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SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 78 



GEOLOGICAL FIELD-WORK IN NEW YORK AND ONTARIO 



In continuation of work begun in 1925 by tbe division of paleon- 

 tology of the U. S. National Museum, Mr. Erwin R. Pohl was 

 detailed to spend four weeks during the summer of 1926 in the 

 field in procuring the detailed data necessary to label correctly as to 

 geological horizon the large collections of Devonian fossils from 

 many classic localities in the eastern L'nited States. Work was con- 

 tinued on the section at Kashong Creek in west-central New York 

 where the beds of lower Hamilton age. including the Skaneateles and 

 Ludlowville shales were made the subject of close stratigraphical 



Fk;. 46. — Falls of Kashong Creek over upper part of Ludlowville shale. 

 Bellona, Seneca Lake, N. Y. (Photograph by E. R. Pohl.) 



study. These strata contain many rare and excellently preserved 

 invertebrate fossil remains, and not only were the collections in- 

 creased but the information was also acquired to make those already 

 in the Museum of real scientific value under the newer methods of 

 study. Figure 46 illustrates one of the many charming waterfalls 

 that abound in this section of the country. The strata here lie prac- 

 tically horizontal, and the falls are almost invariably due to the resis- 

 tance of a harder bed of rock and the undercutting of the less resistant 

 underlying" layers. 



At Ithaca, N. Y., due to the general southerly dip of the strata. 

 excellent exposures of upper Devonian rocks are aft'orded, and the 

 locality shown in figure 47 is a collecting ground that has long been 



