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"Section showing displacement of strata by a fault. a and a were once a continuous mass of rock." -Whitney, 1911

Displacement of Strata

"Section showing displacement of strata by a fault. a and a were once a continuous mass of rock." -Whitney,…

A geologist collecting and studying rocks.

Geologist

A geologist collecting and studying rocks.

"Section showing Granite nucleus, with strata lying on its flanks, the overlapping and continuous portions of which have been denuded off." -Taylor, 1904

Granite Section

"Section showing Granite nucleus, with strata lying on its flanks, the overlapping and continuous portions…

This image shows the foldings in strata.

Strata Folding

This image shows the foldings in strata.

"Generalized columnar section, northern Black Hills." -Walcott, 1901

Strata Thickness

"Generalized columnar section, northern Black Hills." -Walcott, 1901