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Slumping and a sandbar deposit at the Cretaceous-Tertiary boundary in the El Tecolote section (northeastern Mexico): An impact-induced sediment gravity flow: COMMENT

¹ Department of Geosciences, Princeton University, Princeton, New Jersey 08544, USA
² Geologischal Institute, University of Karlsruhe, 75128 Karlsruhe, Germany
³ Geological Institute, University of Neuchatel, CH-2007 Neuchatel, Switzerland

The first 20% of the full text of this article appears below.

Soria et al. (2001) report on slump features in a spherule deposit of the El Tecolote outcrop in northeastern Mexico and interpret this as evidence of widespread destabilization and collapse of the continental margin as a result of the Chicxulub impact. They further conclude that multiple spherule layers in northeastern Mexico are therefore likely slump induced. Though unattributed, the reference is to the recent discovery of three to four spherule layers in the late Maastrichtian Méndez Formation of northeastern Mexico (Stinnesbeck et al., 2001), which are interpreted as one or more latest Maastrichtian impact events, or a pre–Cretaceous-Tertiary (K-T) impact followed by repeated reworking of the original spherule deposit.

Soria et al.'s database consists of two closely spaced sections in the La Sierrita area, which they call El Tecolote. Our database in the same area includes over 20 stratigraphic sections, including El Tecolote (also called Mesa Juan Pérez), and an additional 17 sections to the southeast (Los dos Plebes, La Sierrita, Loma Cerca). This extensive database leads us to dismiss the collapsed margin hypothesis, as well as a Cretaceous-Tertiary . . . [Full Text of this Article]

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