Grain size of Cretaceous-Paleogene boundary sediments from Chicxulub to the open ocean; implications for interpretation of the mass extinction event

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doi: 10.1130/G30513.1
Author(s): Bralower, Timothy J.; Eccles, Laurie; Kutz, Justin; Yancey, Thomas; Schueth, Jon; Arthur, Michael A.; Bice, David
Author Affiliation(s): Primary:
Pennsylvania State University, Department of Geosciences, University Park, PA, United States
Texas A&M University, United States
Volume Title: Geology (Boulder)
Source: Geology (Boulder), 38(3), p.199-202. Publisher: Geological Society of America (GSA), Boulder, CO, United States. ISSN: 0091-7613 CODEN: GLGYBA
Note: In English. With GSA Data Repository Item 2010056. 26 refs.; illus.
Summary: The relationship between the Chicxulub impact event and the Cretaceous-Paleogene (K-Pg) boundary mass extinction has been repeatedly questioned. Specifically, Cretaceous planktonic foraminifera occurring in high-energy sediments in the Gulf of Mexico related to the impact have been used to argue that the impact preceded the mass extinction. Here we address this dispute by comparing grain size data from two Gulf of Mexico sections and a distal, pelagic sequence. Significantly larger grain sizes, combined with evidence for size sorting in the proximal sections, suggest that fossils in boundary deposits are redeposited and cannot be used to assign ages. Thus the grain size data support other evidence that indicates that high-energy deposits from around the Gulf of Mexico correlate stratigraphically with the Chicxulub impact and the K-Pg mass extinction.
Year of Publication: 2010
Research Program: ODP Ocean Drilling Program
Key Words: 12 Stratigraphy, Historical Geology and Paleoecology; Algae; Atlantic Ocean; Biostratigraphy; Cenozoic; Chicxulub Crater; Cores; Correlation; Cretaceous; Foraminifera; Grain size; Gulf of Mexico; High-energy environment; Invertebrata; K-T boundary; Leg 198; Lower Paleocene; Marine sediments; Mass extinctions; Mesozoic; Microfossils; Nannofossils; North Atlantic; North Pacific; Northwest Pacific; ODP Site 1212; Ocean Drilling Program; Pacific Ocean; Paleocene; Paleogene; Pelagic environment; Planktonic taxa; Plantae; Protista; Reworking; Sediments; Shatsky Rise; Stratigraphic boundary; Tertiary; Texas; United States; Upper Cretaceous; West Pacific
Coordinates: N322700 N322700 E1574300 E1574300
Record ID: 2010030919
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