No. 85 Graben with incised alluvium

Last known location: Geneseo, NY

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This block features a stratified sequence of cherry, green poplar, purpleheart, and maple that are offset by two normal faults and cut by a vertical dike of black walnut. These strata are down-dropped into a graben along the normal faults. Bedrock and yellowheart alluvial deposits accumulated in the graben are incised by glacial (U-shaped) and river (V-shaped) erosion.

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