%0 Journal Article
%A Fernández López, Sixto Rafael
%A Meléndez Hevia, Guillermo
%T Abrasion surfaces on internal moulds of ammonites aspalaeobathymetric indicators
%D 1994
%@ 0031-0182
%U https://hdl.handle.net/20.500.14352/58486
%X Some abrasion surfaces displayed by internal moulds of ammonites, such as annular abrasion furrows formed onthe venter surface and ellipsoidal abrasion facets preferentially developed on the last third part of the preserved whorl,are diagnostic criteria of taphonomic reworking. These taphonomic criteria indicate that the internal moulds havebeen exhumed and moved before their final burial. We explain the origin of these abrasion surfaces by the action ofdirectional (non oscillatory) currents in very shallow water, most probably in intertidal environments. The distributionof ammonite moulds displaying such preservational features is correlated with the changes in the facies and the trendof the sedimentary sequences. Taphonomic analysis of Jurassic ammonites of the Iberian Range underlines theimportance and usefulness of taphonomic gradients in sequence stratigraphy and palaeogeographic reconstructions.
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