In the Onndaga Shales there is considerable remains of a slender branching faucid, very like those of the Ordovay Shale. The transition from the Onndaga to the Marcellus is gradual, or break here. At the top of the Onndaga then folded (4-12 inhs) impure bi, predominate and the fossil shell grows are thin (0-2 inches) Loma come and come shale is again introduced when the section looks similar like the Lower Ordovay. The Clionets are very large, some more than 1/2 inch across.