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52 Bulletin of Wisconsin Natural History Society. Vol. 1, No. 1, ■ 
of single valves, and are so numerous that it may properly be called ; 
the lower Stropheodonta layer. The plant remains are always in a | 
carbonized form and may be considered in a good state of pres- \ 
ervation. | 
Number four is 28 inches in thickness, it is not as hard as the ^ 
preceding layers, although it is more compact and not as granular ; \ 
it carries casts of single valves of several genera of Bracliiopods, 
and is the one layer in which the greatest number of specimens .: 
and variety of species of fish remains have been found, these being 
always in the form of the exterior bony plates of the teeth and are 
generally well preserved, although much broken up, the effect ■ 
of the high explosives used in quarrying. These remains are not j 
confined to this layer but have been found in all of the layers of 
the formations above, but as yet not observed below it. j 
Overlying number four is found a layer about three inches \ 
thick of a semi-hard clay ; when first broken into it is compact and 
firm, but on a limited exposure it readily disintegrates, assumes j 
rather a shaly character, and quickly becomes an impure clay. j 
This layer contains a few organic remains of the same species as i 
are found throughout the group, generally those of Brachiopods. \ 
Number five is 28 inches in thickness, it is rather soft and has 
much the same character as number four ; it carries only a few j 
fossils, generally Brachiopods, not dift"ering from the layers below. 
Number six is 18 inches thick, not very hard, differing very 
little, if any, from number five, and has but few fossils. \ 
Number seven is 18 inches in thickness and is an exact counter- \ 
part of number six in its character and organic contents. I 
Above number seven is found a five-inch layer of semi-hard 
clay, having all of the characters of that found above number four. ; 
Number eight is 20 inches thick, a little harder than any of the ■ 
layers below as more or less well defined crystals of calcite begin 
to appear ; in its organic remains it is almost a counterpart of num- 1 
ber three, and were it not that fossils of the genus Stropheodonta \ 
are fairly common in some of the upper layers it could very prop- \ 
erly be termed the upper Stropheodonta layer, fossils of but few 1 
other forms are found in it. 1 
Number nine, one of the heavy layers of the group, is 21 inches ! 
thick, slightly harder than number eight, and a little more granu- j 
lar. The fossils begin to assume the form of internal casts, while \ 
the variety becomes larger but still not numerous in specimens, 
and a few forms not observed in the lower layers begin to appear. \ 
Number ten is about 12 inches thick: it is much harder than \ 
number nine having more calcite and iron pyrite, the fossils are 
more numerous in specimens with a slight increase in species. • 
