WSP07960

• File Number: 8221.110.J
• Description: Juniper-Cross Mountain Project
• State: CO
• Basin: Yampa/White
• Date: 9/3/1979
• Title: The Geological & Paleontological Environment of the Juniper-Cross Mountain Project Area and Plan for the Preservation of Paleontological & Unique Geological Resources in the Project Area
• Water Supply Pro - Doc Type: Report/Study

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8

ROCK UNIT

Lewis Shale

VaJtk-glta.y Umey l>IuJ1,e and l>oM tlU.n-bedded Umey
l>and6tone; mll1Li.ne. About 600 oee.t tlU.ck.

Williams Fork Formation

IntVt.bedded buoo l>and6tone, glta.y l>ha.le, bltown c.a.It-
bonaceolUl l>ha.le, and eoa.t bed6 M much MID oee.t
th.i.c.k; con:tIU.YI.<I much poolLf.y expol>ed l>ha.le .i.n m.i.d.de.e
paJ/.t; about 2,500 oee.t tlU.ck.

Il es Formation

IntVt.bedded buoo o.i.ne-gJta.ined l>and6tone, glta.y
l>ha.le, b./town caJtbonaceolUl l>haJ.e, and a oew tlU.n
bed6 00 eoa.t; about 1,100 oee.t tlU.ck.

Mancos Shale

VlVtk-glta.y mll1Li.ne l>hale con:tIU.n.i.ng tlU.c.k Mnd6tone
bed6 neaJL top and bottom. I nc..eu.du buo 0 lentieui.1Vt
l>and6tone 00 the FJtOntiVt. Sand6tone MembVt. (UppVt.
CJr.e.ta.ceolUl), about 200 oee.t tlU.ck, undVll.lLi.n by
glta.y l>WeeolUl l>WU 00 theMoWlty SWe MembVt.
(LowVt. ClteT..a.ceol.l.6), about 100 oee.t tlU.ck, at bMe
00 Mancol>. Benton-Ue bed6 occUlt.i.n both memb~,.:
To.ta.l. tlU.eknul> about 5,500 oee.t.

Dakota Sandstone

UppVt. paJ/.t .u, Ught-glta.y quaJr.;tUtic l>and6tone con-
ta.i.n.i.ng dlVtk chVt.t pebblu and a oew tlU.n bed6 00
dIVl.k-glta.y .6hale; rr0fde.e pMt. .u, clU.eoly dIVl.k-glta.y
o.i.l>l>Ue l>ha.le; lowVt. pMt., loca..U.y abunt, .u, Ught-
glta.y l>and6tone con:tIU.n.i.ng dlVtk ehVt.t pebblu; tlU.ek-
nUl> 00 oOJuna.Uon lta.ngu w.i.de1.y, but geneIta.Uy, .u,
about 70 to 100 oee.t.

Morrison Formation

IntVt.bedded vll1Li.colO.lted .6U;Utone and c1.a.Yl>tone,
Ught-glta.y Mnd6tone, and l>Ome chVt.t-pebble con-
glomVt.ate; a oew lentieui.1Vt bed6 00 nodui.lVl. Ume-
l>tone neaJL top; whU.i..6h-glta.y mMl>.i.ve VVt.y Mne-
gJiILi.rie:d -l>af'1.d.6tonelta:ng.i.ng',oltom1.5 :toM: much M
130 oeet .i.n tlU.cknul> at bMe; about 600 6ee.t
tlU.ek.