GUELPH FAUNA IN THE STATE OF NEW YORK 1 9 



Rochester and vicinity : Pike quarry, Frost avenue and Summer street. 

 The section where best exposed is as follows, beginning at the bottom, 

 which is the surface of the water in the quarry : 



1 Brownish gray to black scraggy dolomite with drusy cavities. 



Stromatopora and Favosites abundant. (See Allen creek sec- 

 tion, no. 4) 2 feet 



2 Compact unbroken dolomite 5" 



3 Dark brown dolomite like 1 3" 



4 Dark bluish gray dolomite, weathering brown ; compact - 10 " 



5 Brown sandy dolomite in layers 2 to 4 inches thick. Heavier 



layer at top. Stromatopora and Zaphrentisbilateralis 6 " 



This section is clearly all of Lockport dolomite. 



Nellis quarry, McLean street. The highest part of this locality is 

 1200 feet west and 600 feet south of Pike quarry, and this rock section 

 runs 15 feet higher than in that section. The white chert nodules from 

 which Mr Arey obtained many of the Guelph species before workings 

 here were abandoned, are all in the upper part of this additional 

 thickness. 



The rapids, Genesee river. The exposure here is 25 or 30 rods long 

 and includes about the same section as Pike quarry. The Guelph horizon 

 with white chert is not exposed. 



Lauer quarry, town of Gates, 2 miles west of the Rochester city line. 

 The lower part of the section exposes 1 5 feet of dolomite with Favosites, 

 Stromatopora and Enterolasma caliculus (Lockport). The high- 

 est part of the quarry gives 3 feet additional, which may rise to the Guelph 

 horizon, but no satisfactory evidence is at hand. The elevation here is 550 

 feet A. T. The quarry is not now operated. 



Newman quarry, 1 ^ miles north of Lauer quarry and 3 miles west of 

 Rochester city line; town of Gates; 30 to 35 feet above the preceding. 

 At the south end of the quarry the section is from the bottom. 



