ADDITIONAL OBSERVATIONS. 



place it is indurated, being a coarse grained sandstone, re- 

 plete with Gryphsea mutabilis, Ostrea falcata, and other 

 characteristic fossils ; remains of a Linnsean Cancer and 

 casts of Alcyonia are remarkably abundant. This rock« 

 forms the bed of the small creek at the village of Tinton, 

 and, terminating abruptly on the west, affords a fall of 

 sixteen feet ; the whole elevation is twenty-seven feet. 

 Three strata are observed in a section of the rock, with 

 no difference in their fossil remains ; but the intermediate 

 stratum is not so highly charged with oxide of iron, and 

 is less indurated than the others. Six miles from Tinton, 

 and within three miles of Long Branch, Mr. Conrad dis- 

 covered casts of a group of a shells which fully prove the 

 deposit to be a green sand of the Eocene period. He 

 has also discovered a siliceous rock of the same age, a few 

 miles south-east of Salem, on which a thin bed of Miocene 

 marl reposes. 



VI. 



In addition to the species which have been given in 

 the table as common to the Upper division of the Creta- 

 ceous series and the Eocene, we have lately observed the 

 Pecten Poulsoni from the latter formation, at the Wal- 

 nut Hills, Miss. Mr. Conrad detected the Gryphxa 

 vomer in the Eocene at Upper Marlborough and Piscata- 

 way, Md. 



