THIRD REPORT OF THE DIRECTOR I906 9 



Central and western New York. For the sedimentary rock 

 region of central and western New York the publication of the 

 Buffalo, Penn Yan and Hammondsport sheets has been completed 

 and the Rochester and Ontario Beach sheets, to be issued as one, are 

 printing. 



The maps of the Ovid, Genoa and Morrisville quadrangles have 

 been perfected and drawn and the field work has been done on the 

 Geneva, Auburn, Nunda and Portage sheets. Some progress was 

 also made on the Skaneateles and Phelps quadrangles. With the 

 exception of the Morrisville and the Rochester-Ontario Beach maps, 

 this work has been executed by Mr Luther. Farther east Mr 

 Whitnall has completed the Cazenovia sheet which lies between the 

 Morrisville area and the Tully quadrangle which latter was issued 

 two years ago. 



The survey of the Syracuse quadrangle has been in charge of 

 Prof. T. C. Hopkins who reports the work completed and the map 

 ready for publication. 



With the completion of these quadrangles, added to those already 

 issued in recent years in the adjoining region, the Canandaigua, 

 Naples, Watkins, Elmira, Salamanca and Olean quadrangles, we are 

 able to present in detail the geological structure of an extensive area 

 with an east-west length of 120 miles and reaching from Lake 

 Ontario to the Pennsylvania line. This is a region largely of De- 

 vonic rocks developed in their most characteristic and typical 

 American expression, hence we now have the entire thickness of 

 this formation recorded in detail together with the variations east 

 and west of the formational units and the paleontological contents. 

 Included also in this area of close mapping are sections of the 

 Upper Siluric in the Rochester and Syracuse regions and of the 

 Lower Carbonic in the Olean and Salamanca districts. 



Schoharie and Cobleskill valleys. A very detailed map of this 

 classical region in the Paleozoic rocks of New York has been issued 

 during the past year, prepared by Professor Grabau and published in 

 connection with his bulletin on the Geology and Paleontology of the 

 Schoharie Valley. 



The history of New York geology may be said to begin with this 

 region and nowhere in the State are the Paleozoic rocks crowded 

 together in so great variety and so characteristic development, nor 

 is any part of the State more inviting to the student of geology, 

 yet until now no adequate map of the region has existed. 



Theresa quadrangle. I last year reported the progress made 

 by Professor Gushing in the mapping of this region. The region 



