328 
HUBBARD AND CRONEIS 
36. Blue, finely crystalline to felsitic limestone becoming 
lighter and more felsitic toward the top. Crystals of calcite 
throughout the entire section. The chert is not noticeable above 
the first ten feet. In this section, the rock is broken by the 
growth of concretions, giving a brecciated appearance and con- 
torted beds. There are good dip joints, others are irregular 
and at various angles. Many of the layers are sandy. Pyrite, 
limonite, and siderite show on the surface. Weathers dark and 
differentially, emphasizing the chert in relief, and the calcite 
along bedding planes in depressions. Beds vary from one to two 
feet in thickness but there is one single bed of six feet. 
53 feet. 
37. Dark gray crystalline limestone which is nearly pure in 
beds which are for the most part four to twelve inches in thick- 
ness, but there is one bed of four feet near the bottom. There 
are bunches of calcite crystals in the thick layer and there are 
two chert layers, one at the top and the other three feet below. 
The upper one is of neat rounded concretions with concentric 
structure. Rock has conchoidal fracture. Weathers buff to 
brown with large curved surfaces. 12 feet. 
Nos. 37 and 38 are found both on wagon and R. R. cuts. 
38. Light and dark gray felsitic limestone which looks flinty. 
Conchoidal fracture. At the middle, there are two layers with 
pits and knobs which fit together like waffle irons. There is a 
little black shale along this bedding plane. Chert layers at the 
base. Weathers dirty buff to brown. 12 feet. 
No. 38-44 are all found on Virginian railroad cut. 
39. Dark blue, medium bedded crystalline limestone with 
some calcite veins. There are several shale partings near the 
top. Red threads occur in the blue limestone. Dip joints are 
the most pronounced but there are some others present. Near 
the base there is one arenaceous blue layer. Weathers a dirty 
brown with the veins weathering in. 25 feet. 
40. Lower mottled layer with light and dark gray in bars 
and blotches. Fine grained and crystalline with calcite bunches 
showing clearly. The layers are six to twenty-six inches in 
thickness, with three small shale partings. No conchoidal frac- 
ture. Weathers a darker reddish brown. 10 feet. 
41. Lower light steel gray layer of fine grained crystalline 
limestone. Fracture slightly conchoidal. Beds are from 6 to 15 
