190 J. Hail on Carboniferous Limestones of Mississippi Valley. 
The encrinital limestone of Burlington, or, as we shall hereafter 
term it, the Burlington limestone, is characterized by its 
numbers of crinoids, of which Drs. D. D. Owen and B. F. Shu- 
mard have described numerous species. The rock is in a great 
asure composed of the broken and comminuted remains of 
this family of fossils: large masses of the rock consist almost 
entirely of the separated but unbroken joints of the columns of 
various species. 
This rock includes the “ Encrinital group of Burlington,” and 
the “ Reddish brown Encrinital group of Hannibal,” in Missouri 
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cherty beds which separate it from the Burlington limestone. 
This limestone which may for convenience be termed the 
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cedony, cale spar, ete. which it contains, and which have bee 
distributed very ‘widely throughout the United States. 
a 
: 5! hehy > 
* See ob a tecioi’ Becsetella: following thaeareae 
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