544 DESCRIPTIVE GEOLOGY. 



The section given in volume III, from Treasure Peak to the summit of 

 Mokomoke Ridge, presents the following beds: 



Feet. 



1. Dark bluish-gray compact limestone 1,500 



2. Thinly -laminated calcareous shales with interstratifled reddish-gray bands. . 125 



3. Siliceous limestone with lenticular masses and nodules of chert 100 



4. Black argillaceous shales, compactly bedded, with seams of bituminous "j 



matter ! ^^^ 



5. Black shales more arenaceous than No. 4, with interstratifled thin beds of | 



crumbling sandstone 3 



0. Eeddish-yellow sandstone, fine-grained, even texture , 300 



7. Light-yellow granular limestone, distinctly bedded, rich inOoal-Measure fossils. 1,500 



Upon Treasure Hill are exposed at least 1,500 feet of blue limestone, 

 the upper 800 feet of which have been shown, b j palseontological evidence, 

 to be of Devonian age, and the lower beds, although they have as yet yielded 

 no organic remains, have been referred, in the absence of any direct evi- 

 dence, to the same horizon, the Ogden Quartzite not coming to the surface 

 along the base of the ridge. 



The species obtained from these Devonian strata range, according to 

 Messrs. Hall and Whitfield, from the Upper Helderberg to the Chemung 

 horizons of the New York section. 



From Treasure Hill were obtained: 



Cladopora proUfica. 



Biphyphjllum fasciculum. 



Acervularia pentagona. 



Ftycliophyllum infunMMlum 



Naticopsis, sp. undet. 



OrtJioceras Kingii. 



StropJiodonta canace. 



Productus sid)acv,leatus. 



Atrypa reticularis. 



BhyncJionella JEmmonsi 



Pentamerus, sp.? 



Spirifer argentarius. 



Cryptonella, sp. ! 



Orthis, sp.?; resembles 0. resupinata. 



