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| Unit No. |
Description |
Thickness |
|
|
Matfield Shale
|
|
|
|
Wymore shale member
|
|
|
22
|
Mudstone - light yellowish brown to grayish yellow, very calcareous, wilty, thin-bedded to laminated, medium-hard; contains quartz sand grains, granules of hematite (some limonite alteration), limonite in granular aggregates and pellets, and milky-white replacement silica; fauna sparce and restricted, includes Cornuspira, Hollinella, Cavellina, Paraparchites, Knoxina, Bairdia, and echnoid spines
|
6.4 ft.
|
|
21
|
Shale - dusky green (upper and basal 4 ft.) and dusky red (middle 8 ft.), calcareous, silty, shaly bedded, weathers blocky; limestone bed 0.2-0.5 ft. thick, soft shaly bedded, pale purplish red, 1.5 ft. from base; contains bright orange-red granular limonite aggregates; fossils only in lower 4 ft., Cavellina?, Paraparchites, Microcheilinella?, Macrocypris, Charophyte, oogonia, and gastropods
|
16 ft.
|
|
|
Wreford Limestone
|
|
|
|
Shcroyer Limestone Member
|
|
|
20
|
Limestone - yellow to grayish yellow, weathers yellowish brown, very hard, thick-bedded, moderately algal, very resistant to weathering, somewhat cellular in lower part, very uniform texture, fine-grained matrix; contains Osagia, Ammorvertella, gastropods, ostracodes, and varied fragments
|
1.75 ft.
|
|
19
|
Shale - light yellowish gray, very calcareous, silty, shaly bedded, secondary crystalline calcite aggregates; contains biscuit-like structures believed to be colonial masses of Girvanella, Globivalvulina, Derbyia, Paraparchites, Knoxina?, Cavellina?, Hollinella, Bairdia, Bythocypris, and fragments of echnoids, holothurians, and fish teeth
|
0.25 ft.
|
|
18
|
Limestone - light yellowish gray, weathers brownish yellow, hard, medium-bedded, chert bearing, very uniform texture, limonite-strained fine-grained matrix; contains Ammovertella, fragments of brachiopods, bryozoans, crinoids, echinoids, and sponge spicules
|
1.5 ft.
|
|
17
|
Shale - light yellowish gray, very calcareous, wilty, shaly bedded, many small biscuit-like structures and thin lenses of argillaceous limestone; contains Globivalvulina, Derbyia, Girvanella colonies, Fenestrellina, Penniretepora, Polypora, Dictyoclostus, Septimyalina, Bairdia, Cavellina, Knightina, Kirbya, Kelletina, Knoxina, Paraparchites, Monoceratina, Hollinella, and numerous fragments
|
1.2 ft.
|
|
16
|
Limestone - medium gray, shaly at base, grayish yellow in middle portion, yellowish gray at top, weathers grayish orange; hard, thick-bedded, granular, contains three chert beds, non-uniform texture, subgranular matrix; contains Dictyoclostus, Tetrataxis, Aviculopinna, and numerous varied fragments
|
2.7 ft.
|
|
15
|
Limestone - base yellowish gary and thin-bedded, main part very light gray; weathers grayish yellow, hard, thick-bearing, uniform texture, very fine-grained matrix; sparce fossils, Ammovertella, ostracodes, and fragments
|
2.5 ft.
|
|
14
|
Shale - olive-gray, grading upward to dark gray, then olive-gray, gayish yellow in uppermost part, calcareous, thin lenses of silt throughout, shaly bedded near base, earthy in upper 0.7 ft., large calcareous geodes in upper part; contains Paraparchites, minute vertebrate remains; fossils very sparse
|
3.7 ft.
|
|
13
|
Limestone - mottled medium - and yellowish-gray, weathers grayish-yellow, medium-hard, thick-bedded, uniform texture, fine-grained matrix, mottled by faint inron staining; contains Osagia, Ammovertella, fenestrate bryozoans, and fragments of crinoids and brachiopods
|
2.1 ft.
|
|
12
|
Shale - medium gray, very calcareous, silty, shaly bedded, and fissile; contains Globivalvulina, Ammovertella, Knoxina, Cavellina, Hollinella, Bairdia, Kirkbya, Macrocypris, Paraparchites, and fragments of vertebrates and invertebrates
|
2.5 ft.
