Exceptionally well preserved late Quaternary plant and vertebrate fossils from a blue hole on Abaco, the Bahamas

David W. Steadman, Richard Franz, Gary S. Morgan, Nancy A. Albury, Brian Kakuk, Kenneth Broad, Shelley E. Franz, Keith Tinker, Michael P. Pateman, Terry A. Lott, David M. Jarzen, David L. Dilcher

Research output: Contribution to journalReview article

69 Scopus citations

Abstract

We report Quaternary vertebrate and plant fossils from Sawmill Sink, a "blue hole" (a water-filled sinkhole) on Great Abaco Island, The Bahamas. The fossils are well preserved because of deposition in anoxic salt water. Vertebrate fossils from peat on the talus cone are radiocarbon-dated from ≈4,200 to 1,000 cal BP (Late Holocene). The peat produced skeletons of two extinct species (tortoise Chelonoidis undescribed sp. and Caracara Caracara creightoni) and two extant species no longer in The Bahamas (Cuban crocodile, Crocodylus rhombifer; and Cooper's or Gundlach's Hawk, Accipiter cooperii or Accipiter gundlachii). A different, inorganic bone deposit on a limestone ledge in Sawmill Sink is a Late Pleistocene owl roost that features lizards (one species), snakes (three species), birds (25 species), and bats (four species). The owl roost fauna includes Rallus undescribed sp. (extinct; the first Bahamian flightless rail) and four other locally extinct species of birds (Cooper's/Gundlach's Hawk, A. cooperii/gundlachii; flicker Colaptes sp.; Cave Swallow, Petrochelidon fulva; and Eastern Meadowlark, Sturnella magna) and mammals (Bahamian hutia, Geocapromys ingrahami; and a bat, Myotis sp.). The exquisitely preserved fossils from Sawmill Sink suggest a grassy pineland as the dominant plant community on Abaco in the Late Pleistocene, with a heavier component of coppice (tropical dry evergreen forest) in the Late Holocene. Important in its own right, this information also will help biologists and government planners to develop conservation programs in The Bahamas that consider long-term ecological and cultural processes.

Original languageEnglish (US)
Pages (from-to)19897-19902
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume104
Issue number50
DOIs
StatePublished - Dec 11 2007

Keywords

  • Birds
  • Crocodiles
  • Extinction
  • Islands
  • Tortoises

ASJC Scopus subject areas

  • General

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    Steadman, D. W., Franz, R., Morgan, G. S., Albury, N. A., Kakuk, B., Broad, K., Franz, S. E., Tinker, K., Pateman, M. P., Lott, T. A., Jarzen, D. M., & Dilcher, D. L. (2007). Exceptionally well preserved late Quaternary plant and vertebrate fossils from a blue hole on Abaco, the Bahamas. Proceedings of the National Academy of Sciences of the United States of America, 104(50), 19897-19902. https://doi.org/10.1073/pnas.0709572104