Caenisites
| Caenisites | ||||||||||||
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| Temporal occurrence | ||||||||||||
| Sinemurium | ||||||||||||
| 196.5 to 189.6 million years | ||||||||||||
| Locations | ||||||||||||
| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Caenisites | ||||||||||||
| Buckman , 1925 | ||||||||||||
Caenisites is a genus of small to medium-sized ammonites . It is a key fossil in the outgoing sub-minemurium .
Initial description
The genus Caenisites was first scientifically described in 1925 by Sydney Savory Buckman .
Way of life
The individuals of the genus Caenisites were fast swimming marine carnivores .
Systematics
The genus Caenisites belongs to the family of Asteroceratidae (subfamily Asteroceratinae ) within the superfamily of Psiloceratoidea . The following taxa are known from her:
- Caenisites bordoti
- Caenisites brooki J. Sowerby , 1818
- Caenisites obtusiformis
- Caenisites pingue
- Caenisites plotti Vadász, 1908
- Caenisites pulchellus Guérin-Franiatte, 1966
- Caenisites sp.
- Caenisites subturneri
- Caenisites turneri J. C. Sowerby , 1824
A synonymous taxon is Euasteroceras Donovan, 1953
As a sister species act Aegasteroceras , Arctoasteroceras , Asteroceras , Bagnolites , Eparietites , Epophioceras , Euerbenites , Parasteroceras , Protechioceras , Ptycharietites and Tmaegophioceras .
Ammonite zone
The genus Caenisites is a key fossil in the Turneri zone (ammonite zone named after Caenisites turneri ) of the lower Sinemurian. The Turneri zone follows the semicostatum zone of the lower Sinemurium (named after Arnioceras semicostatum ). In turn, it is overlaid by the Obtusum Zone - the first ammonite zone of the Lotharingium or upper Sinemurium (named after Asteroceras obtusum ).
The Turneri zone is divided as follows (from hanging to lying ):
- Birchi subzone
- Bordoti Biozone
- Horizon from Caenisites bordoti
- Turneri Biozone
- Horizon from Caenisites subturneri
- Horizon Microderoceras Birchi
- Epophioceras pseudobonnardi horizon
- Horizon of Caenisites obtusiformis
- Bordoti Biozone
- Brooki subzone
- Brooki Biozone
- Horizon by Arnioceras hartmanni
- Horizon from Caenisites brooki
- Horizon of Sulciferites sulcifer
- Brooki Biozone
Occurrence
In the Jura of France the genus Caenisites is very well represented at Mavilly-Mandelot near Beaune ( Burgundy , Département Côte-d'Or ), almost all taxa are present here. In England the genus Caenisites appears near Glastonbury in Somerset and at Lyme Regis in Dorset . A classic site is in the Perșani Mountains north of Brașov in Romania .
Outside of Europe occurrences of the genus Caenisites from the Sierra de Álamos in the state of Sonora in Mexico are known. In British Columbia ( Canada ) the finds from the Taseko Lakes are worth mentioning.
literature
- WJ Arkell et al .: Mesozoic Ammonoidea. Treatise on Invertebrate Paleontology. Geological Society of America and University of Kansas Press, 1957.
Individual evidence
- ↑ JJ Sepkoski: A compendium of fossil marine animal genera . In: Bulletins of American Paleontology . tape 363 , 2002, p. 1-560 .
- ↑ Jean-Louis Dommergues and Stijn Goolaerts: Oxyarietites boletzkyi n. Gen., N. Sp., Nouveau genre et nouvelle espèce d'ammonite dans le sinémurien inférieur de Bourgogne (France): un rare précurseur des morphologies oxycônes pour le Jurassique . In: Geodiversitas . tape 34 (3) , 2012, p. 517-529 , doi : 10.5252 / g2012n3a4] .
- ↑ Kevin N. Page: High resolution ammonite stratigraphy of the Charmouth Mudstone Formation (Lower Jurassic: Sinemurian-Lower Pliensbachian) in south-west England, UK . In: Volumina Jurassica . Volume VII, p. 19-29 .
- ^ DT Donovan and S. von Boletzky: Loligosepia (Cephalopoda: Coleoidea) from the Lower Jurassic of the Dorset coast, England . In: New Yearbook of Geology and Paleontology, Treatises . tape 273 , 2014, p. 45-63 .
- ^ David G. Taylor, Jean Guex, and Milos Rakus: Hettangian and Sinemurian Ammonoid Zonation for the Western Cordillera of North America . In: Bull. Soc. vaud. Sc. nat. tape 87.4 , 2001, p. 381-421 .
- ↑ F. Macchioni, PL Smith and HW Tipper: Late early Sinemurian (early Jurassic) Ammonites from the Taseko Lakes map area, British Columbia . In: Palaeontology . tape 49 , 2006, pp. 557-583 .