56 HOLLICK. 



collecting, if possible, further material representing the Creta- 

 ceous (Amboy clay) formation, of which I had obtained indica- 

 tions at the time of my previous visit. 



Three weeks were spent there, during which period the en- 

 tire coast line and most of the interior was subjected to critical 

 examination, with the result that several facts not before recorded 

 were noted, and a considerable amount of interesting material 

 was collected. During part of the time I was accompanied by 

 Dr. Lester F. Ward, of the United States Geological Survey. 



In order that the general configuration of the island and the 

 several localities mentioned may be understood, I have included 

 a map of the island, prepared from that issued by the United 

 States Geological Survey^ (see plate II). 



Pal.^obotany. 



One of the most important problems which it was necessary 

 to solve was whether the Amboy Clay Series was represented 

 on the island. Theoretically these clays, which had been pre- 

 viously traced from New Jersey, through Staten Island and 

 Long Island, to Martha's Vineyard, ought to occur also on 

 Block Island and previous observations strongly indicated that 

 such was the fact. Definite evidence, however, was lacking and 

 it was recognized that if a few well-defined and typical species 

 of fossil leaves could be found the question would be settled. 

 Careful and systematic search was therefore made for such evi- 

 dence, and the result was entirely satisfactory. The material 

 collected was identical in its character and occurrence with that 

 from the other islands mentioned, consisting of ferruginous clay 

 nodules or fragments, containing organic remains, scattered 

 through the Drift, mostly in close proximity to two of the clay- 

 exposures, at Clay Head and Black Rock Point. 



About twenty-five specimens of fossil leaves and fruit capable 

 of identification were found, representing fifteen species, all of 

 them Cretaceous in age, and at least nine of them typical of the 

 Amboy clay flora. 



Following is the list : 



1 Rhode Island, Block Island Sheet, 1889. 



