Stephen P. Hesselbo, CHRISTIAN MEISTER, Darren R. Gröcke,
... tardecrescens horizons of latest Sinemurian age, and the Bifericeras donovani , and Apoderoceras gr. aculeatum horizons of earliest ... boundary is characterized by the faunal association of Bifericeras donovani Dommergues & Meister and Apoderoceras sp. Strontium-isotope ...
Tópico(s): Isotope Analysis in Ecology
2000 - Cambridge University Press | Geological Magazine
... UK). This level coincides with the ammonite association Bifericeras donovani Dommergues and Meister and Apoderoceras sp. which ...
Tópico(s): Evolution and Paleontology Studies
2010 - | Stratigraphy
C. R. C. Paul, Michael J. Simms,
... overgrew an epifaunal bivalve, and an example of Bifericeras which bears two clusters of four worm tubes, ...
Tópico(s): Isotope Analysis in Ecology
2011 - Elsevier BV | Proceedings of the Geologists Association
Abstract Large samples of pyritized ammonites of Bifericeras and Leptonotoceras from the Lower Jurassic of Bishop's Cleeve, Gloucestershire, England, reveal that the majority have asymmetrical suture lines due to siphuncular ... Leptonotoceras , but less frequent and less extreme in Bifericeras (92%, mean 5°, maximum 26° in B. bifer ; ... right. Trochospiral shells are more frequently found in Bifericeras bifer than in either Leptonotoceras or B . sp. ... the presence of at least two species of Bifericeras , but only one of Leptonotoceras , call into question ...
Tópico(s): Evolution and Paleontology Studies
2014 - Elsevier BV | Palaeogeography Palaeoclimatology Palaeoecology
María José Comas-Rengifo, António Goy, Laura Piñuela, José Carlos García-Ramos, Luis Carlos Suárez Vega, Ricardo Paredes,
... subcronozona, se registran asimismo escasos Paroxynoticeras y escasos Bifericeras y Gleviceras. En el aspecto paleobiogeográfico, la sucesión ...
Tópico(s): Geological formations and processes
2021 - Sociedad Española de Paleontología | Spanish Journal of Palaeontology