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Middle Cambrian fossils from Tizi N'Tichka, the High Atlas, Morocco. Part 1. Introduction and trilobites (1997)

Geyer, Gerd ; Malinky, John M.

Paleontological Society

In: Journal of Paleontology. 1997; 71(4): 620-637. Published 1997 Jul 01. doi: 10.1017/s0022336000040117.

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Publikationsdatum: 1997-07-01

Beschreibung: New finds of the trilobitesCobboldites tichkaensisGeyer, 1988,Pseudocobboldia pulchra(Hupé, 1953),Protolenus(Protolenus)densigranulatusGeyer, 1990,Latoucheia(Latoucheia)tichkaensisHupé, 1953, andAcanthomicmacca neltneriHupé, 1953, from the basal Middle Cambrian near the peak of Tizi n'Tichka in the central High Atlas, Morocco, supplement the known morphology of these species; the trilobitesAcanthomicmaccanew species,Oreisator tichkaensisnew genus and species, and“Parasolenopleura”sp. from that locality are new.Acanthomicmacca neltneriis the first species of the genus and family that is described and figured in detail in terms of morphologic plasticity and ontogeny;Oreisator tichkaensisis the first ptychopariacean trilobite formally described and based on material from Africa. Trilobites and other fossils from the locality suggest a strong affinity to other Mediterranean and to Avalonian faunas, which is well supported by helcionelloid and hyolith genera.

Print ISSN: 0022-3360

Digitale ISSN: 1937-2337

Thema: Geologie und Paläontologie

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Neltneriidae and Holmiidae (Trilobita) from Morocco and the problem of Early Cambrian intercontinental correlation (1995)

Geyer, Gerd ; Palmer, Allison R.

Paleontological Society

In: Journal of Paleontology. 1995; 69(3): 459-474. Published 1995 May 01. doi: 10.1017/s0022336000034867.

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Publikationsdatum: 1995-05-01

Beschreibung: Previously undescribed Holmiidae from the Sectigena Zone of Morocco indicate correlation of this zone with other zones bearing Holmiidae on Baltica, Avalonia, Siberia, and Laurentia. The occurrence of the youngest Antatlasiinae in the Sectigena Zone and the oldest Protoleninae in the overlying Hupeolenus Zone suggests correlations of the Sectigena Zone with upper Atdabanian beds bearing the youngest Antatlasiinae and the Hupeolenus Zone with Botomian beds bearing the oldest Protoleninae in Siberia. The occurrence, in the overlying Hupeolenus and Cephalopyge Zones, of Paradoxides s.l. in association with the olenelloid Cambropallas and with trilobites characteristic of the Lower Cambrian “Protolenus” Zone of Avalonia calls into question the major criteria for recognition of strata of Early and Middle Cambrian age. New taxa include lyouella contracta n. gen. and sp. of the Holmiidae and Bondonella sdzuyi n. sp. of the Neltneriidae. The known species of Neltneria, N. jacqueti and N. termieri, are revised.

Print ISSN: 0022-3360

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Thema: Geologie und Paläontologie

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An unusual new lepidopleurid polyplacophoran (Mollusca) from the Germanic Muschelkalk (Triassic) (1990)

Geyer, Gerd ; Kukla, Peter A.

Paleontological Society

In: Journal of Paleontology. 1990; 64(2): 222-228. Published 1990 Mar 01. doi: 10.1017/s0022336000018382.

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Publikationsdatum: 1990-03-01

Beschreibung: A fragmentary and probably immature polyplacophoran shell from the Middle Triassic Germanic Muschelkalk is presented. Morphological peculiarities of the specimen are a stiff connection of the head valve to the adjoining intermediate valve and the presence of a yet undescribed brim-like shell constituent, informally called border-plate herein. The unusually well-preserved shell structure is discussed in detail comprising tegmentum, crossed-lamellar p. hypostracum and the (articulamental?) border-plate. Characteristics indicate a systematic position within the order Lepidopleurina.

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Thema: Geologie und Paläontologie

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Protorthacean brachiopods from the Middle Cambrian of Morocco (1997)

Geyer, Gerd ; Mergl, Michal

Paleontological Society

In: Journal of Paleontology. 1997; 71(5): 791-812. Published 1997 Sep 01. doi: 10.1017/s0022336000035745.

