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

Full text not available from this repository.

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:
CreatorsEmailORCIDORCID Put Code
Becker, Ralph ThomasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Klug, ChristianUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Soete, TillUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hartenfels, SvenUNSPECIFIEDorcid.org/0000-0002-2243-2096UNSPECIFIED
Aboussalam, Zhor SarahUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
El Hassani, AhmedUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
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:
KeywordsLanguage
ANTI-ATLAS; 1ST RECORD; ORIGIN; MOUNTAINS; GERMANY; EIFELMultiple languages
PaleontologyMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/15451

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item