60 Review of the New York Geological Reports. 
the middle part of the Pentamerus limestone, according to that 
author, whilst the Asterocrinites pachydactylus, fig. 6, p. 346, of 
the same report, is confined to the base of this limestone. 
The other fossils named and described found in this formation, 
are, Strophomena raristriata, N. rectilateris, S. depressa, S. elon- 
gata, Avicula naviformis, A. manticula. “It also contains, ac- 
cording to Vanuxem, two atrype of a kind which first appear in this 
district and State in this rock, and there are three in all. Beyond 
this State there are others, one of which, being A. capar of Con- 
RAD, exists in a lower position in Ohio and Indiana; the third, A 
cuboides, is confined to the Tully limestone. The two found 
in the Pentamerus limestone closely resemble the Terebratula 
Wilsoni of English geologists.” Nothing has yet been identified 
in the West, corresponding to this Pentamerus limestone. 
Catskill Shaly Limestone, (Delthyris Shaly Limestone, and 
Scutella Limestone of the yearly reports.) _ (Part of No. 6 of Penn- 
sylvania survey. )—This is one of the thickest members of the 
Helderberg series, and ranges all through the southern counties, 
extending as far west as the east end of Madison County. It is 
composed of “a dark bluish grey shale, with a fine grained blue 
limestone beneath, and a coarse limestone above ;” the latter con- 
taining a great number of a discoidal-shaped fossil, probably the 
pelvis of an E'ncrinite, which bears a resemblance to a Scutella ; 
hence has arisen the term, “ Scutedla limestone,” as applied to the 
upper division of this Jornatiodl “ Sparry Limoprons? 4 is a syno- 
nym employed by Grsxarp to designate the same rock. In the 
first or southern geological district, where this group is upwards 
of a hundred feet thick, three divisions have been recognized. 
a. An upper, coarse, uncrystalline limestone, containing a great 
many shells and ierrsntion along with some — 
shaly limestone.* 
b. A middle slaty limestone equally fossiliferous. 
ce. A lower slaty argillo-siliceous limestone, abounding in Stro- 
phomena rugosa,t fig. 2, p. 312 of Vol. xvi, of this Journal. 
"The whole comprises, according to Marner, a series of strata, 
perhaps, more highly fossiliferous than any rock of equal thick- 
——— 
* In Hatu’s report this division is described as a distinct formation under the 
name of “ Encrinital limestone 
. "+ Since the former number of the Review was written, we have seen specimens 
Me of this fossil. ee is much larger and more strongly wrinkled than the western fos- 
‘sil there spoken 
