia	Li & Ting, 1983

Ulatisian	51	48	age	Eocene	California	Mallory, 1959

Ulsterian	age	Devonian	North America	Clarke & Schuchert, 1898

Undillian	506	504	age	Cambrian	Australia	Opik, 1979

Uquian	3.0	1.2	age	Plio-Pleistocene	South America	Uquia (Argentina)	Castellanos, 1923

Urutawan	108.4	103.3	age	Cretaceous	New Zealand	Urutawa Hill	Wellman, 1959

Vaalian	2,500	2,050	age	Proterozoic	South Africa	Kent & Hugh, 1978

Valanginian	140.2 ± 3.0	136.4 ± 2.0	age	Cretaceous	ICS	Valangin (Switzerland)	Desor, 1853

Vallesian	11.1	8.7	ELMMZ	Miocene	Europe	The Vallès (Spain)	Crusafont, 1950

Vendian	~610	542.0 ± 1.0	subera	Proterozoic	worldwide (obsolete)	Murchison, 1835

Venturian	2.2	1.9	age	Pleistocene	California	Natland, 1953

Vereiskian	311.7 ± 1.1	309.2	age	Carboniferous	Russia

Vierlandian	age	Miocene	Northern Germany

Vicksburgian	age	Oligocene	southern US	Heilprin, 1882

Villafranchian	3.5	1.1	ELMMZ	Plio-Pleistocene	Europe	Pareto, 1865

Virgilian	age	Carboniferous	North America	Moore, 1932

Visean	345.3 ± 2.1	326.4 ± 1.6	age	Carboniferous	ICS	Visé (Belgium)	Dumont, 1832

Vraconian	sub-age	Cretaceous	regional	Renevier, 1867

Waalian	1.45	1.20	super-age	Pleistocene	Netherlands	river Waal	Zagwijn, 1960

Waiauan	12.7	10.9	age	Miocene	New Zealand	Waiau River, Southland Region	Fleming, 1959

Waipawan	55.5	53.0	age	Eocene	New Zealand	Waipawa	Hornibrook & Harrington, 1957

Waipipian	3.60	3.00	age	Pliocene	New Zealand	Waipipi	Fleming, 1953

Waitakian	25.2	21.7	age	Oligo-Miocene	New Zealand	Waitaki River	Fleming, 1959

Waitotaran	3.8	3.1	sub-age	Pliocene	New Zealand	Waitotara River	Fleming, 1953

Waltonian	~2.52	age	Pliocene	Great Britain	Walton-on-the-Naze	Harmer,1900

Wanganui	5.28	present	epoch	Neogene-Quaternary	New Zealand	Whanganui	Kingma, 1962

Wangerripian	age	Paleo-Eocene	Australia	Singleton, 1953

Warendian	485	478.6	age	Ordovician	Australia	Jones et al, 1971

Warthian	0.15	0.13	chronozone	Pleistocene	Northwest Europe

Wasatchian	55.4	50.3	age	Eocene	North America	McGrew & Roehler, 1960

Waucoban	epoch	Cambrian	North America	Walcott, 1912

Weichselian	0.116	0.0115	age	Northern Europe	Weichsel, German name for the river Vistula (Poland)	Keilhack, 1926

Wenlock(-ian)	428.2 ± 2.3	422.9 ± 2.5	epoch	Silurian	ICS	Much Wenlock (England)	Murchison, 1833

Werrikooian	1.00	1.806	age	Pleistocene	Australia	Hall & Pritchard, 1902

Westphalian	313.0	303.9	age	Carboniferous	Europe	Westphalia (Germany)	de Lapparent & Munier-Chalmas, 1892

Whaingaroan	34.3	27.3	age	Oligocene	New Zealand	Whaingaroa, Waikato Region	Finlay & Marwick, 1947

Wheelerian	1.9	0.01143	age	Pleistocene	California	Natland, 1953

Whiterockian	471.8 ± 1.6	462	age	Ordovician	North America	Cooper, 1956

Whitlandian	475	473.5	age	Ordovician	Europe	Whitland (Wales)	Owens & Fortey, 1987

Whitneyan	33.3	30.8	age	Oligocene	North America	Wood, 1937

Whitwellian	426.2 ± 2.4	425.4	age	Silurian	regional	Whitwell Coppice (England)	Bassett et al, 1975

Wisconsinan	0.075	0.01	age	Pleistocene	North America	Geikie, 1894

Wolfcampian	age	Permian	North America	Udden, 1917

Wolstonian	0.238	0.128	age	Pleistocene	Great Britain	Wolston (England)	West & Donner, 1956

Woodbinian	age	Cretaceous	Gulf and Atlantic coast of the US	Murray, 1961

Wordian	268.0 ± 0.7	265.8 ± 0.7	age	Permian	ICS	Udden, 1916

Wuchenghuangtuan	2.4	1.2	age	Pleistocene	China

Wuchiapingian	260.4 ± 0.7	253.8 ± 0.7	age	Permian	ICS	Kaimera & Nakazawa, 1973 [Sheng, 1962]

Würm Glacial	0.116	0.0115	age	Pleistocene	Alps	river Würm (Germany)	Penck & Bruckner, 1909

Wutaian	2,600	2,350	age	Archaean-Proterozoic	China	Zhang, 1951

Xiaodushanian	299	age	Carboniferous	China	zhou et al, 1987

Xiushanian	429	425.5	age	Silurian	China	Ge, 1980

Yanguan	349.5	345	age	Carboniferous	China

Yarmouthian	0.26	0.17	age	Pleistocene	North America	Aegean Sea	Leverett, 1898

Yatalan	3.4	2.0	age	Plio-Pleistocene	Australia	Ludbrook, 1963

Yeadonian	315.5	314.5	age	Carboniferous	regional	Yeadon (England)	Hudson, 1945

Younger Dryas	12,700 BP	11,560 BP	chron	Weichselian	Northern Europe	Dryas octopetala (plant)

Ypeenian	470	468.1	age	Ordovician	Australia

Ypresian	55.8 ± 0.2	48.6 ± 0.2	age	Eocene	ICS	Ypres, French name for Ieper (Ieper) in Belgium	Dumont, 1849

Ynezian	61.5	55.8	age	Paleocene	California	Mallory, 1959

Yuian	9.5	3.6	age	Plio-Miocene	Japan	Ikebe, 1977

Yurmatian	1,375	1,100	age	Proterozoic	Russia	Keller, 1952

Yuzanjian	1.5	0.75	age	Pleistocene	Japan	Ikebe, 1977

Zanclean	5.332	3.60	age	Pliocene	ICS	Zancla, old name for Messina (Italy)	Sequenza, 1868

Zechstein	±270	±250	sub-period	Permian	Europe (unofficial)	Lehmann, 1756

Zemorrian	33.5	22.0	age	Oligo-Miocene	California	Kleinpell, 1938

Zhungxian	505	501	age	Cambrian	China

Zuzhungian	509	503	age	Cambrian	China

Sentence(s)

In the British sub-stage of the Carboniferous period, the Marsdenian derives its name from Marsden.

final_sentence: In the British sub-stage of the Carboniferous period, the Marsdenian derives its name from Marsden.