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Unconscious (Strata must have been more)

THE of the strata must have been more or less acted on by denudation, which has rendered them a nearly horizontal plane on which fresh strata can easily rest.

Thirdly, these fresh strata have been actually deposited. Approximately to measure the interval of time which these changes have occupied, intermediate beds must be sought for in other districts or regions, or, failing these, note must be taken of the amount of alteration in life which has occurred during the unknown interval. This may be determined by comparing the fossils in the lower with those in the upper beds . Unconformability is of value in fixing the date of ancient seismic or volcanic action. If it tilted up the lower and had no influence on the upper strata, the irresistible inference is that it occurred between the deposition of the two.