Late Maastrichtian age of spherule deposits in northeastern Mexico: implication for Chicxulub scenario

Stinnesbeck, W.; Schulte, P.; Lindenmaier, F.; Adatte, T.; Affolter, M.; Schilli, L.; Keller, G.; Stüben, D.; Berner, Z.; Kramar, U.; Burns, S.; Lopez-Oliva, J.