Geology . Fig. 482.—Strise on bed-rock, Kingston, Des Moines County, la. (la. Geol. Fig. 483.—Grooves in limestone on Kelleys Island, Lake Erie. The grooves showby their lack of strict parallelism that different parts of the grooving were accom-plished at somewhat different times. The foot-rule indicates the scale, and itsshadow defines the groove. (U. S. Geol. Surv.) 348 OEOLOOY al all elevations where the drift occurs. The markings on the bed-rock beneath the drift are so like those on the stones of (he drift, thatcommunity of origin cannot be doubted. .& 8 0

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