RECORDS 113 



SECTION OF GEOLOGY AND MINERALOGY. 



March i8, 1901. 



Section met at 8:15 P. M., Dr. A. A. Julien presiding. 



The minutes of the last meeting of Section were read and ap- 

 proved. 



Dr. A. A. Julien and Dr. Theodore G. White were re-elected 

 Chairman and Secretary respectively. 



The following program was then offered : 



J. F. Kemp, The Cambro-Ordovician Outlier at Wells- 

 town, Hamilton County, New^ York. 



G. van Ingen, A Method of Facilitating Photography of 

 Fossils. 



Summary of Papers. 



In introducing the main subject of the paper, Professor Kemp 

 gave a brief account of the physiographic problems presented in 

 the Adirondacks and of the significance of the smaller outliers of 

 Paleozoic strata which occur within the crystalline area. He 

 then discussed the Wellstown exposure and described it in much 

 the same way as he has already done in print in the i8th 

 Annual Report of the State Geologist of New York, page 145. 

 The general conclusion favored the existence of land areas 

 of ancient crystalline rocks in the vicinity of Wellstown, and it 

 seemed to the speaker that the peculiar sediments could not be 

 explained in any other way. Pebbles as large as one's fist, of 

 gneiss similar to that found in the ancient hills, are imbedded 

 in the Trenton limestone, and much sand is found in the lime- 

 stones of both the Calciferous and the Trenton. It was ad- 

 mitted that the present valley is due to faulting, as has been 

 previously claimed by Doctor R. Ruedemann, but the shores 

 of the late Cambrian and early Ordovician could not have been 

 far from the present outcrops of the Palaeozoics at W^ellstown. 



Mr. van Ingen, and Doctors Levison, Dodge, White and 

 Julien took part in the discussion of the paper. 



Doctor Julien remarked, in regard to the sand found in the 

 limestones to which Professor Kemp referred, that although the 



