No. 119 Cross-cutting relationships puzzle block with inverted topography

Last known location: San Antonio, TX

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This wooden block features a basalt-capped plateau (black walnut) that is incised by rivers that are downcutting into a stratified sequence of maple, cherry, green poplar, beech, yellowheart, jatoba, and purpleheart. These strata are cross-cut by a complicated array of geologic structures, including thrust, normal, reverse, and strike-slip faults. These faults are cross-cut by two dikes — one of orange padauk and the other in mahogany one with “chilled margins” of red jarrah wood. These strata are nicely exposed in valley systems to accentuate Rule of Vs patterns. The basalt flow that is capping the inverted topography is erupting from the base of a cinder cone of black walnut. The base of this very large, 2 pound block measures roughly 8 inches by 5 1/2 inches and is finished with a durable satin lacquer.

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