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Revision as of 16:19, 10 January 2010 by Woudloper(talk | contribs)(→Lithofacies: no external links in the text please. The German wiki has a good article on gaize btw)
The base of the Albian is defined as the place in the stratigraphic column where the coccolithophore species Praediscosphaera columnata first appears. A reference profile for the base of the Albian stage (its GSSP) had in 2009 not yet been established.
The top of the Albian stage (the base of the Cenomanian stage and Upper Cretaceous series) is defined as the place where the foram species Rotalipora globotruncanoides first appears in the stratigraphic column.[2]
The Albian is sometimes subdivided in Early/Lower, Middle and Late/Upper subages or substages. In western Europe, especially in the UK, a subdivision in two substages (Vraconian and Gaultian) is more often used.
A medium-sized nodosaurid, measuring about 5 meters (16.5 ft) long, Sauropelta had a distinctively long tail which made up about half of its body length. Its neck and back were protected by an extensive bony body armor including characteristically large spines
A nodosaurid estimated to have been approximately four meters in length (13 ft). Besides the usual rounded and polygonal osteoderms, Silvisaurus may have also sported bony spines on its shoulders and tail
An early hadrosauroid iguanodont, about 17 - 20 feet (5 - 6 metres) in length. It had a narrow snout, an elongated lower jaw and double rows of flattened cheek teeth. It was a possible ancestor of the duck-billed dinosaurs.
The following is a list of Ammonite genera whose fossils are geochronologically found first in lower Albian strata. These genera may survive into later portions of the Ablian stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included.
The following is a list of Ammonite genera whose fossils are geochronologically found first in middle Albian strata. These genera may survive into later portions of the Ablian stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included.
The following is a list of Ammonite genera whose fossils are geochronologically found first in upper Albian strata. These genera may survive into later portions of the Ablian stage, or even into later geological stages. This list should not be thought of in terms of the lifespan of the genera included.
Kennedy, W.J.; Gale, A.S.; Lees, J.A. & Caron, M.; 2004: The Global Boundary Stratotype Section and Point (GSSP) for the base of the Cenomanian Stage, Mont Risou, Hautes-Alpes, France, Episodes 27, pp. 21–32.
