FORMATIONS OF SILURIAN AGE. 69° 
Tn this list characteristic species from both the Ptilodictya frondosa 
zone and the Atrypa? lamellata zone are recorded, but they are not 
mingled in the same beds. 'The two zones are just as distinctly sepa- 
rated here as in the Nearpass section. Masses of the red limestone, 
with its typical Ptilodictya frondosa, are scattered about, but most 
of the loose material, as well as the ledges in situ, evidently belong 
to beds higher than the red limestone, in the Atrypa? lamellata zone. 
No evidence of the presence of the Chonetes jerseyensis fauna has 
been detected, and the lower beds of the formation bearing this fauna 
are doubtless more deeply drift covered than the others. 
Locality 25 B.—In the fields one-half mile southwest of Haines- 
ville many of the Silurian and Devonian formations are more or 
less well exposed. ‘Towards the east the beds of the Poxino Island 
shale have been excavated for road material; west of the exposure 
of this formation comes a ridge of Bossardville limestone, and beyond 
that are exposures of the Decker Ferry formation. From a brownish 
sandstone, near the base of the formation at this locality, the follow- 
ing species were collected: 
1. Monotrypa corrugata n. sp. 
. Stropheodonta bipartita (Hall). 
. Orthothetes deckerensis n. sp. 
. Chonetes jerseyensis Weller. 
. Rhynchonella agglomerata n. sp. 
. Atrypa reticularis (Linn.). 
. Reticularia bicostata (Van.). 
8. Dalmanites sp. undet. 
This fauna is characteristically that of the Chonetes jerseyensis 
zone, as might be expected from its low position in the formation. 
No collections from the other portions of the formation have been 
made at this locality, but scattered over the surface on the summit 
of a low hill, the coralline bed was observed with an abundance of 
weathered coral masses of the same species as those in the Nearpass 
section. A careful study of the locality would undoubtedly furnish 
an abundance of excellent Decker Ferry fossils. 
Locality 52 A.—In a bluff east of the road to Flatbrookville, and 
about one and three-fourths miles below Peter’s Valley, the Decker 
Ferry formation is exposed through a thickness of more than cighty 
feet, although the base of the formation is covered. The major por- 
tion of the beds at this locality are sandstones, but interstratified 
with the arenaceous beds there are occasionally thin bands of lime- 
Ct He GO 
=p) 
