114 



Fauna of the Plokena Shale of the Gkand Summit Sec- 

 tion OF Kansas^ and Remarks on the Develop- 

 ment OF Derbya Multistbiata Meek and Hayden. 



F. C. Greene. 



The Graucl Summit section of Cowley county, Kansas, lias been fa- 

 mous as one of the classic collecting grounds of Kansas and many large 

 collections have been made there. It could probably be classed as Permo- 

 Carboniferous, very near the base of the Permian. The region was first 

 studied by Broadh^^ad in 1882 and the account published in 1883 or 1884. 

 He says, "We now come to speak of the 'Permian' or limestones of the 

 'Flint Hills," reaching, in Elk, (4reenwood and the eastern half of Butler 

 and Cowley counties, from 1185 to 1700 feet aboA-e the sea, including about 

 500 feet thickness."* 



Only the top iiart of Broadhead's section concerns us. Numbering from 

 top down, it is as follows :t 



1. 134 feet, including beds of impure drab limestone, shaly and 

 crumbling, with occasional shale beds, with red shales 30 feet from bot- 

 tom. 



'2. 5 feet of bluish-drab or drab limestone containing many good char- 

 acteristic fossils, including Eumicrotis hawni, Myalina perattenuata, Avi- 

 culopecten occidentalis, etc. (This bed is persistent wherever its associated 

 strata are found.) 



3. 10 feet of shales, the lower red. 



4. 10 feet of rough limestone. 



5. 27 feet of shales with thin shaly limestone beds. 



6. 4 feet of fiag-like limestone ; a good building stone. 



7. 8 feet of shelly buff magnesian limestone. 

 . 8. 4 feet of shaly Fusulina limestone. 



9. 4 feet of cherty limestone; abound in Fusulina cylindrica, the 

 fossils often appearing in relief; the chert of deep blue. 



*Trans, St. Louie Acad. Sci., Vol. IV., Pt. S, pages 480-487. 

 tLoc. Git. 



