18 
(20) A series of grey limestone beds, alternately coarse and fine-grained, 
mostly coarse and chert free 240 feet 
In greater detail, from above downward: 
(a) Coarse grained; no chert 25 feet 
(b) Coarse grained. The base with scattered lenses of chert, varying from 
1 to 10 feet in length, with a maximum thickness of 3 inches 2*5 feet 
(c) Fine grained, with some chert nodules 2*5 feet 
(d) Coarse grained, with scattered chert nodules. In this bed, as in the 
coarse-grained beds above noted, the chert masses are thicker in pro- 
portion to their length and not so elongate with the bed 17 feet 
(e ) Medium to fine grained, with a considerable number of scattered chert 
concretions. In all the finer-grained beds the chert is in smaller particles 
or in thin elongate bands with the bed 17 feet 
(f) Coarse grained, with the exception of a few thin bands above 45 feet 
(g ) Very coarse grained, weathering pockety 8 feet 
(h ) Coarse grained, the lowest beds very dark, almost black 123 feet 
Lower Mississippian 
(21) A succession of dark grey, coarse to fine-grained, limestones, sub- 
divided from above downward, thus: 175 feet 
(a) Coarse to medium grained 85 feet 
(b) Fine grained, weathering brown 18 feet 
(c) Lighter grey, coarse grained 23 feet 
(d) Fine grained, weathering brown 11 feet 
(e) Lighter grey, coarse-grained limestone 38 feet 
(22) In the upper 61 feet a very dark, fine-grained limestone, weathering 
brownish. This is underlain by 5 feet of a more coarse-grained rock weathering 
light grey, containing many fossils, and beneath this is a 2-foot bed of fine-grained 
limestone which shales prominently across the bedding. This locality is well 
exposed on the first ridge that the trail crosses as it passes northeastward from 
the western edge of the lake 13-5 feet 
(23) Dark grey, coarse-grained limestone above, grading into a fine-grained 
rock below, the latter containing black chert nodules. The entire locality is 
fossiliferous, the coarse-pained rock being especially rich in fossils. This is 
exposed upon the same ridge with locality 22 20 feet 
(24) An alternation of coarse- and fine-grained limestones, the latter con- 
taining black chert nodules. This locality, weathering more rapidly than the 
beds immediately above and below, forms a depression; it enters the lake as a 
gully upon the middle of the ridge noted above in localities 22 and 23 25 feet 
(25) Alternating beds of fine- and coarse-grained limestone, with black chert 
nodules. The upper part contains many well-preserved fossils. This begins at 
the eastern slope of the gully noted above; the eastern slope of the gully is a good 
place for collecting 20 feet 
(26) Rock similar to that of the last locality. This forms a rather prominent 
cliff, due to the pronounced shaling across the bedding plane developed in the 
very dark grey lower beds. This locality begins at the highest point on the trail as 
it crosses the ridge noted in locality 22 50 feet 
Fossils are rare throughout the beds. 
(27) A dark grey, mostly fine-grained limestone, bearing black chert. The 
chert usually occupies shale bands and is so abundantly developed here that the 
shale is very unevenly bedded and often occurs merely in pockets of the chert .... 35 feet 
Fossils few. 
(28) Medium to fine-grained, black, chert-bearing, thin-bedded limestones 25 feet 
Fossils few. 
(29) A fine to coarse-grained limestone, mostly the former. Black chert is 
abundant, and though in separate concretions these are so numerous as to form 
almost continuous beds, from 1 to 3 inches thick and from a few inches to several 
feet apart. About half the beds fracture prominently across the bedding plane 
and these are well supplied with chert 50 feet 
