Edited by oilshale
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Stephanoceras humphresianum (Sowerby 1825)
Images: 
By Ludwigia (edited)
Taxonomy
Ammonite
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Ammonitida
Family: Stephanoceratidae
Genus: Stephanoceras
Species: Stephanoceras humphresianum
Author Citation Sowerby 1825
Geological Time Scale
Eon: Phanerozoic
Era: Mesozoic
Period: Jurassic
Sub Period: None
Epoch: Middle
International Age: Middle Bajocian
Stratigraphy
Passwang Formation
Brueggli Member
Biostratigraphy
humphresianum zone
Provenance
Collector: Roger Furze
Date Collected: 04/09/2013
Acquired by: Field Collection
Dimensions
Diameter: 14.5 cm
Location
Ruenenberg
Sissach
Canton Basel
Switzerland
Comments
Lithography: "Humphresie-Bank/Schichten"
Old German Chronostratigraphy: Dogger(Braun Jura) delta
This ammonite is the index fossil for its zone. It has an anomaly which can clearly be seen on the outer whorls at 9 o'clock. The external side is then exposed more than usual until it returns to normal at 3 o'clock. The small remnant of shell from the outer whorl of the body chamber from thereon shows how large the ammonite actually was.
Literature: Ottiger,R. (2014): Fossiliensuche im Tafeljura. Verlag Dr. Friedrich Pfeil.
Burkhalter,R.M. (1996): Die Passwang Alloformation im zentralen und noerdlichen Schweizer Jura. Eclogae geol. Helv. 89/3: 875-934.
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