Valanginian (Early Cretaceous) ammonite faunas from the western High Atlas, Morocco, and the recognition of western Mediterranean ‘standard’ zones

Wippich, Max G.E.

doi:10.1016/s0195-6671(03)00049-1

Cited by 31 publications

(14 citation statements)

References 8 publications

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“…Although BULOT (1995) convincingly justified the choice of K. inostranzewi as index of this unit, ATROPS & REBOULET (1995a) had already retained K. biassalense to characterize the uppermost unit of their lower Valanginian biostratigraphic scheme. This option was subsequently followed by WIPPICH (2001WIPPICH ( , 2003 and ETTACHFINI (2004), and integrated in the standard zonation proposed by HOEDEMAEKER et al (2003). We agree with BULOT (1995) in considering K. biassalense unsuitable to characterize this stratigraphic interval.…”

Section: Discussionsupporting

confidence: 74%

“…This misinterpretation of N. neocomiensiformis underlies the widespread use of "Busnardoites" campylotoxus to characterize the entire middle and upper parts of the lower Valanginian (COTILLON, 1971;BUSNARDO & THIEULOY, 1979a, 1979bHOEDE-MAEKER, 1982;HOEDEMAEKER & BULOT, 1990;ATROPS & REBOULET, 1995a;HOEDEMAEKER et al, 2003). By contrast, several authors (BULOT, 1995;WIPPICH, 2001WIPPICH, , 2003ETTACHFINI, 2004) have emphasized that true "B." campylotoxus has a much shorter stratigraphic range, limited to the interval corresponding to our Valanginites dolioliformis Subzone.…”

Section: Definition and Characterizationmentioning

confidence: 99%

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Lower Valanginian ammonite biostratigraphy in the Subbetic Domain (Betic Cordillera, southeastern Spain)

Tavera

2015

Carnets Geol.

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A new zonation for the lower Valanginian in the Betic Cordillera is presented. It is based on the study of 16 sections located near Caravaca and Cehegín (Region of Murcia). From bottom to top, the following interval zones, defined by the first appearance of the index-species, are distinguished: • "Thurmanniceras" pertransiens Zone, which can be subdivided into two subzones, a lower "Th." pertransiens Subzone and an upper Vergoliceras salinarium Subzone. The latter is characterized by the disappearance of Olcostephanus drumensis and the appearance of Luppovella superba. • Neocomites neocomiensiformis Zone, also with two subzones, the Baronnites hirsutus Subzone below (characterized by the appearance of "Busnardoites" subcampylotoxus and Olcostephanus guebhardi) and the Valanginites dolioliformis Subzone above ("Busnardoites" campylotoxus is restricted to this subzone). • Karakaschiceras inostranzewi Zone, subdivided as well into two subzones, a lower Karakaschiceras inostranzewi Subzone and an upper Saynoceras contestanum Subzone. The assemblages characterizing each of these biozones can be recognized throughout the Mediterranean region.

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Section: Discussionsupporting

confidence: 74%

Section: Definition and Characterizationmentioning

confidence: 99%

Lower Valanginian ammonite biostratigraphy in the Subbetic Domain (Betic Cordillera, southeastern Spain)

Tavera

2015

Carnets Geol.

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“…In the Atlantic Atlas of Morocco, marly–limestone alternations become marlier towards the Lower/Upper Valanginian boundary and pass abruptly into argillaceous marls above this limit (Ettachfini et al. , 1998; Wippich, 2003; Fig. 18A), as observed in the Vocontian Basin (Fig.…”

Section: Discussionmentioning

confidence: 76%

“…Sea-level fall at the Early/Late Valanginian boundary Numerous sedimentary basins illustrate sea-level trends similar to those seen for the Valanginian of the Peri-Vocontian Zone; this is particularly true for the sea-level fall that occurred before the Early/ Late Valanginian boundary. In the Atlantic Atlas of Morocco, marly-limestone alternations become marlier towards the Lower/Upper Valanginian boundary and pass abruptly into argillaceous marls above this limit (Ettachfini et al, 1998;Wippich, 2003; Fig. 18A), as observed in the Vocontian Basin (Fig.…”

Section: Worldwide Record Of Valanginian Sea-levelmentioning

confidence: 94%

Sea-level reconstructions from the Peri-Vocontian Zone (South-east France) point to Valanginian glacio-eustasy

