lO NEW YORK STATE MUSEUM 



II 



REPORT ON THE GEOLOGICAL SURVEY INCLUDING 



THE WORK OF THE STATE GEOLOGIST AND 



PALEONTOLOGIST, OF THE MINERALOGIST 



AND THAT IN INDUSTRIAL GEOLOGY 



GEOLOGICAL SURVEY 



Areal rock geology 



In continuation of operations directed toward the execution of 

 a geological map on the topographic base of i mile to the inch 

 progress has been made along lines which have been pursued for 

 several years. 



Central and western New York. Since my last report the double 

 map including the Rochester and Ontario Beach quadrangles, em- 

 bracing the city of Rochester and its environs, has been issued. This 

 report was prepared by Mr Hartnagel. The Geneva-Ovid double 

 north and south sheet and the Portage-Nunda double east and west 

 sheet are printing. The latter contains special maps of Letchworth 

 park at the Portage falls of the Genesee river and a chapter on the 

 postglacial history of the river. 



The Auburn-Genoa and the Honeoye-Wayland quadrangles have 

 been completed as separate double maps, while the map of Phelps 

 remains as a single quadrangle. Work has also begun on the Cale- 

 donia quadrangle and some preliminary observations made on the 

 Belfast sheet. All this work has been executed by D. D. Luther. 

 Of other quadrangles awaiting publication are the Syracuse sheet by 

 Prof. T. C. Hopkins and the Morrisville sheet by H. 'O. Whitnall. 

 The field work for the Cazenovia sheet has also been completed and 

 that on the Chittenango sheet begun by Mr Whitnall. 



All the quadrangles above referred to cover areas of sedimentary 

 rocks only and the problems arising thereupon are almost exclusively 

 those of refinement of stratigraphy and correlation. 



Field work on the Remsen quadrangle has been completed by 

 Prof. W. J. Miller. The northern half of this quadrangle is occu- 

 pied by crystalline rocks and the rest by the Paleozoic sedimentaries. 

 The crystallines include (a) highly altered Grenville sediments, 

 (b) syenite gneiss, (c) a complex made up chiefly of intermingled 

 Grenville rocks and syenite. The Paleozoic rocks comprise the 

 Trenton series of limestones and the Utica shale. 



