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<br />Sample Plo.
<br />~5
<br />Coalmont Formation (part)
<br />5.
<br />feet
<br />Sandstone, light yellowish Dray, very coarse-grained, slightly
<br />argillace.o,us., lantitularly badded with carbonaceous dabris
<br />on irregular bedding planes and speckled throughout, hard
<br />tough to rip. Lower contact is abrupt, a channel contact.
<br />This is apparently the basal part of the Ridoe Sandstone
<br />t•iember shown on Flate C ................................... ~
<br />,14 Shale, very silty to fine-drained. sandstone, m=_dium Dray io
<br />:~- dark yellowish gray, with abundant fractures (perhaps due
<br />to proximity to a fault), with limonite r=_sidues and car-
<br />bonaceous material on fractures ........................... 9
<br />:13 Shale, brownish gray alternating with lenticular beds of
<br />.~ coal and carbonaceous shale; coal perhaes 15";, carbonaceous
<br />shale 10>, brownish gray shale 75;x ..........................13
<br />r12 Sandstone, light yellowish gray, medium- to coarse-grained,
<br />irregular to almost massive bedding, with carbcnacaous
<br />specks, residues, fracments, and m~.ner very small lsnsas,
<br />with limonitic staining on irregular fractures. =.attom
<br />contact abrupt, channel contact ........................... 4
<br />;'11 Siltstone, medium tray, sandy, with limonitic staining and
<br />'l carbonaceous residues cn irregular fractures, with irreg-
<br />ular medium bedding, with abundant subconchoidal fract-
<br />ures, grades into silty shale at too .................... ~
<br />- Sandstone, light pray to yellowish gray, vary fine- to
<br />medium-Drained, radium bedded, finely but prominently
<br />cros=-laminated, with limor~itic stainino on rractures,
<br />with minor carbonaceous specks, flakas, =_nd lanses,
<br />with lensas of irregularly c=_mented ferruginous sanc-
<br />stcne at base, with some leaF imprints on laminaa...... 1
<br />;,-4 Sandstone, light yellowish Bray, medium- to coarse-grained,
<br />slightly argillaceous~ massively beddec to cross-bedded,
<br />with some scattered minor strineers of caul lanses a Few
<br />feet long and a few inches thick,`riable, with abund=_r.t
<br />CarbOnaCeOL'S re51dUe5 On laminae, locally with some leaf
<br />ir.,prints, gradas into unit abov=_ ....................... 9
<br />;E Shale, medium ;ray, only slightly silty, hard, with numerous
<br />subconchoidal fractures, with some limcnitic staining on
<br />fractures, with ccaly specks, with vary hard allipsoidal
<br />1 to Z-Foot ironstone concretions scattered =psrsely along
<br />the wpper con~act, which is an abrupt, channel contaci... 2
<br />7 Shale, as below but with 12ss silt 2
<br />;S Shale, light to medium gray, quita silty, hare, with sub-
<br />conchoidal fractures, weathers light gray with limeni:ic
<br />stains on Bone fractures ................................ _
<br />n
<br />C-12
<br />~ ~, ,
<br />^•~'
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