-1897.] 



NEW YORK ACADEMY OF SCIENCES. 



125 



In other words, the exposure in question is the equivalent of 

 the clay marl in the marine division of White, the Mattewan of 

 Clark, and is next above the Island Series (upper Albirupean §) 

 as determined by Ward, which latter he considers to be the 

 equivalent of the Amboy clays. 



The locality was first visited by me in 1890, but on that occa- 

 sion little of importance was found. In 1894 it was explored, in 

 company with Dr. N. L. Britton and Professor Lester F. Ward, 

 of the United States Geological Survey, when considerable ma- 

 terial was collected. During the past summer Dr. Britton and I 

 made a special trip and spent two days there, securing a number 

 of specimens, and subsequently, on November 7th, after a heavy 

 storm and unusually high tide, I made a final examination of the 

 blufi" and coUected'some of the best material yet brought to light. 



♦"Correlation Papers— Cretaceous." Bull. No. 82, U. S. Geol. Surv. (1891) 79. 

 t" Cretaceous Deposits of the Northern Half of the Atlantic Coastal Plain.'" B 

 )1. Soc. Am. vi. (1894) 479-482 ; " Origin and Classification of the Greensands of > 



Bull. 

 New 



Geol 



Jersey." Journ. Geol. ii. (1894) 161-1 . 



t "The Potomac Formation." 15th Ann. Rept. U. S. Geol. Surv. (1895) 307-39/. 



3 Name first used by P. R. Uhler, "The Albirupean Formation and its nearest rela- 

 tives in Maryland." Proc. Am. Phil. Soc. XXV. (January G, 18.88) 42. 



