Agenium (geology)
Agenium is a regional stage in the terrestrial neogene of Europe. It corresponds to zones MN 1 and 2 of the European land mammal chronology ( ELMMZ = "European Land Mammal Mega-Zones"). It is overlaid by the Orleanium and underlain by the Arvernium of the highest regional level of the terrestrial paleogene .
History and type locality
The step is named after the French city of Agen , near which the type locality is located.
definition
The lower limit is defined by the onset of the large mammal genus Hyotherium , for small mammals it is the genus Vasseuromys and the species Rhodanomys schlosseri . The upper limit (and thus the beginning of the Orleanium ) is defined by the first appearance of Gomphotherium , Procervulus , Lagomeryx , Actoocemas , Palaeomeryx , Brachyodus , Anchitherium , Aureliachoerus , Hemicyon (large mammals). The agenium is the chronostratigraphic stage of Aquitanium correlated. In geochronology, this corresponds to the period from 23 to 20.4 million years.
Breakdown
The stage is divided into two bio-zones, MN 1 and MN 2. The level is accordingly divided into Lower and Upper Agenium.
literature
- J. Agustí, L. Cabrera, M. Garcés, W. Krijgsman, O. Oms, JM Parés: A calibrated mammal scale for the Neogene of Western Europe. State of the Art. Earth Science Reviews, 52: 247-260, Amsterdam 2001 ISSN 0012-8252
- Everett Lindsay: Eurasian mammal biochronology: an overview. Palaeogeography, Palaeoclimatology, Palaeoecology, 133: 117-128, Amsterdam 1997 ISSN 0031-0182