394095 © -57 (In pocket)

UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY BULLETIN 1021 PLATE 35
= g FORMATION THICK-
id o AND iN FEET
g Py MEMBER
TERT [pateocene
Largely tuff, tuffaceous sandstone and shale, and brecc
‘Lower 2000 feet 1s largely green to brown tuff and thin
Livingston 7000+ breccia. Upper 5000 feet is less tuffaceous and con.
formation Sists mainly of tutfaceous sandstone and shale. Upper 300
feet marked by few thin beds of conglomerate
o | 3 10> | sandstone and shale
g 5 Virgelle sandstone and
3 undivided younger rocks 100% | Sandstone, gray. ledge forming
3 Sandstone and shale; chert-pebble conglomerate in flower
= 300 feet
Boulder River
w sandstone member 100+ | Sandstone, gray to brown, cliff-forming
© Colorado:
eked Shale, gray, basal; 30 feet or less thick overlain by about
sis 30 feet of flaggy siltstones and sandstones." Overlying
* beds, shale and thin beds of sandstone: shale becomes
3 silty and sandy in upper part
5
2 Basal conglomerate as much as 130 feet thick, contains
© Kootenai pebbles of chert and quartzite. Overlying beds mostly
formation 300 Concealed but include several lenticular beds of sandstone
and some mudstone
Morrisey Largely concealed; soil in lower part is red; lenses of sand-
52 formation 400 stone in middie and more massive near top
eo | 88
H% | >3
8B
7 Sandstone, brown-weathering, calcareous, glauconitic and
< ‘Swift formation 80 ‘ossiliferous
5 | Rierdon formation ° Limestone, basal 10 feet oolitic dense gray; overlain by
= 2 2) mostly concealed shale
> |s
22 |e wes Shale, greenish-gray in lower part on yellow basal sandstone.
33 |2 Pai 240 ‘Gray dense limestone near middie. Upper beds deeply
zs weathered, probably red shale in large part
Pe Quadrant quartzite 100__| Quartate, tghtyellowish: to reddist-gray, fine-gramed
22
zz Mostly concealed. Thin beds of red and gray limestone
g\es----- Amsden formation BO near middle lie above some red shale and siltstone
|
es
&
g
al!
olz Limestone, dense and finely crystalline, light: to medium-
Sl gray. Generally divisible in ascending order into (1) basal
a] 55 feet interbedded limestone and chert, making excellent
Lia marking beds: (2) about 235 feet of thin-bedded to massive,
|B ad variably argiliaceous to sandy limestone: unit very fossil
£19 ladison 860+ erous, many beds have abundant crinoid stem fragment:
Z\2 limestone (3) a 50-foot zone of argillaceous limestone with bioherms
S\= unit widespread in area; (4) about 180-feet of light-gray
2 dense limestone, includes several argiliaceous and silty
= layers and several crinoidal limestones, (6) about 340 feet
3 of dense lightgray limestone, partly brecciated and cherty
Largely concealed; yellow to brown soil from shale and thin
Three Forks shale 80 ES
Zz
= 5
zZ 35 — Limestone, argillaceous and silty, brownish-gray in lower
S| Bs potereny 390 half; 1s overlain by gray to greenish-gray limestone and
g 8 limestone breccia
gz
z chor Dolomite, cliffforming, dense, hight-gray and ight-yellowish-
95 Bighorn dolomite 200 gray Upper few feet is thin-bedded dolomitic limestone
o>
eee SO] Limestone and shale, imestone in part conglomerate with
si Snowy Range formation 175 | Shale, basal, greenish-gray; middle unit 1s limestone and
3 ‘upper unit 1s limestone and shale
3é Upper two-thirds massive dense and finely crystalline mottled
° Pilgrim limestone 175 limestone. Lower one-third largely edgewise limestone
_ conglomerate and limestone breccia that weather green
<
z=
2 Shal h- and reddish: hi
= hale, greenish- and reddish-gray, and thin beds of gray crystal-
3 c Park shale 380 line limestone
Ba
ie
6 Shale, greenish-gray, and thin beds of dense gray limestone,
Meagher limestone 65 make small ledges, weathers to light-yellowish-gray Soll
Wolsey shale 105 | Shale, greenish-eray, and a little thin-bedded limestone
Flathead quartzite 0-75 | Sandstone and quartzite, gray to reddish-gray, and conglomer-
atic near base
PRE-CAMBRIAN Gneiss, schist, granite Af

GENERALIZED STRATIGRAPHIC COLUMN OF ROCKS EXPOSED NEAR LIVINGSTON,
PARK COUNTY, MONTANA