-150- Section 8 cont. Thicknes (feet) 17. Calcarenite, yellow-brown weathering, becomes well cemented and contains chert pebbles in upper 5 inches, coll. 8-17, Schwagerina nelsoni, S. diversiformis, S. dispansa, Bryozoa, Smaller Foramini- fera, siliceous sponge spicules . . . . . . . . . . 1 1/2 16. Covered, probably gray shale . . . . . . . . . . 11 15. Calcarenite, orange-brown weathering, a few cobbles up to 4 inches in diameter, becomes better sorted and finer grained towards top of unit especially in upper 5 inches, planar upper surface, coll. 8-15, Pseudoschwagerina robusta, P. texana, Schwagerina nelsoni, S. cre- brisepta, S. hessensis? . . . . . . . . . . 4 1/2 14. Shale, gray with slight brown tinge, siliceous sponges spicules . . . . . . . . . . 5 13. Covered, probably gray shale . . . . . . . . . . 13 12. Calcarenite, green and orange-brown weather- ing, poorly sorted near base, some fine chert pebbles near base, upper 4 inches well sorted, coll. 8-12, Pseudoschwagerina robusta, Schwagerina crebrisepta, S. elsoni, S. laxissima . . . . . . . . . . 3 1/2