FORMATIONS OF DEVONIAN AGE. 99 
and this fauna from New Jersey is close, the one species, Orbiculoidea 
gervensis, which is pre-eminently the most conspicuous member of 
the fauna in New Jersey, has not been recognized by Clarke from 
Becraft mountain. 
The Smrifer murchisoni Zone. 
The larger proportion of the Oriskany beds in New Jersey bears 
the fauna which is chiefly characterized by Spirifer murchisoni, a 
species which is also present in the earlier Oriskany faunas, but which 
only attains a conspicuous position in the fauna of these higher beds. 
The strata containing this fauna are, for the most part, siliceous lime- 
stones, not especially different from those which bear the Orbiculoidea 
jervensis fauna, but the fauna itself resembles that of the arenaceous, 
Oriskany beds of New York more closely than the calcareous facies 
of Becraft mountain. In the southern portion of the Delaware valley 
region of New Jersey the upper portion of these siliceous limestones 
is replaced by sandstone, which does not essentially differ, in its 
lithologic characters, from the typical Oriskany sandstone of New 
York, and yet, so far as has been observed in this State, there is no 
essential change in the fauna of these sandstone beds from that of 
the calcareous beds immediately beneath. The fauna differs in some 
respects from that of the typical Oriskany sandstone of New York, 
one of the most conspicuous differences being in the rarity of Spirifer 
arenosus, Which, in New York, is abundantly represented in the 
Oriskany sandstone. In these New Jersey beds fragments of trilo- 
bites may usually be detected, as well as an occasional coral, these 
being fossils which are among the rarest forms in the New York 
Oriskany sandstone. 
Locality 3 A.—In the Nearpass section the beds bearing the Spirifer 
murchisont fauna may be best studied on the Werden farm, north of 
the Sanford Nearpass place. The beds at this locality are a north- 
ward extension of 2 A**, which is too much drift covered to offer an 
opportunity for making collections. The following species have been 
identified : 
. Stropheodonta magnifica Hall. 
. Camarotechia barrandu (Hall). 
. Hatonia peculiaris (Con.). 
. Spirifer murchisoni Castel. 
. Cyrtina varia Clarke. 
Or BH © ~w HR 
