No. 47 Inverted topography with headward erosion & stream piracy

Last known location: Houston, TX

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This wooden block features a stratified sequence of maple and Brazilian cherry that is cut by two, cross-cutting normal faults and is capped by a basalt flow of black walnut. Once filling the floor of a river valley, the basalt flow shielded the underlying rocks from subsequent erosion. Erosion carved new river valleys on either side of the basalt flow capped ridge. Headward erosion associated with one of these new river valleys has cut through the basalt flow. The base of the block measures roughly 4 1/4 inches square and is finished with Tried & True® linseed oil and beeswax.

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