1889. | NEW YORK ACADEMY OF SCIENCES, 181 
length. At other places it is found as a mere amorphous and 
very hard mass. At certain points, as on Grimes Hill, back of 
Stapleton, it outcrops in place, but the glacier has scattered 
much of it far and wide. The limonite deposits all contain a 
considerable amount of it, and it is one of the features which 
call for a (at least) partially aqueous origin of the iron ores. I 
have nowhere observed it in greater thickness than three or four 
feet. In referring this substance to the Quaternary, I believe we 
have more nearly reached its actual horizon than either of the 
hypotheses above mentioned. 
Boulder Clay at Arrochar, Staten Island. 
A brick-yard has recently been established near the termi- 
nation of the South Beach branch of the Staten Island Rapid 
Transit Railroad, on an outcropping layer of boulder clay. 
Extensive beds of morainal sand are associated with the clay. 
Pror. D. S. Martin remarked upon several points in the 
paper, expressing great interest in the facts presented by Dr. 
BRITTON, and welcoming especially the strong additional evi- 
dence given as to the Cretaceous age of the clays and gravels be- 
neath the drift on the northern shore of Long Island. In refer- 
ence to the term ‘‘jasperoid,” he corroborated the statement 
made on the authority of Mr. Russell, and said that he was him- 
self present at the meeting of the Academy (then the Lyceum) 
when Prof. Wurtz had discussed the rocks opposite the city, at 
Hoboken and Bergen, and had applied that name to this peculiar 
bed. He expressed much interest in Dr. Brirron’s correlation 
of it with the silicious and ferruginous deposits on Staten 
Island, and gave some further account of its mode of occurrence 
at Hoboken, where one or two outcrops now remain to be seen. 
THE PRESIDENT followed in a similar strain of interest and 
appreciation. He spoke of the long-disputed problems as to the 
age of the northern Long Island beds, and the gradual accumu- 
lation of scattered evidence that has now become cumulative, as 
- to their Cretaceous character. The paper just read may well be 
regarded as one of great value in local geological study. 
Dr. A. A. JULIEN, as the second paper of the evening, read 
a letter from Dr. H. CARRINGTON BOLTON, dated April 10th, at 
Cairo, Egypt, upon 
