Age, stratigraphy, and deposition of near-K/T siliciclastic deposits in Mexico: Relation to bolide impact?

Research Article| April 01, 1997 Age, stratigraphy, and deposition of near-K/T siliciclastic deposits in Mexico: Relation to bolide impact? G. Keller; G. Keller 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544 Search for other works by this author on: GSW Google Scholar J. G. Lopez-Oliva; J. G. Lopez-Oliva 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544 Search for other works by this author on: GSW Google Scholar W. Stinnesbeck; W. Stinnesbeck 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544 Search for other works by this author on: GSW Google Scholar T. Adatte T. Adatte 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544 Search for other works by this author on: GSW Google Scholar Author and Article Information G. Keller 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544 J. G. Lopez-Oliva 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544 W. Stinnesbeck 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544 T. Adatte 1Department of Geosciences, Princeton University, Princeton, New Jersey 08544 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1997) 109 (4): 410–428. https://doi.org/10.1130/0016-7606(1997)109<0410:ASADON>2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation G. Keller, J. G. Lopez-Oliva, W. Stinnesbeck, T. Adatte; Age, stratigraphy, and deposition of near-K/T siliciclastic deposits in Mexico: Relation to bolide impact?. GSA Bulletin 1997;; 109 (4): 410–428. doi: https://doi.org/10.1130/0016-7606(1997)109<0410:ASADON>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Examination of 10 K/T boundary sections in northeastern and east-central Mexico, and new data presented from 7 sections, permit the following conclusions. (1) The globally recognized K/T boundary and mass extinction in planktic foraminifera is stratigraphically above, and separated by a thin marl layer of Maastrichtian age, from the siliciclastic deposit that is commonly interpreted as a short-term (hours to days) K/T-impact–generated tsunami deposit. A similar relationship between the K/T boundary and siliciclastic or breccia deposits is observed at Brazos River in Texas, Beloc in Haiti, and Poty Quarry in Brazil. (2) Stratigraphic control indicates that deposition of the siliciclastic member occurred sometime during the last 150 k.y. of the Maastrichtian, and ended at least several thousand years prior to the K/T boundary. (3) At least four discrete horizons of bioturbation have been observed within the siliciclastic deposit that indicate episodic colonization by invertebrates over an extended time period. (4) The glass- and spherule-rich unit, which has been linked to the Haiti spherule layer and the Chicxulub structure, is at the base of the siliciclastic deposit and thus significantly predates the K/T boundary event.The stratigraphic separation of the K/T boundary and siliciclastic deposits and the evidence of long-term deposition between them, suggests the presence of two events: (1) a globally recognized K/T boundary (impact) event marked by Ir anomaly and the mass extinction, and (2) a Caribbean event (impact or volcanic and probably linked to the Chicxulub structure) that predates the K/T boundary and is marked by glass and siliciclastic or breccia deposits. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.