Fossil distortion and décollement tectonics of the Appalachian Plateau

Terry Engelder, Richard Engelder

Research output: Contribution to journalArticle

65 Scopus citations

Abstract

Fossil distortion and solution cleavage are associated with low-amplitude folds on the outer fringes of the Appalachian foreland fold belt. Deformed fossils, sampled from Upper Devonian rocks in western New York, correspond to horizontal strain ellipses with axial ratios of as much as 1.5 and with long axes precisely parallel to the Appalachian fold trend. This strain is indicative of at least a 10% layer-parallel shortening normal (north-northwest) to the fold trend. Assuming a rigid basement, 10% layer-parallel shortening requires 5 km of displacement along a decollement thrust on the south-southeast side of any 50-km-wide portion of the affected area.

Original languageEnglish (US)
Pages (from-to)457-460
Number of pages4
JournalGeology
Volume5
Issue number8
DOIs
StatePublished - 1977

All Science Journal Classification (ASJC) codes

  • Geology

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