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<br />-Gr~~n Rlv~r Formation
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<br />Thickness ranges from 650 to 1,150 ft (200-
<br />350 m) <ind inCreases from northeast to aouth-
<br />west
<br />-c-Channel sandstone--Lenticular bodies of fine-
<br />grained crossbedded sandstone'. Found only in
<br />the Douglas Creek Member of the Green River For-
<br />mation. Some channels on poorly expoacd north-
<br />facing slope may not be shuwn
<br />_k1n-Tuff bed lit Kimball Hountain--8rown weathering
<br />analdtized tuff. about 2 In. (S em) thick. The
<br />bed occurs throughout the quadrangle but it is
<br />lenticular and discontinuous on the north side
<br />of Kimball Hountain in the northeast corner of
<br />the quadrangle
<br />Tgg Garden Gulch Member--Hostly papery fissile, kerogen-
<br />rich clay shale with calcareous sandstone, silt-
<br />stone and mudstone. Clay shale is light gray to
<br />black, often ostracodal; thin zones yield as much
<br />as 37.S gallons/ton (156 liters/tonne) oil
<br />(Fischer assay). Calcareous siltstone and cal-
<br />careous mudstone is found mainly at the top of
<br />the member. A persistent 10-30 ft (3-9 m) thick
<br />sandstone ledge is found 70-110 ft (21-34 ~)
<br />above the base throughout most of the southern
<br />half of the quadrangle. Thickness is about
<br />190-280 ft (58-86 m) and increases to the
<br />southeast
<br />-lp-Sandstone bed at Long Point--Lowermost persis-
<br />tent lacustrine bed; consists of varying amounts
<br />of quartz sand, ostracods, and oolites ....ith
<br />locally abundant gastropods, gontobasis sp. and
<br />vivaparufl sp. Named for exposures 3-10 ft (1-3
<br />m) thick on Long Point in Long Point quadrangle
<br />Only the base is shown on map
<br />_WASATCH FORMATION (EOCENE AND PALEOCENE)
<br />Twnu Shire Member, upper part (Eocene)--Mostly gray and
<br />maroon variegated mudstone; some lenticular out-
<br />crops of massive and crossbedded sandstone.
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<br />Sandstone is fine grained, and usually calc-
<br />cemented. Massive sandstone is bioturbated.
<br />Thickness 70-300 ft (21-92 m)
<br />Shire Member, middle part (Eocene)--Mostly gray
<br />clay shale with sandstone and siltstone in the
<br />upper half; mostly carbonaceous shale with coal,
<br />siltstone, and ostracoda1 limestone in the lower
<br />half. Sandstone is fine grained, even bedded to
<br />cros~bedded and occurs mainly as thin persistent
<br />units. Clay shale is similar to the Garden Gulch
<br />Member of Green River Formation. Coal beds are
<br />usually less than 4 in. (10 em) thick. Host of
<br />the middle part contains a significant amount of
<br />carbonate and weathers light gray in contrast to
<br />the gray and maroon variegated slopes above and
<br />below. Grades laterally into sandstone and varie-
<br />gated mudstone to the southwest. In the extreme
<br />southwestern corner of the quadran~le the upper
<br />half is predominantly sandstone. The lower
<br />half of the middle part has graded into mudstone
<br />and is mapped with the lower part of the Shire
<br />~lcmber. Thickness about 60-170 ft (18-52 m) and
<br />increases from southwest to northeast
<br />Shire Member, lower part (Eocenc)--Hostly gray and
<br />maroon variegated mudstone; some massive nnd
<br />crossbedded sandstone. Similar to upper part.
<br />Exposed in the southeastern corner of the quad-
<br />rangle, but is found in drill holes at least as
<br />far north as sec. 13, 14, T. 7 S.. R. 99 W. along
<br />Kimball Creek. Thickness about 135 it (41 m) in
<br />the southwestern corner: thickens in subsurface
<br />to 435 ft (133 m) along Kimball Creek
<br />Molina Member (Eoccnc)--Mostly thick units of
<br />ledge-forming sandstone separated by slope-
<br />forming gray nnd maroon mudstone. Sandstone
<br />is fine to medium grained, crossbedded to mas-
<br />sive; makes up about 40 percent of the member.
<br />Massive sandstone is bioturbated. Only upper
<br />part is exposed in quadrangle near the south-
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