24: TRANSACTIONS OF THE [OCT. 23, 



however, are only a begiuninj^f of future work. On the west 

 side Dr. C. H. Smyth, Jr., of Hamilton College, was working in 

 close association. 



In summing up on the geology of the Adirondacks, it may be 

 stated that the following views relative to the stj'atigraphy of 

 the crj'stalline rocks have been held. 



I. It has been usually believed, that the gneisses are the 

 oldest and are metamorphosed sediments ; that the norites are 

 later, some regarding them as igneous, others as metamorphosed 

 sediments ; that the limestones are latest of all. 



If this be admitted and the norites be regarded as igneous 

 intrusions, how is it that no dikes or apophyste have ever been 

 mentioned as radiating or offsetting from this enormous mass ? 



II. That there is a core of central and oldest norite, having 

 later gneiss as a metamorphosed sediment on its flanks, and 

 still later limestone on both norite and gneiss. 



One or the other of these views has been held by almost every 

 one at all familiar with the region and they have been in many 

 minds, if not so definitely stated in print. It must be recognized 

 that the region is badly faulted and broken, as the mines, the 

 topography and the geology indicate. "N^'hile any one of the 

 three generally received divisions are easily recognizable in 

 typical cases, they yet have been so suV)ject to metamorphism 

 that there are intermediate members of great obscurit}-. The 

 region requires careful and systematic field-work, with parallel 

 microscopic determinations. It is remarkable how little 

 detailed work of any stratigraphical value has yet been 

 published on the crystalline rocks. 



Geological Department, Columbia College, Oct., 1892. 



Prof. Osborn spoke of a singular rounded and polished hole 

 in rock on the place of F. A. Church Esq., on the Hudson 

 River. It is evidently a gigantic pot-hole. 



Dr. Bolton asked for information concerning the supposed 

 fitid of buffalo remains at Plainfield N. J. Dr. Dean and Prof. 

 Osborn replied that they could as yet see no evidences of these 

 remains being other than those of deer, and further that the 

 newspaper reports of interviews were not strictly correct. Prof. 

 Kemp remarked that he had a hippopotamus tooth said to 

 have been discovered near Eamapo, N. J. 



Meeting adjourned. 



