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"Diagram suggesting the type of structure possessed by the simple folding of strata. The diagram shows the folded surface was worn down." -Salisbury, 1919

Strata Folding

"Diagram suggesting the type of structure possessed by the simple folding of strata. The diagram shows…

Strata folding after erosion. "No further folding is shown, and erosion has isolated the hard layers as mountain ridges." -Salisbury, 1919

Strata Folding

Strata folding after erosion. "No further folding is shown, and erosion has isolated the hard layers…