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[[preprinted]] 0017 [[/preprinted]] Sept. 29, 30 Ike's Canyon Sequence in brachiopod beds at top of canyon. [image: Sketch of Biostratigraphic diagram of area during the Silurian era.] Silurian| |Leptellina Sowerbyella | Rhysostrophia (coarse ribs) Toquimia, Valcourea Porambonites| Orthis (wide spaces between ribs fine-ribbed Rhyso Snails Aporthophyla| Sponges| Thin-bedded platy |