522 PROCEEDINGS OF THE WASHINGTON MEETING 



The fourth and last ])aper of the morning's session was 



DEVOXIAN AXI) CARBOyiFEEOUS ROCKS OF SOUTHWESTERy XEW YORK* 



BY L. C. GLENN 



\^Ahstract] 



Contents 



Page 



Introduction 522 



Purpose of paper 522 



Age of rocks and problems involved 523 



Topography 523 



structure 523 



Formations 523 



Chemung shales and Cuba sandstone lentil 523 



Cattaraugus 524 



Wolf Creek conglomerate lentil 524 



Shales and sandstones 525 



Fossils 525 



Salamanca conglomerate lentil 525 



Kilbuck conglomerate lentil 526 



Probable unconformity 526 



Oswayo 527 



Composition ^ 527 



Limestone layer 527 



Knapp formation 527 



Pottsville — Olean conglomerate -. 528 



Age of the formations 528 



Results of a reconnaissance into Pennsylvania.. 528 



Wolf Creek conglomerate 520 



Salamanca conglomerate , .529 



Wrightsville conglomerate 53(i 



Olean and Sub-Olean conglomerates ... 530 



Local pebble beds 531 



Fucoids 531 



Introduction 



During the summer of 1900 the detailed geolojiical mapping of the Olean and 

 Salamanca quadrangles in southwestern New York was undertaken b}' the United 

 States Geological Survey in cooperation with the state of New York, and the writer 

 was placed in charge of the work. The work was continued and finished the next 

 summer. Mr Myron L. Fuller assisted largely in the work on the Salamanca quad- 

 rangle the latter season, and during both seasons Mr Charles Butts made extensive 

 paleontological collections from the two quadrangles and the adjacent region. 

 Reconnaissance work was pushed southward to Bingham, Pennsylvania, and west- 

 ward across McKean and Warren counties to near Corry, Pennsylvania. 



Purpose of Paper 



It is the main purpose of this paper to describe briefly the stratigraphic suc- 

 cession found in the Olean-Salamanca region, to state the paleontological conclu- 

 sions so far reached as to the age of the formations, and the results of the eflforts 



*The full paper is published in the Report of the New York State Paleontologist for 1902, pp. 

 967-989. 



