University of the State of New York 



New York State Museum 



Frederick J. H. Merrill Director 

 John M. Clarke State Paleontologist 



Bulletin 69 

 PALEONTOLOGY 9 



REPORT OF THE STATE PALEONTOLOGIST 1902 



To the Regents of the University of the State of New York 



I have the honor to report herewith on the work of this depart- 

 ment during the year commencing Oct. 1, 1901. 



Operations in the field 1901-2 



Guelph horizon and fauna. In my report of last year I had 

 occasion to make reference to investigations relating to the 

 distribution of the Guelph horizon and its fauna throughout 

 western New York. This interesting congeries of fossils, con- 

 stituting essentially a new element in the Paleozoic faunas of 

 the New York series of geologic formations, had at that time 

 been found only in the vicinity of Rochester, with the exception 

 of an early locality in Wayne county mentioned by Professor 

 Hall in 1843, but subsequently lost. As noted in the report 

 referred to, our effort of that year to locate other manifesta- 

 tions of this horizon between Rochester and Niagara Falls 

 along the summit of the Niagara escarpment was not successful 

 in its main object, though contributing interesting data bearing 

 on the contact outcrops of various formations immediately 

 involved. The horizon of the Guelph lies so involved with the 

 upper beds of the dolomite series which constituted the closing 

 episode of the Niagaran stage in New York, and these dolomites 

 are, notwithstanding their massive and resistant character, so 

 seldom exposed in continuous section, that the few natural cliff 

 exposures through this region are very unsatisfactory for the 

 determination of the contents of the strata. 



