Parkinsonia parkinsoni
| Parkinsonia parkinsoni | ||||||||||||
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Parkinsonia parkinsoni from the Winnberg quarry , Franconian Alb . |
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| Temporal occurrence | ||||||||||||
| Upper Upper Bajocium | ||||||||||||
| 168 million years | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Parkinsonia parkinsoni | ||||||||||||
| ( Sowerby , 1821) | ||||||||||||
Parkinsonia parkinsoni is a Jurassic ammonite species from the Parkinsoniidae familythat lived in the Upper Upper Bajocium around 168 million years ago.
features
In the cross-section, Parkinsonia parkinsoni appears somewhat flattened, the individual turns showing a rectangular-oval cross-section. With an opening width of the case of 2.7 centimeters, it can reach a diameter of around 13 centimeters. The ribs are clearly pronounced, the ribs are sharp, are relatively far apart and run in a straight line to the outer edge. Before reaching the edge, the ribs separate into two strands over two thirds of the way. They end at a narrow, sharply defined and centrally located furrow on the outside. In the direction of growth, the ribs go up to the peristome (opening of the housing) and remain even into the adult stage. Occasionally there may also be lateral extensions.
etymology
The ammonite Parkinsonia parkinsoni was scientifically described for the first time in 1821 by the English naturalist James Sowerby . Genus and species names go back to the English botanist John Parkinson .
Occurrence
Locations of Parkinsonia parkinsoni in Germany, the Franconian Jura ( Sengenthal ) and the Swabian Alb ( Eningen ). Also in France in the north near Bayeux (type locality) and in the south-east ( Drôme , Hérault ). Other sites are in England , Poland , Russia ( Crimea ), Scotland , Switzerland (Cantons Basel-Landschaft and Solothurn ) and the Ukraine ( Donets Basin ). Outside Europe in Azerbaijan , the Caucasus , Iran and North Africa .
Ammonite zone
The ammonite Parkinsonia parkinsoni is in the stratigraphy an important index fossil in the Tethyalen area. The uppermost of the seven ammonite biozones of the Bajocium, the Parkinsonia parkinsoni zone, was named after him .
literature
- Rudolf Schlegelmilch : The ammonites of the southern German mastiff. An identification book for fossil collectors and geologists. Fischer, Stuttgart et al. 1985, ISBN 3-437-30488-7 .
Web links
- Naturkundemuseum BW: naturkundemuseum-bw.de . Volker Dietze, Günter Schweigert (2000): On the stratigraphy and ammonite guidance of the Upper Bajocian and Bathonian, in particular the Zigzag Zone, Convergens Subzone, of Röttingen (eastern Swabian Alb, southwest Germany) . In: Stuttgart contributions to natural history. Ser. B, No. 284. Stuttgart, June 27, 2000. (PDF file; 388 kB)