202 



In the high hill just south of Aurora the rocks are exposed as follows 

 (H.35A): 



Ft. In. 

 45 — A few layers at the top contain Rafinesquina, the remainder cov- 

 ered 60 



44 — Limestone with Platystrophia, Hebertella, Rafinesquina, Monticuli- 



pora, etc 16 



43 — Highly fossiliferous limestone. Plati/slrophia, Hebertella, etc.... 1 6 



42 — Shale with occasional layers of limestone 4 4 



41 — Limestone with Zygospira and Gastropoda 3 4 



40 — Limestone. Rafinesquina (aa) 1 6 



39 -Shale 8 



38— Same as 32 4 



37— Covered 1 8 



36— Coarsely crystalline highly fossiliferous limestone 2 



35 — Covered 6 10 



31— Same as 32 3 



33— Shale 1 8 



32 — Coarse-grained fossiliferous limestone, with yellow argillaceous 



material in streaks 8 



31— Shale .* 6 



30 — Limestone. Zi/f/ospira and Hebertella 6 



29 -Shale and shaly limestone 1 3 



28 — Very fine grained compact limestone, no fossils 3 



28— Shale 1 



26 — Limestone intercalated with shale 1 . 6 



25-Shale 9 



24 — Sandstone 3 



23— Covered 2 6 



22 — Coarse-grained, blue limestone, mottled with brown. Large thick- 

 shelled Rajineiiquinas 



21— Shale 



20 — Hard blue crystalline 



19 -Covered 1 4 



18 — Limestone (in place ?) 10 



17 — Covered, probably limestone 10 8 



16— Steel-blue finely crastalline limestone with Rafinesquina 



15— Shale 



14 — Shaly sandstone 



13— Coarse crystalline limestone 



12— Shale 6 



1 1 — Compact limestone, gray mottled with yellow 6 



10— Shale 9 



9— Compact fine-grained drab limestone. Few fossils 9 



8— Shale 1 



