18 90.] XEW YORK ACADEMY OF SCIEXCES. 85 



Mr. Merrill's paper was discussed with much interest by the 

 President, Dr. Brittox, and Prof. Martik. 



The value of the suggestions presented, and the care shown 

 in all Mr. Merrill's work, were highly appreciated; although 

 some question was expressed as to the possibility of a post-Trias- 

 sic submergence of the whole coast region up to the base of the 

 Highlands, such as would be implied by Prof. Davis's view 

 cited at the opening of the paper. Some deposits ought to re- 

 main over such an area of submergence, unless indeed its dura- 

 tion had been exceedingly brief. 



Prof. Martin called attention to the presence of a small area 

 of isolated clays lying upon the Trias within the general line 

 of contact between that and the Cretaceous, a little northwest 

 from Monmouth Junction (Pennsylvania E. P.). These were 

 held to be Cretaceous by the late Prof. Cook, from whom he 

 had received the account of them, only a few months ago; and 

 if so, they would indicate an extension of that formation quite 

 beyond our usual estimates. 



Dr. Bkittox held that the Cretaceous age of this deposit 

 had not yet been fully established. 



January 20, 1890. 



Lecture Evenikg. 



The President, Dr. Newberry, in the chair. 



About one hundred and eighty persons present. 



The third lecture in the Publiclllustrated Course was delivered, 

 as announced, upon 



THE ICE age in NORTH AMERICA, AND THE ANTIQUITY OF MAN. 



BY PROF. G. FREDERICK WRIGHT, LL.D., 

 OF OBERLIN COLLEGE, OHIO. 



The lecture was largely illustrated with lantern views, 

 comprising many taken by Prof. Wright in Alaska, represent- 

 ing the glacier-scenery of that region, particularly a series of re- 



