﻿6i Split Rock i r 



resemblances of the rocks at these two somewhat distant locali- 

 ties. 



The above detailed discussion we hope will give a 

 fairly clear idea of the occurrence of the Manlius stage at the 

 most westerly section included in this paper. The changes, 

 lithologic faunal and stratigraphic occurring farther east, we 

 shall discuss in the pages which follow. 



II. Split Rock 



The large quarry at this locality affords a fine view of the 

 basal beds of the Onandaga and its contact with the Manlius 

 below. Bat we were somewhat disappointed in the faunal 

 features of the last mentioned stage. The following strata were 

 observed in a column left in the north-eastern part of the quarry 

 where evidently a derrick had formerly been located. 



Section at Split Rock Quarry. 



Ft. Thick 



1. Onondaga limestone, with Oriskany pebbles at base 2 



2. Light colored cement rock for 2.3 ft. then becoming grad- 

 ually hard, thick bedded and blue with a few fossil fragments 

 below 4.3 



3. Hard blue bed with gray bands. Leperditia, small Stro- 

 matopora and Spiri/er vanuxemi very abundant in layers 3.7 



4. Yellowish or cement-like above ; more bluish, with thin 

 yellowish bands below. With Sp. vanuxemi and Leperditia 2.3 



5. Bluish layers, very fossiliferous. Besides Sp. vanuxemi, 

 these layers contain Stropheodonta varistriata. Middle layers 



with Stromatopora 4.8 



6. As No. 5, but with less Stromatopora 8.3 



7. Bluish gray layers with Sp. vanuxemi 12.0 



8. Solid bluish layers, grayish above and below ; often show- 

 ing irregular lines of bedding. Stromatoporoid in places 5.0 



From the upper 2 ft. of bed No. 2, Luther reports Eurypterus. 

 (See 15th anu'l Rept. St. Geol. for 1895, p. 268.) This, we 

 believe to be the highest horizon from which the species (pre- 

 sumably remipes) has been reported. 



In the barn lot opposite the Electric R. R. station, much dis- 

 turbed layers, apparently Rondout, were observed. 



