Stratigraphy of Kansas Permian — Beede and Sellards. IQ5 
24. Limestone, massive, mottled and rough 3 
23. Limestone with three thick layers of chert... 3 
22. Covered 8 " 
21. Olive shales 2+ " 
20. Shale, yellow, arenaceous 1 
19. Limestone, massive, chert in top 1 6 
18. Limestone with large chert concretions 6 " 
17. Limestone, partially silicified and carrying 
chert ■ 1 " 6 
16. Limestone with coarse chert concretions....: 4 " 6 
15. Limestone full of small chert concretions 5 " 
14. Shales, calcareous and impure limestones, 
Derby as 8 " 6 
13. Clay shales 9+ " 
12. Shales, red 5+ " 
11. Covered 15 " 
10. Limestone, rough, massive 3 " 6 
9. Shales 8 " 6 
8. Limestone, fossiliferous 1 " 
7. Covered 5 " 
6. Limestone, springy slope beneath, (S. of Cam- 
bridge quarry) 2± " 
5. Covered 34 " 
4. Shales, blue, slaty, calcareous, in quarry 4 " 
3. Limestone, hard, massive, fossiliferous " 9 
2. Limestone, massive, hard 2 " 6 
1. Covered to creek bed 41 " 
Total 254 ft. 3 inches 
Numbers 2 and 3 are exposed in the quarry west of 
Cambridge. Lithologically the stone of this quarry is strik- 
ingly like numbers 27 and 28 of the Beaumont section, which 
would be somewhat above number 25 of the Grand Summit 
section. However Prosser is of the opinion that the rock 
in the Cambridge quarry is identical with number 25 of the 
Grand Summit section.* On the whole. the Grand Summit 
section and the Cambridge to Burden section are to be con- 
sidered as continuous. Whether or not numbers 2 and 3 
of the Cambridge section are the same as number 25 of tin- 
Grand Summit section is a matter of minor importance to 
the consideration of the sections as a whole. Numbers 15 
to 24 represent the Wreford limestone with a thickness of 
* Kans. TJniv Quart., vi, p. tfifi. This limestone he correlated with the 
Wreford limestone (= Strong Hint). 
