CHAPTER IX.. On the Imperfection of the Geological Record.

ON THE IMPERFECTION OF THE GEOLOGICAL RECORD.

On the absence of intermediate varieties at the present day--On the nature of extinct intermediate varieties; on their number--On the vast lapse of time, as inferred from the rate of deposition and of denudation--On the poorness of our palæontological collections--On the intermittence of geological formations--On the absence of intermediate varieties in any one formation--On the sudden appearance of groups of species--On their sudden appearance in the lowest known fossiliferous strata

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