Short-Term Survival of Ammonites in New Jersey After the End-Cretaceous Bolide Impact

作者: Neil H. Landman , Matthew P. Garb , Remy Rovelli , Denton S. Ebel , Lucy E. Edwards

DOI: 10.4202/APP.2011.0068

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摘要: A section containing the Cretaceous/Paleogene (= Cretaceous/Tertiary) boundary in Monmouth County, New Jersey, preserves a record of ammonites extending from end Cretaceous into possibly beginning Danian. The includes upper part Tinton Formation and lower Hornerstown Formation. top is represented by richly fossiliferous unit (the Pinna Layer) that contains many bivalves life position as well ammonite jaws preserved inside body chambers. Ammonites include Pachydiscus (Neodesmoceras) mokotibensis, Sphenodiscus lobatus, Eubaculites carinatus, E. latecarinatus; Discoscaphites iris, D. sphaeroidalis; minardi, jerseyensis. Layer probably represents relatively short interval time lasting tens to hundreds years; it conformably overlain Burrowed Unit, which single fragment sp. several fragments latecarinatus, isolated specimens a...

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