1987-12-01_PERMIT FILE - C1981017 ‎(173)‎

• Permit No: C1981017
• IBM Index Class Name: PERMIT FILE
• Doc Date: 12/1/1987
• Doc Name: Geology Description
• Section_Exhibit Name: Chapter III Section D
• Media Type: D
• Archive: No

Above the B bed , which occurs at. the top of
the Coal Basin Coal Interval . and is the principal seam
mined , the Lower Bowie Shale and Middle Sandstone Submembers
of the Bowie Shale Member of the Williams Fork Formation
underlie the Middle Bed coal bed .
Th.e Lower Bowie Shale ranges from 370 ' -425 ' ,
and consists of mudstones , sandstones and shales . The
outcropping Bowie occurs commonly in cliff faces around the
basin.
The Middle Sandstone varies from 30 ' -130'
thickness , is fine to medium-grained and, like the Rollins ,
outcrops around the basin in nearly vertical cliffs .
The Middle bed ranges from 4 ' -20 ' thickness ,
• and overlies the B bed , separated by approximately 450 ' of
rock. Interaction between the two beds is minimal to non-
existant .
The sequence above the Middle bed is known as
the Upper Bowie Shale Submember . It is 40' -60 ' thick and ,
like the Lower Bowie , commonly outcrops in cliff faces
around the basin.
The uppermost of the three prominent sand-
stones , and the top of the Bowie Shale Member , is the Upper
Sandstone Submember , which is approximately 100 ' thick and ,
like the Rollins and Middle Sandstone, outcrops in nearly
vertical cliffs around the basin. _
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