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...

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