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12. Heavy bedded, blue limestone, one to seven feet in the 
thickness of the layers, cherty and calcite veined as well as con- 
taining large crystals of calcite. Master joints. Weathers rusty 
and deep, showing the weathering to a depth of forty feet. Fos- 
siliferous. Bryozoans are the most abundant, but horn corals, 
crinoids, cephalopods, and brachiopods in several species occur. 
89 feet. 
13. Coarsely crystalline, mostly thin bedded, steel gray to 
blue limestone, with several thin shale partings. Very fossi- 
liferous — especially towards the bottom, much as in No. 12. 
Thicker bedded toward the top, with calcite veins becoming 
abundant; no chert. 16 feet. 
14. Shaly, steel gray limestone and calcareous shales, thin 
bedded. Very fossiliferous but fossils very much broken up. 
2 feet. 
15. One solid layer of dark blue, crystalline limestone, 
strongly calcite veined and carrying many broken and mashed 
fossils. 2 feet. 
16. Thin bedded limestone, more or less argillaceous, with 
shale layers. The limestone is crystalline and very fossiliferous, 
especially near the base. Beds are for the most part under four 
inches in thickness. There is very little chert or calcite, and only 
a few joints. 20 feet. 
17. Heavy bedded, dark steel gray limestone. Coarse and 
fine grained in different layers. Very much mottled with small 
clay lenses and streaks. Calcite veins occur complexly branching 
as well as chert nodules which are often cut by these veins. 
There are two joint systems at right angles to the bedding plane. 
Weathers with less rounding than the ordinary Chickamauga. 
Tetradium remains rather abundant. Beds 3-8 feet thick. Would 
quarry well. 50 feet. 
18. Thin bedded, fine grained, cherty limestone, gray to black 
in color. There are many thin clay partings and beds or layers 
of chert nodules are characteristic. There are a few calcite veins. 
Weathers light. Fossils are rare. 20 feet. 
19. A partly covered interval. Light to, dark grayish blue 
limestone which is medium to thin bedded. Calcite veins and 
black chert nodules in layers. Bryozoans found. 105 feet. 
20. Argillaceous limestone, showing thin beds grouped into 
layers of two to eight inches. The layers are alternately clay and 