|
|
11
|
Limestone - dark yellowish brown, weathers same, medium hard, very argillaceous, thin to medium-bedded, inter-calated thin shaly beds, very uniform texture; contains only fossil fragments
|
2.4 ft.
|
|
10
|
Shale - medium dark gray becoming yellowish brown in upper 2 ft., calcareous, very silty, shaly bedded, smal aggregates of pyrite crystals and of granular limonite; contains Cornuspira, Knoxina, Cavellina, Hollinella, Kirkbya, and fragments, larger fossil very sparse
|
8.0 ft.
|
|
9
|
Limestone - mottled olive and dark gray, weathers to dark gray shale, soft, very argillaceous, shaly bedded, uniform texture, fine-grained matrix; contains Ammodiscus, Aviculopecten, ostracodes, and fragments
|
0.4 ft.
|
|
8
|
Shale - dark gray, weathers yellowish gray at base and yellowish brown at top, calcareous, silty, shaly bedded, thin limestone lenses, sparse siliceous nodules and quartz geodes, aggregates of pyrite crystals and of granular limonite; fossils mostly at base, Tetrataxis, Globivalvulina, Rhombopora, Fenestrellina, Enteletes, Derbyia, Euomphalus, Cavellina, Amphissites, Kirkbya, Bairdia, Cornigella, Knightina, Macrocypris, and many types of fragments
|
2.1 ft.
|
|
|
Threemile Limestone Member
|
|
|
7
|
Limestone - light grayish yellow to light yeloowish gray, weathers same, hard, thick-bedded, chert-bearing; lower 4 ft. is chalky, very porous, scattered solution pits, uniform texture, fine-subgranular matrix; upper 1 ft. not chalky or porous, mottled, uniform texture; contains Ammodiscus, and fragments
|
5.2 ft.
|
|
6
|
Limestone - very light grayish yellow, weathers plae brownish-yellow, medium-hard, thick-bedded, somewhat chalky, very porous, uneven texture, fine-subgranular matrix, two beds of chert; only fossil fragments
|
2.7 ft.
|
|
5
|
Shale and limestone - basal portion shale, light gray, very calcareous, silty, shaly bedded, grades up into very argillaceous limestone which is mottled dark gray and yellowish-gray, weathers light olive gray, and is medium hard and thin-bedded; fossils in shale are Rhombopora, Thamniscus, Fenestrellina, Polypora?, Derbiya, Enteletes, Amphissites, Bairdia, Kelletina, and numerous varied fragments; fossils in limestone are Dictyoclostus, Composita, and fragments
|
0.9 ft.
|
|
4
|
Limestone - pale yellowish gray at base becoming slightly more yellowish gray toward top, weathers moderate yellowish brown, hard, thick-bedded, one chert bed, uneven texture, dominantly fine-grained matrix, pores and fissures filled with crystalline calcite locally give rock a "blotchy" appearance; fossils very sparse and mostly fragmentary, Ammovertella
|
2.8 ft.
|
|
|
Speiser Shale
|
|
|
3
|
Shale - medium gray at base becoming very calcareous laterally, medium gray, very calcareous middle part laterally becomes quite hard, upper part yellowish gray, all silty, shaly bedded; small aggregates of limonite; contains Globivalvulina, Ammovertella, Tetrataxis, Thamniscus, Penniretepora, Rhombopora, Polypora?, Fenestrellina, Septopora, Leioclema?, Derbyia, Composita, Chonetes, Dictyoclostus, Knoxina, Bythocypris, Kirkbya, Cavellina, Knightina, Haworthina?, Bairdia, Silenites, Amphissites, Hollinella, fish teeth, and fragmentary remains
|
2.4 ft.
|
|
2
|
Limestone - yellowsh gray to light brown, weathers yellowish gray, medium-hard, thin to shaly-bedded, conglomeratic, fine-grained matrix, very uniform texture; algal colonies, Nubecularia, Ammovertella, Aviculopecten, ostracodes, and assorted fragments
|
0.6 ft.
|
|
1
|
Shale and mudstone - dark greenish gray; dusky red, green, and purple; grayish green and olive gray in ascending order, colors gradational and intermixed locally, very silty, calcareous, shaly bedded, weathers blocky; contains Bairdia, Silenites?, Bythocypris, Macrocypris?
|
0.6 ft.
|
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