REPORT OF THE DIRECTOR AND STATE GEOLOGIST 1903 199 



ing a most remarkable display of trails made by trilobites or 

 mollusks. This specimen is from Clinton county, where it was 

 long known to the inhabitants, but was brought to public notice 

 by Prof. J. B. Wood worth in a paper published by this 

 department. 



The stratigraphic and paleontologic maps of the Oanandaigua 

 and Naples sheets have been completed and will be presently 

 issued as a bulletin of the Museum. 



The death of Philip Ast, who has been lithographer for a period 

 of more than 30 years, left a vacancy, which has been filled by 

 the appointment of William S. Barkentin. 



During the latter part of the season of 1902 and in the field 

 season of 1903 Dr Ruedemann was engaged in field opeTations 

 in Rensselaer and Washington counties, where, by the discovery 

 of certain horizons of graptolites, it became possible to find a 

 definite contact line of the Cambric and Lower Siluric formations. 

 His study of the graptolite faunas of the olde'r rocks has led him 

 to cover a considerable part of northern Rensselaer and Wash- 

 ington counties in such detail as to furnish an accurate strati- 

 graphic map of this region. Dr Ruedemann has also restudied 

 the occurrences of the slate beds bearing graptolites in the vicinity 

 of Hudson, Columbia co. For the greater part of the season he 

 has been engaged, in continuation of previous operations, in col- 

 lecting materials for a careful analysis of the Lower Siluric 

 (Beekmantown and Chazy) faunas in the Lake Champlain basin, 

 his collections and field operations having covered, throughout 

 the entire length of the lake, all the leading outcrops, many of 

 which were heretofoTe unrecorded, and w^hich are sufficient to form 

 the basis of an exhaustive examination of these faunas. 



Mr D. D. Luther has completed the acquisition of the data 

 necessary for stratigraphic maps of the Elmira and Watkins 

 quadrangles. He has also made a careful reconnaissance of the 

 Waverly and Ithaca quadrangles on the east, and, with a small 

 amount of additional work, it will be possible to color these 

 sheets. Reconnaissance has likewise been made of the region to 

 the west of Elmira and Watkins sheets. Some time has also been 



