FORMATIONS OF SILURIAN AGE. 63 
preserved. Near the lime-kiln at Flatbrookville, in a bed a fraction of 
an inch in thickness, at the very base of the formation, there are 
numerous specimens of a species of Leperditia, which has been de- 
scribed in the present report as L. altoides n. sp. This thin bed 
may be considered as lying at the contact of the Decker Ferry for- 
mation with the Bossardville limestone. In lithologic character it 
resembles the underlying beds, but is darker colored. It is followed 
for a few inches by an alternation of fine-grained limestone and more 
coarsely-grained, crystalline limestone, in layers less than an inch 
in thickness, the more crystalline layers containing the typical fossils 
of the higher Decker Ferry beds. 
The only complete exposure of the entire formation is in the Near- 
pass quarry bluff, and the Decker Ferry section at this locality, with 
its succession of fossil faunas, will be first described, after which 
the faunas of the formation from other localities will be discussed. 
Locality 2 A.—William Nearpass quarry, two miles south of Tri- 
States, New York. 
2 A*. Highly fossiliferous, earthy, somewhat arenaceous 
limestone, resting upon the Bossardville lime- 
stone. 2) tte 
Zaphrentis sp. undet. 
Monotrypa corrugata n. sp. 
Pholidops ovata Hall. 
Stropheodonta bipartita (Hall). 
Orthothetes deckerensis n. sp. 
Chonetes jerseyensis Weller. 
H 02 *~ b+ 
U 
. 
Dalmanella postelegantula n. sp. 
Rhynchonella deckerensis n. sp. 
Rhynchonella agglomerata n. sp. 
(Co) C3 top) 
(fs) 
Atrypa reticularis (Linn.). 
Reticularia bicostata (Van.). 
. Edmondia? deckerensis . sp. 
. Pterinea sp. undet. 
pe ps ps 
wo ue © 
tpt 
H= 9 
. Ptychopteria? subquadrata n. sp. 
kr} 
Or 
5. Mytilarca obliqua n. sp. 
Gontophora sp. undet. 
Straparollus sp. undet. 
18. Loxonema sp. undet. 
19. Orthoceras sp. undet. 
20. Proetus? depressus n. sp. 
jt 
(ep) 
= 
