REPORT OF THE STATE PALEONTOLOGIST 1902 869 



Paleontologic Results of the Areal Survey of the Olean Quad- 

 rangle, by John M. Clarke. 



Potsdam Sandstone of the Lake Champlain Basin, by Gilbert 

 van Ingen. 



Graptolite Facies of the Beekmantown Formation in Rensse- 

 laer county, N. Y., by Rudolf Ruedemann. 



Growth and Development of Goniograptus thureaui 

 McCoy, by Rudolf Ruedemann. 



Fossil Alga from the Chemung of New York, by David White. 



A new Genus of Paleozoic Brachiopods, Eunoa, by John M. 

 Clarke. 



Stratigraphic Value of the Portage Sandstone, by D. D. Luther. 



Paleozoic Seas and Barriers in eastern North America, by 

 E. O. Ulrich and Charles Schuchert. 



Indigene and Alien Faunas of the New York Devonic, by 

 John M. Clarke. 



The succession of faunas on the Salamanca quadrangle. The col- 

 lections which had been made in the field during the survey of 

 the Salamanca area were carefully studied and determined for 

 use in the delineation of the formations on the map. These 

 determinations were made in this office by Mr Charles Butts, 

 who was occupied therewith during the early part of the year. 



Cooperation with the state engineer and surveyor. By an ar- 

 rangement made with the state engineer and surveyor, we have 

 been able to avail ourselves of the services of Gilbert van Ingen, 

 formerly instructor in geology at Columbia University. Mr van 

 Ingen gives one half of his time to the official named and the 

 other half is given to duties connected with this office. He 

 has therefore been engaged in prosecuting investigations which 

 he had previously begun on the Potsdam sandstone and the fauna 

 of the Beekmantown limestone. This arrangement is a tem- 

 porary one, and we can not hope for its continuance after the 

 expiration of April next. 



The areal and paleontologic maps of the Canandaigua and Naples 

 quadrangles. In my last report I noted that these maps had 

 been essentially completed, and that we have here endeavored 

 to establish a more detailed subdivision of the formations than 

 has before been attempted. During the past year these maps 

 have been carefully revised and corrected, and some time was 



