The Coniacian is a stage of the Late CretaceousEpoch. It spans the time between 89.3 ± 1 Ma and 85.8 ± 0.7 Ma (million years ago). Faunal stages are a subdivision of geologic time used primarily by paleontologists who study fossils rather than by geologists who study rock formations. ... Geography of the US in the late Cretaceous Late Cretaceous (also called the Upper Cretaceous) refers to the second half of the Cretaceous period, named after the famous white chalk cliffs of southern England, which date from this time. ... The word epoch can mean either an interval of time, or a particular point in time used as a reference point. ... Annum is a Latin term meaning year. ...
In the Basco-Cantabrian Basin, Coniacian to Santonian sediments were deposited in a 5 myr.
The Upper Coniacian and Lower Santonian are contained within the lower shale, lower limestone, and middle shale units of the lower Smoky Hill Member of the Niobrara Formation.
Although Late Coniacian and Early Santonian inoceramids are common, taxonomically variable, and apparently rapidly evolving, the details of their vertical distribution are still not sufficiently known to propose a refined inoceramid-based biozonation.
Some Coniacian inoceramid species, in Europe, may have higher occurrences in far-east Asia, since Platyceramus mantelli (de Mercey) is known in Upper Coniacian and also "Santonian" together with I.
Biostratigraphical criteria for the recognition of the Coniacian to Maastrichtianstage boundaries in the Chalk of north-west Europe, with particular reference to southern England.
Coniacian and Santonian inoceramid bivalves froom the Gosau-Group (Cretaceous, Austria) and their biostratigraphic and palaeobiogeographic significance.
Feeds |
Contact