The Cretaceous-Palaeogene boundary at Gorgonilla Island, Colombia, South America

Hermann D. Bermúdez, Jenny García, Wolfgang Stinnesbeck, Gerta Keller, José Vicente Rodríguez, Michael Hanel, Jens Hopp, Winfried H. Schwarz, Mario Trieloff, Liliana Bolívar, Francisco J. Vega

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Abstract

The discovery of a new Cretaceous/Palaeogene (K/Pg) bathyal marine sequence on Gorgonilla Island, SW Colombia, extends the presence of Chicxulub impact spherule deposits to the Pacific region of northern South America and to the Eastern Pacific Ocean. The Gorgonilla spherule layer is approximately 20 mm thick and consists of extraordinarily well-preserved glass spherules up to 1.1 mm in diameter. About 70-90% of the spherules are vitrified, and their chemical composition is consistent with Haiti (Beloc) impact glass spherules. Normal size-grading, delicate spherule textures, welded melt components and an absence of bioturbation or traction transport suggest that the Gorgonilla spherule layer represents an almost undisturbed settling deposit.

Original languageEnglish (US)
Pages (from-to)83-90
Number of pages8
JournalTerra Nova
Volume28
Issue number1
DOIs
StatePublished - Feb 1 2016

All Science Journal Classification (ASJC) codes

  • Geology

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    Bermúdez, H. D., García, J., Stinnesbeck, W., Keller, G., Rodríguez, J. V., Hanel, M., Hopp, J., Schwarz, W. H., Trieloff, M., Bolívar, L., & Vega, F. J. (2016). The Cretaceous-Palaeogene boundary at Gorgonilla Island, Colombia, South America. Terra Nova, 28(1), 83-90. https://doi.org/10.1111/ter.12196