R. P. Stevens on the Coal Measures of Ohio and Iinois: 75 
generally found would forbid it. Sigillarie and Stigmarie are 
com 
In the limestone No. 1 of the Ohio section, over the second 
bed of coal, in the state of uh the Chonetes ‘mesoloba and oom 
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At the mouth of Big Yellow Creek they are seen in the upper 
limestone above all the coal strata. These fossils are found in a 
limestone between the third. and fourth seams args coal at Dan- 
ville, Ill., and range through the entire series of the Vermillion — 
Co. coal. At LaSalle they are seen in the marble limestone, 
again at Peru, and range upwards through the series. At Cen- 
tralia the C. mesoloba is seen in the upper shales of the coal 
measures. In Tidiana (New Harmony, N. and P.) they occur 
in the middle of the series. 
The iavetnen and calcareous shales and clays of both States 
are highly prolific in marine exuvie. Dr. Newberry says he 
found in the limestone over the third bed of coal of Mahoning - 
Co. the following genera, viz., Spirifer, Terebratula, Pleuroto- 
maria, Goniatites, Bellerophon, Loxonema, Productus, Macro- 
cheilus, and adds, ‘nearly all the genera of Carboniferous fos- 
sils.” On Yellow Creek, O., the number of genera increases in 
any given strata as we progress upwards to the limestone which 
lie between the upper and lower coal series of the Appalachian 
* 
system; while in the western part of Ohio the genera are about — 
equally numerous throughout the whole series. This may be 
explained by the well known fact of the greater number and 
thickness of the calcareous strata of the western part of these 
coal-fields. 
In the Carboniferous strata of both States, the followin spe- 
cies have been identified, viz., Spirder Kentuekensis, S. Forbeseyi, 
S. cameratus, S. lineatus, Terebratula subtilita, T. elongata, Sg 
* On the north and estate re edge vt ee gpa coal-fields this age 
pie is often a — e and is liable n for formation No. x1, 
true basal coal rangionjaiads one istakiog: i i ‘some ee ts have fallen 
cesta Solin’ Wtely publiahed ef the MeKean Co: Pa, beds o 
Rem Sane ed ee I draw, ¥ix:, OF the lower 
animal never does, is 
conglomerate fossils, 
cient at all times to distinguish the two. Moreover, ‘the ah conglomerate usually 
exhi ded, whi the lower all traces 
of carbon ar are bea And again, the lower conglomerate, i ~ the lower i 
contain ts of Devonian rocks, or in = even of Silurian, while the up» __ 
Searels of purely siliceous and Carboniferous materials. ie 
i 
