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Updated:Apr 23, 2026
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Meadowcroft Rockshelter stratigraphy, features, and dates (Pennsylvania) (c. 16,000–12,000 BP)

Meadowcroft Rockshelter stratigraphy, features, and dates (Pennsylvania) (c. 16,000–12,000 BP)

  1. Formation of the Meadowcroft rockshelter landform

    Labels: Meadowcroft rockshelter, Cross Creek, sandstone overhang

  2. Earliest disputed pre-Clovis occupation signals in lowest strata

    Labels: charcoal samples, pre-Clovis debate

  3. Lower Stratum IIa radiocarbon range anchors AUP levels

    Labels: Stratum IIa, American Upper

  4. Pre-Clovis cultural materials documented below later horizons

    Labels: pre-Clovis materials, stratified deposits

  5. Shift to well-dated Paleoindian and Clovis-era deposits

    Labels: Paleoindian deposits, Clovis-era

  6. Multi-period sequence continues through the Holocene

    Labels: Holocene sequence, stratigraphic units

  7. Site discovery via groundhog burrow artifacts

    Labels: Albert Miller, groundhog burrow

  8. Professional excavations begin under James M. Adovasio

    Labels: James M, University of

  9. Stratified sequence summarized in a major overview article

    Labels: American Antiquity, stratified sequence

  10. Meadowcroft added to the National Register of Historic Places

    Labels: National Register, Meadowcroft Rockshelter

  11. Radiocarbon chronology publication focuses debate on contamination

    Labels: radiocarbon chronology, contamination debate

  12. Meadowcroft designated a National Historic Landmark

    Labels: National Historic, Meadowcroft Rockshelter

  13. Stabilization work protects exposed stratigraphy for future study

    Labels: stabilization work, excavation conservation