UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY BULLETIN 1021 PLATE 33,
GROUP] THICK
svsrew| series] on | MEM | NAS | unr UTHOLOGIC DESCRIPTION FAUNA
MATION reer
+
= 5 & [At Oak Spring Butte, consists of two dark-colored,
BE] eis prominent, vesicular rhyolite beds and
HB) |e {uff South of Frenchman Flat, contams marly
A fossillerous limestone near base
é
Vatvate sp
Lymnaea cf L. meekiana
Lymnaea cf L.shumardl
Menetus of Df, retulus
pete | Bradyma sp.
=— [Triticites sp.
z ddoromingena, tolyparnminids,
2 11954 D_ Gray resistant and nonresistant lmestone, and sity material, {fee eet
z few pebbly mestone beds Trtiates ventrcosus, Bradyna sp.
& Composite? sp.
225 ine cerertan
‘Margnifera sp.
Trtiates ventrcosus, Polypore,
Straparolus (Euomphatus)
Calcitomelids, Millerlla?,
Textulanans, Tritcites sp,
Bradymna sp, “Pusulinella- Wedekindellina’,
[Endothyra?
Tolypamminids, “Fusutmelta-Wedekmdellina’?
£ Bradyina s
s © Lishtcolore, stopeforming. mestone and thin ribs of itomethae, Tatictes at 7 notus
S resistant limestone, some pebbly limestone ees) - .
3 Textulanans
z Textularians, ?Pseuidofusulmelta sp..
Zz Bradyina sp , Tite 5,
5 Stafetas9,?Schoagerna 3.
2 Rhabdomeson
2
2
Neilsonia
B _Lightcolored, platy, slope-formingsty limestone .
8 ‘A. Light-gray to dark smoky-gray, resistant and
2 nonresistant limestone
Zz
iB
8 . Varicolored argillite, conspicuous color banding
5 in upper part. Contains few beds of pebbiy
z conglomerate near mide part
Zil¢ Alternating sequence of brown conglomerate, quartz,
& {5 and arate, grades tofiner grained sedimentary rocks
e132 1m southern part of area
g|/¢e |e
a
z|2| 8
3) =| 8
2) a1 8
2/8 | %
5 Buff and brown slopeforming.arilite and shale, few
5 quartzite and conglomerate beds in upper part
3
3
Productus” seabreulis
‘Spiritercentronatus
Dark-gray, crinodal limestone and some chert Smrngopora ct. 8. acueata
Butt, platy-bedded, slope-forming limestone
Platyschisma mecoyt
& 3 Darkgray to black, cliffforming, limestone, becoming (Clade pora (as used includes Amphipora)
z sandier near top, aso contains quartzite and a
blz few beds of sandstone in upper part Sma dea
Bi 8
Jzlele
z2/3/4
gis
a
Atropa
Cladopora (as used includes Amphupora)
g 350 Resistant dark-colored limestone and dolomite as
se | 3 ‘Stromatoporoidea
2 | 2) 8 Aiternating sequence of gray, vugay, medium to coarsely
B13 | 260 7] cristalline dolomite and black, finely crystalline
éy) el ZIT] _ solo, etree restart EE,
2/3 SZ2F] howe 190 test aay to darcy tmesione and Povo Meal
= s Pas a dolomite, cherty in upper 50 feet, overlain by 95. a, .
= a = feet of light-gray to gray fine-grained quartzite, Tentaculites, Dalmanutes meekt,
Uopermost 175 fests varicolored dolomite Platyceras, Chonetes macrostnata,
= wath few quartate beds and chert eee
£ vA)
= 250 7] & Lach aray, finely crystatine, porly bedded dolomite
3 4 vai
z
=/.|28
s/f] 3404 4 F Dominantl ight aay, vugay. coarsely crystalline,
a = poorly bedded dolomite
e}e |g LZ
2;38)8 oo
3 & 2 Halystes or Cystihalysites
zi|2|2 E Poorly exposed, generally light gay to black
eile|32 365+ dolomite and chert
3 3 3
2/2/38
a|3s |e 1
z/e lg a0 D_ Lightgray to gay, fine-grained to ryptocrystalime dolomite, |
S| |? oor bedded, cittforming |
z 15 | u
8 1 ns © Dargray fo Back, renwlant, erty, chery dolomite
6 5 130 B_Light to medium gray resistant dolomite: Tentacles, Rhnuictya
é 95 A__Dark-gray to black gritty, resistant, cherty, dolomite
ee Nonresistant quartz. Lower 155 fet vancolored
3? 285 and contains doiomite near base,
a3 upper part wnte to gray
§ | Varcolored limestone with few dolomite beds, unformiy
H es bedded in 1- to 2foot beds, charactenstcally
z weathers rusty brown to bush gay
3
=
H. Gray to darkgray, masswve, resistant limestone,
535 fossilferous in lower300 feet [aitrospira fongwett, “Grvanelta?
Receptaculteselongatus, R.mammalatus,
Macturtes sp
@ Gray, slope-forming limestone containing pink
195 to buff-colored silty partings Ortciola
Zz rz 135 F Gray to darkgray resistant limestone Cephalopods ‘Matrospira?, Orthudvella,
S g — Large holochoanate cephalopods
3 m E Gray limestone in beds 6 inches to 2 feet thick, in places Le coolebed
8 ) contains buft sity and muddy material
5 &
2 D Bul, flaky, nodular shale with thin fossitiferous limestone | rotopomerons sp
&
q | &
§
Hy
2 © Gray limestone, extremely cherty in lower 250 feet
$ 615 some brownish-gray limestone and shale parted
H limestone n upper 95 feet
§
105 B Gray nodular, fossiliferous limestone
= ‘ith thin beds of buf, flaky shale / a
A Mottled gray and dark-eray imestone, upper 435 feet Xenostegtum sp.
@& 1m beds 6 mehes to 1 foot thick containing thin ‘Nanorthis 3p
: ray chert lenses, lower 175 feet massive Tetralobula sp
{
‘D Generally gray to dark gray dolomite and chert masses,
=2 A thin veinlets of ighteolored, coarsely crystalline
1105+] 4 dolomnte, few dark imestone beds in
4 Upper and lower parts
3 Z—D
g
g 7
5 —
iid
Bis
& a ide stus
§|s Pseudegnastus sp.
Tdahoia 3p
© Generally gay to dark gray, poorly bedded himestone, Witberna sp.
cherty in lower part
| Bienvitia sp.
Cogenelus 5p
\Geragnosts sp.

