Occurrences of the ammonite genus Clydoniceras Blake, 1905 in the Middle Jurassic (Upper Bathonian, Discus Zone) of NW Switzerland

Two ammonites of the genus ClydonicerasBlake, 1905, are described and figured for the first time from the Upper Bathonian of NW Switzerland. One specimen is from the Ächtelmatt site near Anwil (Canton Basellandschaft). The complex depositional conditions, especially those during the Late Bathonian,...

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Bibliographic Details
Published in:Proceedings of the Geologists' Association 2016-05, Vol.127 (2), p.218-229
Main Authors: Dietze, Volker, Hostettler, Bernhard
Format: Article
Language:English
Subjects:
Anwil
Bathonian
Callovian
Clydoniceras discus
Ifenthal Formation
St-Brais Member
Switzerland
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Summary:Two ammonites of the genus ClydonicerasBlake, 1905, are described and figured for the first time from the Upper Bathonian of NW Switzerland. One specimen is from the Ächtelmatt site near Anwil (Canton Basellandschaft). The complex depositional conditions, especially those during the Late Bathonian, of this famous section are discussed. The second specimen comes from a road cut at La Gainaiche, north St-Brais (Canton Jura). The St-Brais Member (formerly Calcaire roux sableux) within the Ifenthal Formation is introduced.
ISSN:0016-7878
DOI:10.1016/j.pgeola.2015.11.002