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Christian Klug:

Quantitative stratigraphy and taxonomy of late Emsian and Eifelian ammonoids of the eastern Anti-Atlas (Morocco)

2002. 109 pages, 44 figures, 23 tables, 13 plates, 21x30cm, 520 g
Language: English

(Courier Forschungsinstitut Senckenberg, Band 238)

ISBN 978-3-510-61344-1, paperback, price: 23.00 €

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Keywords

devonianstratigraphyammonoid

Contents

Synopsis top ↑

Sixteen late Emsian and Eifelian sections (Early and Middle Devonian) in the Tafilalt (eastern Anti-Atlas, Morocco), several previously undescribed, were investigated, figured, and described. In order to develop a coherent stratigraphical scheme based on ammonoids, the method of graphic correlation was applied to 14 highly fossiliferous sections in the study area. This produced an ammonoid range chart based on the Tafilalt Regional Composite and the stratigraphical subdivision of the included sections. The conclusions were tested by comparing them with a lithostratigraphical correlation of the sections. Consequently, the following stratigraphical succession of the late Emsian to Eifelian ammonoid faunas in the Tafilalt is suggested: Latanarcestes noeggerathi Unit, Sellanarcestes wenkenbachi Unit, Anarcestes lateseptatus Unit, Foordites veniens Unit, Pinacites jugleri Unit, Subanarcestes macrocephalus Unit, Cabrieroceras crispiforme Unit, Cabrieroceras housei Unit, Agoniatites vanuxemi Unit, Parodiceras magnosellaris Unit, Agoniatites obliquus Unit, Holzapfeloceras circumflexiferum Unit. The family Pinacitidae and the genera Fidelites, Pinacites, Exopinacites, Sellanarcestes, Paranarcestes, Werneroceras, Crispoceras, Cabrieroceras, and Subanarcestes are revised and the following new genera are introduced: Achguigites gen. n., Pseudofidelites gen. n., Parafidelites gen. n., Mimotornoceras gen. n., Wendtia gen. n., and Diallagites gen. n.

Keywords: Graphic correlation, Ammonoidea, Early Devonian, Middle Devonian, Tafilalt, Morocco

Inhaltsbeschreibung top ↑

Sechzehn Profile der späten Ems- und Eifel-Stufe (Frühes und Mittleres Devon) im Tafilalt (östlicher Anti-Atlas, Marokko), von denen mehrere bisher unveröffentlicht waren, wurden dargestellt und deren Litho- und Biostratigraphie beschrieben. Um ein kohärentes stratigraphisches Schema basierend auf Ammonoideen zu erstellen, wurde die Methode der graphischen Korrelation auf 14 fossilreiche Profile des Untersuchungsgebietes angewandt. Eine Reichweiten-Tabelle, welche auf dem Tafilalt Regional Composite gründet und die stratigraphische Unterteilung der späten Ems- und Eifel-Stufe in den Profilen sind die wichtigsten Ergebnisse dieser Untersuchung. Diese wurden getestet durch einen Vergleich mit einer lithostratigraphischen Korrelation. Folgende stratigraphische Abfolge von Ammonoideen-Faunen aus der späten Ems- und Eifel-Stufe wird für den Tafilalt vorgeschlagen: Latanarcestes noeggerathi Unit, Sellanarcestes wenkenbachi Unit, Anarcestes lateseptatus Unit, Foordites veniens Unit, Pinacites jugleri Unit, Subanarcestes macrocephalus Unit, Cabrieroceras crispiforme Unit, Cabrieroceras housei Unit, Agoniatites vanuxemi Unit,Parodiceras magnosellaris Unit, Agoniatites obliquus Unit, Holzapfeloceras circumflexiferum Unit.

