﻿26 Bulletin 19 76 



Countryman Hill Section, lower escarpment 



Ft. Thick 



1. Coeymans limestone 32.0 



2. Brachiopod transition layers 2.5 



3. Blue limestone 1.0 



4. Stromatopora bed, with gasteropods at base 3.2 



5. Solid blue layers 4.8 



6. Light buff cement rock 3.3 



7. Limestone layers, irregular above Strom atoporoid below.... 9.0 



8. Blue limestone 1.3 



9. Thin, even-bedded layers 6.0 



10. Even-bedded, thicker layers ; Leperditia, and Sp. vanux- 



emi 6.0 



n. Dark blue and gray limestone, rather thin-bedded, with 

 Stroph. varistriata, Sp. vanuxemi, Megambonia aviculoidea, 



Orthoceras, Leperditia and Tentaculites gyracanthus 16.0 



General Resume 



1. In the upper portion of the Manlius stage (that represent- 

 ed between the dotted lines on PI. I) there is a rich brachiopod 

 fauna. This is preceded or introduced by a comparative large 

 number of Spirifer vanttxemi. 



2. Whereas the number of individuals in this fauna may be 

 as great in sections towards Union Springs and the Helderbergs 

 as intermediately, the number of species and genera increases 

 in a most remarkable way in the intermediate sections. 



3. The new species introduced into this Manlius horizon are 

 all of Helderbergian type, though the most characteristic Coey- 

 mans brachiopod, Gypidula galeata seems to be wanting 



4. This fauna is usually separated from the true Helderberg- 

 ian beds by (1; a stratum of buff colored limestone (see PI. 9) 

 resembling the cement layers at Manlius, or (2) by solid lime- 

 stone layers with an abundance of Stromatopora , or (3) by both. 



5. The greatest development of beds mentioned under "4", 

 is found in the region of Manlius. 



6. So far as we have observed, the so-called Manlius fauna 

 does not recur after the appearance of Gypidula galeata. 



7. There seems, then, not to be a hopeless intermingling of 

 Helderbergian and Manlius faunas. Some regions were more 



