-171- Section 17 contd. Thicknes (feet) 14. Calcirudite, like unit 12 . . . . . . . . . . 19 13. Conglomerate, brown weathering locally, chert and quartzite pebbles more abundant than limestone pebbles, the change from unit 12 to unit 13 is rather abrupt even for conglomerate lenses, 4 to 6 foot beds . . . . . . . . . . 28 12. Calcirudite, gray to dark gray weather- ing, limestone cobbles up to 10 inches in diameter, chert as sand size particles only . . . . . . . . . . . . . . . . . . . . . . 20 11. Conglomerate, very fine chert pebbles, matrix of limestone sand with crinoid fragments . . . . . . . . . . . . . . . . . . . . 2 10. Covered, probably mostly shaly sandstone, coll. 17-10, Parafusulina linearis, Schwagerina nelsoni . . . . . . . . . . . . . . 23 9. Calcarenite, dark gray, coll. 17-9, Schwagerina compacta, S. laxissima, S. diversiformis, Pseudoschwagerina tumidosus, Paraschwagerina plena? . . . . . . . . 1 8. Sandstone, gray-brown, well sorted, very fine to fine sand, 6 inch to 3 foot beds . . 16 7. Limestone, dark gray, fine calcarenite