Scratch circles: A new specimen from a lake-margin deposit of the passaic formation (Upper Triassic), Douglassville, Pennsylvania
A new occurrence of ancient scratch circles is documented from an Upper Triassic lake-margin deposit at Douglassville, Pennsylvania. Three partial scratch circles encompass a filled tube inferred to have been occupied by a plant stem. Water currents, via a sediment laden stream, likely shook the plant stem while the leaves were whirled around to create partial scratch circles. Sediment infilling followed by desiccation accounts for the preservation.
Northeastern Geology and Environmental Sciences
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Metz, Robert, "Scratch circles: A new specimen from a lake-margin deposit of the passaic formation (Upper Triassic), Douglassville, Pennsylvania" (1999). Kean Publications. 2783.