A sequence stratigraphic model of benthic foraminiferal facies trends with Triassic and Jurassic examples

Foraminiferal facies trends are outlined in a new sequence stratigraphic model embracing depositional conditions from alluvial plain to offshore shelf settings. The biofacies proxies include distribution of benthic species, faunal diversities and frequency of normal marine (contra restricted) taxa. In the transgressive–regressive framework, biofacies trends are portrayed as assemblage expansion and reduction separated by trend changes. Assemblage expansion means upward increase in diversity and frequency of normal marine taxa, while assemblage reduction means upward decrease of the same proxies.