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30 (written sideways: Uppermost beds, few fossils Transition Upper Tuffs }Fossil Zone Transitional beds Upper channel and orange tuff. Lava + intermediate clays Lava etc. Soft cg. Fossils Intermediate soft Massive Tuff. Tuffs + Transition Fossil Level Lower channel + orange Fossil level Massive Tuff. Lower Tuffs Manganese Layer Profile A generalized, with chief guide horizons and fossil levels) Bed X of Profiles I and J traced con- tinuously proves to be the same as the 'lower channel' of profiles A and G. Bed Y of those profiles is the tuff (#53, 54 etc.) of p. 6.