B_ Dark-gray limestone very well bedded in layers 1-2 ches cena eae eae
thick, cherty and resistant in upper part, slooe-forming oO neaies Sige tae er)
1n lower part, contains many silty partings Ps En ESE ECE

Korbladia sp. Dellea s.,
Ve 'A_Brownish-gray limestone with buff silty partings Litocephalus sp
$3 == Brown, fissile, shale with thin fossiliferous limestone Ch
gs = eared ton Pseudagnostus, Dunderbergia
235 D_ Darkgray to black, wellbedded, calcite, Mecromtra sp , acrotretd brachiopods,
sere eee eas
© Light-ray to gray, well bedded limestone, lower part weathers
oo yellowish gray
zislzl. 18 Atternatng layers of dark: and light-colored, well bedded
zle|lze]@ limestone and dolomite
ziclsi2
Ssi3|2 13
S|5
=| 2
‘A Dark-gray to back, finely enstaline imestone
Ee
i Dominantly hight and dark colored calc mestone
. c
8 8} Gray and buft sity imestone, middle part stope forming “curvanelia”
5 A
2/z
§ | #2 Buf to brown slope-orming shale containing few limestone
3 8" beds near base
= z
sé Kootenta p., “Grvanela
$3 245 ray algal imestone 2 :
Bi EA Seay algal imeston Prarmigansa? $9.
Biz
3s] 32
3 . Me reddish-brown, highly mi Is shal
te oa mormaroramom meneame One
2) 2 Poedumuas translans, Peachela sp
B | é
S 4
z
a] 2 General gray, poty bedded qurtate
3 containing few beds of shale
3|2

STRATIGRAPHIC COLUMN OF ROCKS EXPOSED IN THE ATOMIC
ENERGY COMMISSION NEVADA PROVING GROUNDS AREA

398882 0 - 57 (In pocket)