REPORT OF THE DIRECTOR I9II 2g 



of Woodcock Hill. With g^erhaps the exception of several small 

 areas east of Oxford Depot these conglomerates are without ques- 

 tion parts of one formation, their separation being due to the numer- 

 ous faults which have affected this portion of the area. Although 

 no fossils have been found in them they have been correlated by 

 several writers with the conglomerate at the north end of Pea Hill 

 near Cornwall and assigned to the Oriskany. Lithologically they 

 resemble the lighter colored phases of the Shawangunk (Green 

 Pond) conglomerate much more than they do the conglomerate at 

 Pea Hill, in that they are coarser, denser and less frequently present 

 the open texture which often characterizes the latter. Where best 

 developed they greatly exceed it in thickness. Moreover recent road 

 excavations have at several points revealed the presence of the 

 Longwood shales which normally overlie the Shawangunk (Green 

 Pond) conglomerate, in close proximity to and above these con- 

 glomerates. It seems therefore, necessary to correlate them with 

 the Shawangunk (Green Pond) conglomerate, and not with the 

 conglomerate at Pea Hill. As already pointed out, the latter is to be 

 correlated with the Kanouse (Newfoundland) grit of the New 

 Jersey area and is Onondagan and not Oriskany in age. 



Manhattan and Staten Island. Pursuing a definite plan for the 

 acquisition of all new data relating to the geology of New York 

 City, Doctors Kemp and Berkey have brought together details 

 exposed in the course of municipal and private construction under- 

 takings, and Doctor Hollick has continued his records relating to 

 the special geologic features of Staten Island. 



Long Island. Professor W. O. Crosby's report on the general 

 geology of Long Island, will, it is believed, be soon in readiness for 

 publication. 



SURFICTAL GEOLOGY 

 The study of the origin and history of the surface deposits in 

 the Schenectady region has been carried forward to completion by 

 Dr J. H. Stoller and his report is now in press. Over about one-half 

 of the area of the Schenectady quadrangle the deposits were made 

 in the glacial lake known as Lake Albany. These deposits consist 

 in general of an underlying bed of evenly stratified dark clays grad- 

 ing into overlying sands. They are well exhibited in the vicinity of 

 Schenectady where the Mohawk river has cut into the mass, forming 

 a crescentic bluff in which a thickness of about one hundred feet of 

 clay covered by some fifty feet of sand is exposed. This mass is 

 a portion of the extensive delta deposit which stretches southeast- 