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Publikationsdatum: 1997-09-01

Beschreibung: Protorthacean brachiopods from the Middle Cambrian of the Moroccan Atlas regions are described in terms of morphology and systematic affinities. The superfamily Protorthacea is revised to include both Protorthidae and Bohemiellidae. Newly introduced is the protorthid genus Saesorthis, the morphologic characteristics as well as the significance of which are discussed in detail together with their bearing on early phylogeny of the Orthacea. A reinvestigation of Brahimorthis antiqua led to the recognition of additional morphologic peculiarities and enhances understanding of its stratigraphic occurrence. Additional descriptions and discussions deal with informally described protorthid and bohemiellid species. Bohemiella and Jamesella are reported from Africa for the first time.

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Thema: Geologie und Paläontologie

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Middle Cambrian fossils from Tizi N'Tichka, the High Atlas, Morocco. Part 2. Hyolitha (1997)

Marek, Ladislav ; Malinky, John M. ; Geyer, Gerd

Paleontological Society

In: Journal of Paleontology. 1997; 71(4): 638-656. Published 1997 Jul 01. doi: 10.1017/s0022336000040129.

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Publikationsdatum: 1997-07-01

Beschreibung: Shelly fossils from the basal Middle Cambrian, near the peak of Tizi n'Tichka in the central High Atlas, Morocco, include the new hyolithids Oboedalites peregrinus new species, Emarites decorissimus new genus and species, Patholites insolitus new genus and species, Rodentilites cricetus new genus and species, Slapylites afer new species, Tajinella mosei new genus and species, and Tizilites creber new genus and species. New orthothecid hyoliths are Gracilitheca destombesi new species, Contitheca chrosniaki new species, Sysoievia exilis new genus and species and an indeterminate species of Circotheca. The presence of Obeodalites, Slapylites, and Contitheca suggests a strong affinity to other Mediterranean and to Avalonian faunas. Their occurrence in Morocco extends their geographic ranges from Europe, and further reenforces their usefulness as indicators of Middle Cambrian age.

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Thema: Geologie und Paläontologie

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Cambrian corynexochid trilobites from Morocco (1994)

Geyer, Gerd

Paleontological Society

In: Journal of Paleontology. 1994; 68(6): 1306-1320. Published 1994 Nov 01. doi: 10.1017/s0022336000034296.

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Publikationsdatum: 1994-11-01

Beschreibung: Corynexochid trilobites of the Cambrian of Morocco are described and the subfamily Acontheinae is revised. With Kootenia beethoveni n. sp., Kootenia spp. indet., Strettonia sp. A, Clavigellus annulus n. gen. and sp., and gen. et sp. incert., the Moroccan Corynexochida comprise only a few forms that are almost exclusively restricted to the High Atlas Mountains. Biogeographical relationships are weak; strong relationships may exist with the faunas of the Shropshire area as already exemplified by some eodiscid and ellipsocephalid taxa.

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Thema: Geologie und Paläontologie

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A new obolellid brachiopod from the Lower Cambrian of Morocco (1994)

Geyer, Gerd

Paleontological Society

In: Journal of Paleontology. 1994; 68(5): 995-1002. Published 1994 Sep 01. doi: 10.1017/s0022336000026603.

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Publikationsdatum: 1994-09-01

Beschreibung: A new genus and species of obolellid brachiopod, Brevipelta chouberti, is described from the Early Cambrian of Morocco. It is a useful index fossil for the upper Choubertella Zone and the Daguinaspis Zone in Morocco. Additionally discussed are taphonomic aspects that lead to the question whether the shell may have been weakly calcified compared to other obolellid brachiopods and the calcareous part may have been composed of aragonite crystallites, or whether the preservation of Brevipelta is due to facile solubility of a calcitic shell substance. Brevipelta chouberti represents not only the oldest described Early Cambrian brachiopod from Africa, but one of the oldest obolellid brachiopods known worldwide.

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Thema: Geologie und Paläontologie

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An enigmatic bilateral fossil from the Lower Cambrian of Morocco (1994)

Geyer, Gerd

Paleontological Society

In: Journal of Paleontology. 1994; 68(4): 710-716. Published 1994 Jul 01. doi: 10.1017/s0022336000026147.

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Publikationsdatum: 1994-07-01

Beschreibung: Disklike, firm, bilaterally symmetrical fossils recovered from the middle Lower Cambrian Amouslek Formation of the Moroccan Anti-Atlas are described under the name Microschedia amphitrite n. gen. and sp. Their systematic affinity, particularly to brachiopods and cnidarians, and resemblance to existing taxa are discussed. Although interpretation as a brachiopod appears to be more convincing, their morphology does not permit a precise determination of systematic position.

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Thema: Geologie und Paläontologie

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