FORMATIONS OF SILURIAN AGE. 
2 A*8. Hard, bluish-black limestone, similar to 2 A®?. 
b) b) 
it 
2 A**, Hard, 
Leperditia alta (Con.). 
bluish-black, semi-crystalline lmestone, 
with many fossils. 
op) 
~ 
— 
10?) 
He 09 2 Et G 
Or 
~)AG®. “Hard: 
Stropheodonta varistriata (Con.). 
Spirifer vanuxemi Hall. 
Megambomea aviculoidea Hall. 
Holopea antiqua (Van.). 
Tentaculites gyracanthus (Katon). 
Undetermined cephalopod. 
Leperditia alta (Con.). 
Beyrichia ktummeli n. sp. 
nearly black lmestone, with bands of fos- 
Stropheodonta varistriata (Con.). 
Centronella? biplicata n. sp. 
Sprifer vanuxemr Hall. 
Undetermined pelecypod. 
Beyrichia smochi n. sp. 
fine-grained, knotty, blue hmestone, with 
some bands of fossils. 
Stropheodonta varistriata (Con.). 
Rhynchonella sp. undet. 
Centronella? biplicata n. sp. 
Spirifer vanuxemt Hall. 
Undetermined gastropod. 
Orthoceras sp. undet. 
. Beyrichia montiguensis ni. sp. 
] 
Tee Gy, abo, 
5) ane 
TEIEA toy, Tne 
No collections of fossils have been made from the Manlius lme- 
stone at other localities, but the same species, especially Spirifer 
vanucemt, Stropheodonia varistriata and Leperditia alta, have fre- 
quently been observed elsewhere. 
In a former preliminary report on 
the faunas of the Wallpack ridge* the Manlius limestone was asso- 
ciated with the superjacent Helderbergian formations rather than 
with the subjacent formations, but the transition from the Rondout 
to the Manlius is so gradual, both stratigraphically and faunally, that 
it has proved to be difficult to draw a sharp dividine line at this 
horizon. 
* Ann. Rep. N. J. State Geol. for 1899. 
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