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"In sedimentary deposits, however, some variation from horizontality may be produced by the slope of the sea-bottom in certain cases." -Dana, 1880

Sedimentary Deposits

"In sedimentary deposits, however, some variation from horizontality may be produced by the slope of…

"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…

These diagrams show the unconformity of strata. "In some places a series of strata A, having a certain dip, rest directly upon the eroded surface of another series, having either the same dip (B), or an entirely different one (C)." -Hinman, 1888

Unconformable Strata

These diagrams show the unconformity of strata. "In some places a series of strata A, having a certain…