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gone on continuously and without material change of [[strikethrough]] level [[/strikethrough]] plane or tilting of the deposited strata though they may have sunk. That the throwing out of the volcanic conglomerate did not interrupt the general detrital action which may even be said to be going on still. That during this disposition the valley was a freshwater lake or estuary which did not sustain marine life. or at all events was not favorable to its existence, and at the same time afforded no suitable conditions for freshwater shells.