DEVONIAN AND LOWER CARBONIFEROUS FOSSILS. 



483 



Table of Devonian species. 





43 



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Cvathopliyllum csespitosum (?) 











9 



Pachyphvllum sp 

















X 









x 













Favosites sp 

















X 





Spirifer engelmanni 













x 







Atrypa missoixrieusis 











x 



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X 



Atrvpa reticularis 



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X 

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LOWER CARBONIFEROUS. 



The Madison limestone has been divided by the geologists of the 

 Survey, upon lithologic characters, into nine beds, ranging from 24 to 32, 

 both inclusive, of then section scheme. The following table, representing 

 in condensed form the stratigraphic succession ascertained in the Yellow- 

 stone National Park, was kindly supplied by Mr. Arnold Hague, geologist 

 in charge of the Yellowstone National Park survey: 



Quadrant quartzite. 

 Madison limestone. 



Bed. Feet. 



32. Four strata of light-gray, more or less cherty limestone 655 



31. Gray banded limestone, with abundant fossils 400 



30. Massive light-gray limestone 65 



29. Light-gray and brown, very finely crystalline or granular limestone 85 



28. Limestone, crystalline, light gray aud generally massive 200 



27. Limestone, dark gray and buff, very argillaceous, thick aud thin bedded. . . 50 

 26. 15 feet of quite pure and 60 feet of thin-bedded argillaceous limestone, 



both containing fossils 75 



25. Coarsely crystalline, dark-gray limestone 80 



24. Limestone, finely crystalline and massive below, cherry in its upper portion . . 60 



Total 1,670 



Three Forks limestone. 



