Edited by oilshale
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Graphoceras concavum (Sowerby 1815)
Images: 
By Ludwigia (edited)
Taxonomy
Ammonite
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Ammonitida
Family: Graphoceratidae
Genus: Graphoceras
Species: Graphoceras concavum
Author Citation Sowerby 1815
Geological Time Scale
Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Middle
International Age: Late Aalenian
Stratigraphy
Achdorf Formation
Biostratigraphy
Concavum zone
Provenance
Collector: Roger Furze
Date Collected: 04/15/2001
Acquired by: Field Collection
Dimensions
Diameter: 10 cm
Location
Clay pit
Geisingen a. d. Donau
Baden-Wuerttemberg
Germany
Comments
This is the index fossil of the concavum zone. Most of the shell is preserved, as is a small portion of the body chamber. These ammonites could reach a good size, as shown by the sample in the last 2 photos, which has a circumference of 21cm.
Lithography: Geisingen-Oolith
The Geisingen-Oolith is a horizon which was built and reworked over a long stretch of time at the coastal fringe of an arm of the Tethys ocean. Fauna from both the concavum and the bradfordensis zones are to be found in it.
Old German Chronostratigraphy: Dogger (Braunjura) beta
Literature: Dietze et al (2014): Aalenian (Middle Jurassic) ammonites and stratigraphy of the Geisingen clay pit (SW Germany). Palaeodiversity 7: 61-127
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