Albian


The Albian is both an age of the geologic timescale and a stage in the stratigraphic column. It is the youngest or uppermost subdivision of the Early/Lower Cretaceous Epoch/Series. Its approximate time range is 113.2 ± 0.3 Ma to 100.5 ± 0.1 Ma. The Albian is preceded by the Aptian and followed by the Cenomanian.

Stratigraphic definitions

The Albian Stage was first proposed in 1842 by Alcide d'Orbigny. It was named after Alba, the Latin name for River Aube in France.
A Global Boundary Stratotype Section and Point, ratified by the IUGS in 2016, defines the base of the Albian as the first occurrence of the planktonic foraminiferan Microhedbergella renilaevis at the Col de Pré-Guittard section, Arnayon, Drôme, France.
The top of the Albian Stage is defined as the place where the foram species Rotalipora globotruncanoides first appears in the stratigraphic column.
The Albian is sometimes subdivided in Early/Lower, Middle and Late/Upper subages or substages. In western Europe, especially in the United Kingdom, a subdivision in two substages is more often used.

Examples

Examples of Albian sedimentary rock are: the phosphorite beds of the Argonne and Bray areas in France; the Flammenmergel of northern Germany; the lignites of Utrillas in Spain; the Upper Nubian Sandstones, and the Fredericksburg beds of North America.

Climate

Over the course of the Albian, the area in what is now the Liupanshan Basin, China became progressively hotter and drier.

Literature