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Cleviceras Exaratum
''Cleviceras'' is an extinct genus of cephalopod belonging to the family Hildoceratidae. These cephalopods existed in the Jurassic period, during Toarcian and possibly even uppermost Pliensbachian age.M. K. Howarth 2013. Treatise on Invertebrate Paleontology, Part L, Revised, Volume 3B, Chapter 4: Psiloceratoidea, Eoderoceratoidea, Hildoceratoidea.KAMATA, Yoshihito; MIZOBE, Shin-Ichi; SATO, Tadashi. An Early Jurassic ammonite from a limestone conglomerate in the Kuzu Complex of the Ashio Belt. Paleontological Research, 2003, 7.3: 185-194. Sometimes, it is considered to be a synonym of '' Eleganticeras''.Marc BÉCAUD (2006) LES HARPOCERATINAE, HILDOCERATINAE ET PARONICERATINAE DU TOARCIEN DE LA VENDÉE ET DES DEUX-SÈVRES (FRANCE). Etymology Genus is named after Cleveland, and area in north England. Fossils of ''Cleviceras exaratum'', type species of this genus are very abundant there.M. K. Howarth 1992. HILDOCERATIDAE IN THE LOWER JURASSIC OF BRITAIN Distribution Fossils of speci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Early Jurassic
The Early Jurassic Epoch (geology), Epoch (in chronostratigraphy corresponding to the Lower Jurassic series (stratigraphy), Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic–Jurassic extinction event, 201.3 Ma (million years ago), and ends at the start of the Middle Jurassic 174.7 ±0.8 Ma. Certain rocks of marine origin of this age in Europe are called "Lias Group, Lias" and that name was used for the period, as well, in 19th-century geology. In southern Germany rocks of this age are called Black Jurassic. Origin of the name Lias There are two possible origins for the name Lias: the first reason is it was taken by a geologist from an England, English quarryman's dialect pronunciation of the word "layers"; secondly, sloops from north Cornwall, Cornish ports such as Bude would sail across the Bristol Channel to the Vale of Glamorgan to load up with rock from coastal limestone quarries (lias and Carbonif ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
