List of Global Boundary Stratotype Sections and Points
Silurian

List of Global Boundary Stratotype Sections and Points

Section Title: Silurian
Table Section Text: None

Epoch	Stage	Age (mya)	Status	GSSP location	Defining markers	Geographic Coordinates	References

Přídolí	423	-	Požáry Section, Řeporyje District, Prague, Czech Republic	Biologic: First appearance of Monograptus parultimus (Graptolite).	50°01′40″N 14°19′30″E / 50.0277°N 14.3249°E

Ludlow

Ludfordian	425.6	-	Sunnyhill, Ludlow, England	Imprecise GSSP. Biologic: Near first appearance of Saetograptus leintwardinensis (Graptolite).	52°21′33″N 2°46′38″W / 52.3592°N 2.7772°W

Gorstian	427.4	-	Pitch Coppice, Ludlow, U.K.	Biologic: First appearance Saetograptus (Colonograptus) varians	52°21′33″N 2°46′38″W / 52.3592°N 2.7772°W

Wenlock

Homerian	430.5	-	Whitwell Coppice, Homer, England	Biologic: First appearance of Cyrtograptus lundgreni (Graptolite).	52°36′56″N 2°33′53″W / 52.6156°N 2.5647°W

Sheinwoodian	433.4	-	Hughley Brook, Apedale, U.K.	Imprecise GSSP. Will be reexamined.	52°34′52″N 2°38′20″W / 52.5811°N 2.6389°W

Llandovery

Telychian	438.5	-	Cefn-cerig Road, Llandovery, Wales	Biologic: Above extinction of Eocoelia intermedia, below lowest succeeding species Eocoelia curtisi (Brachiopod). Biologic: Near first appearance of Monograptus turriculatus (Graptolite).	51°58′12″N 3°47′24″W / 51.9700°N 3.7900°W

Aeronian	440.8	-	Trefawr Track, Llandovery, U.K.	Biologic: First appearance of Monograptus austerus sequens (Graptolite).	52°01′48″N 3°42′00″W / 52.0300°N 3.7000°W

Rhuddanian	443.8	-	Dob's Linn, Moffat, U.K.	Biologic: First appearance of Akidograptus ascensus and Parakidograptus acuminatus (Graptolite). 1.6 m above the base of the Birkhill Shale Formation.	55°26′24″N 3°16′12″W / 55.4400°N 3.2700°W

Sentence(s)

Apedale is one of the Global Boundary Stratotype Sections and Points for the Sheinwoodian of the Wenlock.

final_sentence: Apedale is one of the Global Boundary Stratotype Sections and Points for the Sheinwoodian of the Wenlock.