Table of Contents top ↑

Introduction 2
Material and remarks on the sections 3
Terms and abbreviations used in the systematic part 4
Localities 5
Northern Tafilalt 5
Ras El Kebbar 5
Gara Mdouara 5
Jebel Amelane 5
Erfoud Bordj Est 7
Gart El Anz 7
Bou Tchrafine West and East 7
Rich Haroun 9
Hamar Laghdad 9
Achguig West and East 11
Hassi Tachbit 12
Hassi Chebbi West 12
Ouidane Chebbi 12
Oued Chebbi East/Mkarig 12
Southern Tafilalt 13
Jebel Mech Irdane South 13
El Kachla 13
Rich Tamirant 15
Jebel Ouaoufilal West and East 15
Hassi Nebech 15
Hassi Moudaras 17
Lithostratigraphy 17
Late Emsian marls 17
Late Emsian nodular limestones 18
Early Eifelian claystones and nodular limestones of the ChotecÇ Event level 18
Early Eifelian ammonoid and dacryoconarid packstones 18
Early to middle Eifelian nodular limestones 19
Middle Eifelian nodular limestones and thick-bedded limestones 19
Late Eifelian nodular limestones, marls, and claystones 19
Latest Eifelian marls, claystones, and limestone nodules of the KacÇák Event level 19
Early Givetian massive and nodular limestones 19
Biostratigraphy 20
Graphic correlation 20
Method 20
Included data 21
Standard Reference Section (SRS) 21
Line of Correlation (LOC) 21
Rounds of Correlation 21
Results 21
Discussion 25
Ammonoid succession 26
Latanarcestes noeggerathi Unit; inversus to serotinus conodont Zone 26
Sellanarcestes wenkenbachi to Anarcestes lateseptatus Unit; serotinus to
partitus conodont Zone 27
Foordites veniens to Pinacites jugleri Unit; partitus to earliest costatus
conodont Zone ..... 27
Pinacites jugleri Unit; early costatus conodont Zone 28
Subanarcestes macrocephalus and Cabrieroceras crispiforme Unit; early to
middle costatus conodont Zone 28
Cabrieroceras housei Unit; middle to late costatus conodont Zone 28
Agoniatites vanuxemi, Parodiceras magnosellaris, and A. obliquus Unit; latest
costatus to eiflius conodont Zone 28
Holzapfeloceras circumflexiferum Unit; ensensis to timorensis conodont Zone 28
Holzapfeloceras circumflexiferum and Sellagoniatites discoides Unit; ensensis
to timorensis conodont Zone 29
Systematic Palaeontology 29
Order Agoniatitida RUZHENCEV 1957 29
Suborder Agoniatitina RUZHENCEV 1957 29
Superfamily Mimagoniatitaceae MILLER 1938 29
Family Mimagoniatitidae MILLER 1938 29
Amoenophyllites CHLUPÁCÇ & TUREK 1983 29
Superfamily Agoniatitaceae HOLZAPFEL 1899 29
Family Agoniatitidae HOLZAPFEL 1899 29
Fidelites CHLUPÁC & TUREK 1983 29
Achguigites gen. n. 33
Pseudofidelites gen. n. 34
Parafidelites gen. n. 35
Family Pinacitidae HYATT 1900 36
Subfamily Foorditinae subfam. n. 36
Mimotornoceras gen. n. 37
Subfamily Pinacitinae HYATT 1900 (nom. transl. Pinacitidae HYATT 1900) 38
Pinacites MOJSISOVICS 1882 38
Exopinacites CHLUPÁCÇ & TUREK 1983 41
Suborder Anarcestina MILLER & FURNISH 1954 42
Superfamily Anarcestaceae STEINMANN 1890 42
Family Anarcestidae STEINMANN 1890 42
Sellanarcestes SCHINDEWOLF 1933 42
Paranarcestes CHLUPÁCÇ & TUREK 1983 48
Werneroceratidae ERBEN 1964 49
Werneroceras WEDEKIND 1918 49
Diallagites gen. n. 50
Crispoceras CHLUPÁCÇ & TUREK 1983 54
Cabrieroceras BOGOSLOVSKY 1958 57
Wendtia gen. n. 59 Family Sobolewiidae HOUSE 1989 60
Subanarcestes SCHINDEWOLF 1933 60
Conclusion 66
Acknowledgements 67
References 67
Plates 75 Appendix 1: Tables 1-23 102
Appendix 2: Species 108