Gréselle¹,

Pittet²

2010

Sedimentology

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International audienceThe Valanginian is a period of global environmental change as illustrated by sedimentary, palaeontological, geochemical and climatic perturbations. A production crisis in most of the carbonate platforms suggests important changes in palaeoenvironmental conditions. During the same time interval, a major positive excursion in delta 13C, the Weissert Event, suggests perturbations of the carbon cycle from the latest Early Valanginian to the Early Hauterivian. In order to better understand the link between these changes, sea-level fluctuations have been reconstructed in detail from the Middle Berriasian to the earliest Hauterivian. Sections from the Peri-Vocontian Zone (South-east France) have been investigated because of the good quality of outcrops on the carbonate platforms, their margins and in the Vocontian Basin. Sections ranging from the most proximal zone (Swiss Jura) to the basin were interpreted in terms of sequence stratigraphy and cyclostratigraphy, and correlated at high resolutions. Using the identified small, medium and large-scale sequences as well as depositional geometries, sea-level fluctuations were reconstructed. Two main trends are evidenced during the studied interval: (i) the peak amplitude (magnitude) of the sea-level fluctuations increased gradually from the Middle Berriasian to the Early Valanginian, and reached a maximum (more than 50 m) from the middle Early Valanginian to the Valanginian/Hauterivian boundary; and (ii) sea-level variations were quite symmetrical during the Late Berriasian, slightly asymmetrical during the Early Valanginian and strongly asymmetrical (fast sea-level rise, slow fall) from the latest Early Valanginian to the earliest Hauterivian. Moreover, three orders of sea-level fluctuations were recognized in the sedimentary rocks of the Peri-Vocontian Zone. Platform-basin correlations and cyclostratigraphic interpretations of the basinal sections evidence an astronomical control on the sea-level variations, mainly by the two eccentricity cycles of 100 and 400 kyr. The increase in the amplitude of the sea-level fluctuations and their change from symmetrical to asymmetrical can be related to the onset of a major cooling event in the Early Valanginian. Fast transgressions followed by slower regressions would correspond to waxing and waning of high-latitudinal ice during most of the Valanginian, especially from the latest Early Valanginian to the latest Late Valanginian. Glacio-eustatic sea-level fluctuations in tune with the 100 and 400 kyr eccentricity cycles are in agreement with glaciations during the Valanginia

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“…Este género ha sido reconocido en el Valanginiano inferior a Hauteriviano inferior de numerosos países de Europa (Company 1987, Bulot 1990, 1992, Lukeneder 2004, Cáucasos y Crimea (Karakasch 1902, Druschitchs y Kudryastev 1960, Pakistán (Spath 1939, Fatmi 1977, India (Spath 1939, Pathak et al 2011, norte de África (Roch 1930, Memmi 1965, Wippich 2003, Sudáfrica (Kitchin 1908, Spath 1930, Madagascar (Besairie 1936, Colligon 1962, Estados Unidos (Texas) (Young 1988), Méjico (Böse 1923, Imlay 1937, González-Arreola et al 1995, Cantú-Chapa 2009, Colombia (Riedel 1938, Royo y Gómez 1945, Bürgl 1957, Haas 1960, Etayo-Serna 1968, Perú (Lisson 1907, Rivera 1951, Chile (Mourgues 2004), Argentina (Gerth 1925, Weaver 1931, Leanza 1958, Riccardi et al 1971, Leanza y Wiedmann 1980, Aguirre-Urreta y Rawson 1999 a) y Antártida (Howlett 1986) (fig. 3.1).…”

Section: Comentarios: Olcostephanus Neumayr Es Un Género De Amplio Raunclassified

Sclerobionts, Shell Morphology and Biostratinomy on Ammonites: Two Early Cretaceous Cases From the Neuquén Basin, Argentina

Luci

Cichowolski

Aguirre-Urreta

2016

PALAIOS

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Valanginian (Early Cretaceous) ammonite faunas from the western High Atlas, Morocco, and the recognition of western Mediterranean ‘standard’ zones

Cited by 31 publications

References 8 publications

Lower Valanginian ammonite biostratigraphy in the Subbetic Domain (Betic Cordillera, southeastern Spain)

Lower Valanginian ammonite biostratigraphy in the Subbetic Domain (Betic Cordillera, southeastern Spain)

Sea-level reconstructions from the Peri-Vocontian Zone (South-east France) point to Valanginian glacio-eustasy

Sclerobionts, Shell Morphology and Biostratinomy on Ammonites: Two Early Cretaceous Cases From the Neuquén Basin, Argentina

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