Universität zu Köln

Becker, Ralph Thomas, Klug, Christian, Soete, Till, Hartenfels, Sven ORCID: 0000-0002-2243-2096, Aboussalam, Zhor Sarah and El Hassani, Ahmed (2019). The oldest ammonoids of Morocco (Tafilalt, lower Emsian). Swiss J. Palaeontol., 138 (1). S. 9 - 26. HEIDELBERG: SPRINGER HEIDELBERG. ISSN 1664-2384

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Abstract

During a fieldtrip of the 10th International Cephalopod Symposium to the Tafilalt (SE Morocco), a fauna with the so far oldest ammonoid of the region was discovered at the top of the basal Emsian Deiroceras Limestone of Jebel Mech Irdane. The new material confirms the record of a single, poorly preserved specimen of the same age from Ras El Kebbar in the northwestern Tafilalt. All specimens are assigned within the Chebbitinae n. subfam. (Mimosphinctidae) to Praechebbites debaetsi n. gen. n. sp., which differs from the slightly younger Chebbites reisdorfi mostly in the lack of a dorsal lobe and dorsal imprint zone. In the conodont succession, the new species and genus falls in the top of the Eolinguipolygnathus excacatus M114 Zone, which has been proposed to define in future the base of the Emsian. Since the new taxon is morphologically already advanced, it is likely that even older ammonoids with loosely coiled conchs will be discovered in the future. A block from a Lower Carboniferous olistostrome of the adjacent Tinerhir region contained the gyroconic Ivoites n. sp. only. The global comparison of oldest ammonoid faunas shows the rarity of assemblages assigned to Lower Devonian (LD) III-B, often dated by conodonts and dacryoconarids. These faunas display a high level of endemism, which suggests that ammonoid origin and early evolution took place in regional populations with a restricted dispersal of genera and species.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Becker, Ralph Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Klug, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Soete, Till UNSPECIFIED UNSPECIFIED UNSPECIFIED Hartenfels, Sven UNSPECIFIED orcid.org/0000-0002-2243-2096 UNSPECIFIED Aboussalam, Zhor Sarah UNSPECIFIED UNSPECIFIED UNSPECIFIED El Hassani, Ahmed UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-154513
DOI:	10.1007/s13358-019-00189-1
Journal or Publication Title:	Swiss J. Palaeontol.
Volume:	138
Number:	1
Page Range:	S. 9 - 26
Date:	2019
Publisher:	SPRINGER HEIDELBERG
Place of Publication:	HEIDELBERG
ISSN:	1664-2384
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ANTI-ATLAS; 1ST RECORD; ORIGIN; MOUNTAINS; GERMANY; EIFEL Multiple languages Paleontology Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/15451