T’. A. Conrad on American Fossiliferous Strata. 363 
side of the Raritan to have been a wide estuary, although no 
other trace of the rivers on land of this period is known, 
About a quarter of a mile east of this bluff in the suburbs 
of Washington, I observed similar clays at about the same 
level, and in the black stratum, leaves as abundant as it would 
be possible to press them. Lignite is plentiful, and large frag- 
ments of the trunks of trees. The clays around Baltimore 
are supposed, with reason, to be synchronous with the Raritan 
clays, and therefore it is highly probable that the fossil forest 
atthe mouth of the Patapsco, described by Durand, may be 
of the same geological age. 
EKocenz anp Miocene or SHark river, N. J. 
The village of Trap on Shark river shows a good section of 
Eocene greensand, overlaid by about six feet of Miocene mari. 
This ocene is known by the name of Squankum marl, and con- 
tains few organic remains. Prof. Cope has described two species 
of Paleophis ; and a Celorhynchus also occurs init. I have no 
| = doubt that Leidy’s Anchippodus riparius was obtained from it, 
} and that it was an Eocene pachyderm. Equally certain am I 
| that the peccary tooth described by Leidy, found at Shark river, 
} asa Miocene species. It was picked up by Dr. Kneiskern 
at my feet while walking with him over a bed of Miocene marl, 
replete with shark’s teeth, and at some distance from the bluff 
m which it came. The color, mineralization, and degree of 
Corrosion, all agree with the shark’s teeth, and with a cast of 
Volutilithes found on the same spot, and which latter fossil is 
Composed of a light ochreous impure limestone. Prof. Leidy 
ge refer this specimen to his Dicotyles nasutus if it had been 
