LETTER OF TRANSMITTAL. 



Geological Survey of New Jersey, 



New Brunswick^ N. J"., April 16, 1884. 

 Sir: I have the honor herewith to transfer to you the text and draw- 



ft/ 



ings of the Fossil Brachiopoda and Lamellibranchiata of the Raritan Clays 

 and Greensand Marls of New Jersey. ^ They have been prepared by Prof 

 Robert P. Whitfield for the Geological Survey of that State. While the 

 fossils here described have come from a Hmited district of the United States, 

 it is a district which drew the attention of paleontologists earher, and has 

 been studied longer, than any other, so that it is classic and typical ground 

 for all American geologists. As such we esteem it worth}- of a place among 

 the Monographs of the United States Geological Survey, and with high appre- 

 ciation leave it in your charge for pubhcation and general distribution. 

 I also here append a 



SKETCH OF THE GEOLOGY OF THE CRETACEOUS AIS^H TERTIARY 



FORMATIONS OF ISTEW JERSEY. 



The invertebrate fossils described in this and the succeeding volumes 

 have been found in the geological formations which make up the southern 

 half of New Jersey. The northwestern boundary of these formations may 

 be traced by a line drawn in a southwesterly direction from Staten Island 

 Sound, on the eastern border of the State, to the Delaware River at the 

 mouth of Assanpink Creek, in Trenton, on the western side. The other 

 boundaries are the Atlantic Ocean and Delaware Bay and River. The 

 boundaries, except the first, need no more specific description. The north- 

 western boundary can be traced with a good deal of accuracy from the 



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