REPORT OF THE STATE PALEONTOLOGIST 1902 855 



heretofore prevailed in developing the stratigraphic and 

 paleontologic relations on the Olean and Salamanca quad- 

 rangles, we have this year carried forward to completion, in 

 cooperation with the United States Geological Survey, similar 

 work on the Elmira quadrangle. On this work Messrs Myron 

 L. Fuller and F. G. Clapp were detailed by the director of the 

 United States Geological Survey, and this department was 

 represented by C. A. Hartnagel and H. S. Mattimore in the 

 necessary collection of fossils. The area covered by the Elmira 

 quadrangle being in some degree lower down in the rock series 

 than the areas of the Olean and Salamanca quadrangles, the 

 questions which there arose in regard to the classification of 

 the culminating geologic horizons have not been revived in 

 this case. Most of the territory about Elmira is underlain by 

 rocks of the Chemung stage, though at the north, in the low 

 lands and valleys, are small, restricted areas of the Portage 

 formation directly underlying. Sections however do not rise 

 to any considerable hight, so that the hill summits do not enter 

 on the horizons of the Wolf creek, Salamanca or Panama con- 

 glomerates. On account of the simplicity of the stratigraphic 

 problem here involved, the time required for the field work was 

 not long. The area between the Elmira and the Olean quad- 

 rangles is as yet but partially surveyed, and no maps have been 

 made available for stratigraphic work, but it is on these inter- 

 vening quadrangles that we may expect to find additional and 

 important light on the problems which have arisen in the detailed 

 study of the geologic succession in Cattaraugus and western 

 Allegany counties. 



The fauna and stratigraphic relations of the Coralline or Cobleskill 

 limestone. " Coralline limestone " is a term applied by Prof. 

 James Hall to a fossiliferous formation in eastern New York 

 which he believed to be the eastern extension of the Niagara 

 or Lockport dolomites of the Upper Siluric. The name was not 

 one of the original elements in the nomenclature of the forma- 

 tions as proposed by the four geologists, though the term was 

 originated by and had been in local use by John Gebhard. the 

 pioneer of geology in the region about Schoharie county where 

 this formation is best developed, and was also employed by 



