166 F, B. Meek on the Carboniferous Rocks of — 
linked together by their organic remains, Starting from Leaver 
worth City on the Missouri, where the same Coal-measure rocks 
which Mr. Marcou will insist belong, in Iowa, Missouri and Ilr 
nois, to the Mountain Limestone, occur characterized by such 
with, with the exception of the ubiquitous Spirigera sublilila, 
a shell that could not be distinguished from it. (See this Jour 
nal, [2], xxvii, 424, 1859; Proveed. Acad. Nat. Sci. Philad, 
1859, p. 8; D. 
112, &c.) 
That beds of coal occur in the lower part of the Mil es 
it in Pennsylvania, Western Virginia, portions of Kent by 
e rk i 
Mess » Hull & Green, Quart. Jour. Geol. Soc., Lond., Mat 7. 1. 
p. 246)—while in the western part of Arkansas a great 
ness of shale, sandstone, &c., above the conglomerate, 18 ® 
* A consi : é : : sneluded by +h. 
PS cs, eee Arena of these intermediate rocks were Inc’ fied 
intermedia 
bel, te series a 
ow. : 3 : Pi 4 
Fermae ° ¢ Didi lan above, though, that it might be convenient to 
