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Vicedo V.,Museu de Ciencies Naturals de Barcelona Paleontologia | Berlanga J.A.,PEMEX | Serra-Kiel J.,University of Barcelona | Caus E.,Autonomous University of Barcelona
Journal of Foraminiferal Research | Year: 2013

This paper revises the architecture of the Paleocene foraminiferal genus Taberina based on reexamination of the type species, T. cubana, from Cuba, supplemented by specimens collected from the Lacandón Formation of SE Mexico. Taberina shells exhibit an initial subglobular shape, later becoming conical to peneropliform. They have multiple apertures and the stolon axes follow a radial pattern. Structural elements consist of septula situated in the peripheral part of the chamber lumen and thick, irregularly shaped pillars located in the central part. The architecture of typical Taberina differs from those of other "taberinas" described from the Middle East, such as the Cenomanian "T". bingistani and Paleocene "7." daviesi, both of which must be removed from the genus. Other taxa of larger benthic foraminifers found in the Lacandón Formation include: Ranikothalia bermudezi, "Quasiborelis" floridanus, Rhabdoritesl sp., Praerhapydionina sp., Miscellanea? nassauensis, Neomurciella cf. N. butterlini, Raadshoovenia guatemalensis, and rotaliids. The age of T. cubana is Paleocene SBZ 2 and SBZ 3, and the species is known only from the Caribbean/American paleobioprovince.

Piuz A.,Museum dhistoire naturelle de la Ville de Geneva | Meister C.,Museum dhistoire naturelle de la Ville de Geneva | Vicedo V.,Museu de Ciencies Naturals de Barcelona Paleontologia
Cretaceous Research | Year: 2014

The first alveolinoidean appearing in the Cenomanian Natih Formation of Oman (Adam foothills and southern edge of Jabal Akhdar) are studied in detail. Morphological analysis results in the creation of one new family, Myriastylidae, two new genera, Myriastyla and Alveocella, and four new species, M.omanensis, M.grelaudae, A.wernliana, and Cisalveolina nakharensis. These four new taxa have a short stratigraphic extension restricted to the uppermost part of Natih E unit and are dated early middle Cenomanian by neighboring foraminifers and ammonite levels. © 2014 Elsevier Ltd.

Gonzalez-Fernandez B.,University of Oviedo | Menendez-Casares E.,University of Oviedo | Vicedo V.,Museu de Ciencies Naturals de Barcelona Paleontologia | Aramburu C.,University of Oviedo | Caus E.,Autonomous University of Barcelona
Journal of Iberian Geology | Year: 2014

Detailed mapping of the Jurassic to pre-Albian deposits of central and eastern Asturias (NW of the Iberian Peninsula) allowed several Upper Jurassic and Lower Cretaceous outcrops, previously assigned to other ages, to be identified. Where possible, these outcrops were correlated with the well-known sequences outcropping on the Asturian coast. A new Jurassic stratigraphic unit, the Miyares Formation, was defined, consisting of a conglomerate Lower Unit, a Middle Unit composed mainly of oolitic limestones and an Upper Unit comprising bioclastic and marly limestones with a rich larger foraminiferal fauna. The Lower Unit is interpreted as deposited in a fan delta, the Middle Unit represents a shallow marine high-energy environment, and the Upper Unit deposited on a restricted shallow marine platform. The shallow-water foraminiferal assemblage from the Upper Unit is attributed to the Tithonian and the oldest Cretaceous rocks are Barremian. Therefore, there is a stratigraphic gap recorded in the study area, which might correspond to the latest Jurassic to Early Cretaceous pro parte timespan. © 2014, Universidad Complutense de Madrid. All rights reserved.

Vicedo V.,Museu de Ciencies Naturals de Barcelona Paleontologia | Berlanga J.A.,PEMEX | Serra-Kiel J.,University of Barcelona
Carnets de Geologie | Year: 2014

The larger foraminifera found in the material from the Chichen Itzá Formation of Campeche (SE Mexico) were studied in detail. The architectural analyses allow the description of four new species and a new genus, namely, two agglutinated conical foraminifera, Coskinolina yucatanensis n.sp. and Pseudofallotella drobneae n. gen. n.sp., one new alveolinid, Borelis hottingeri n.sp., and one new rota-liid, Dictyoconoides boneti n.sp. The larger foraminifera of the Chichen Itzá Formation are distributed across two different associations: one includes Pseudofallotella drobneae, Neotaberina sp., Rhabdorites sp., Borelis hottingeri, Dictyoconoides boneti, Kathina sp., Miscellaneidae, Ranikothalia soldadensis and Hexagonocyclina cristensis, while the other assemblage is composed of Coskinolina yucatensis, Fallotel-la causae, Rhabdorites sp., Borelis floridanus and Cincoriola cf. ovoidea. Some of these genera, inclu-ding Neotaberina and Dictyoconoides, are cited in the Caribbean paleobioprovince for the first time in this paper. The first association is dated as Thanetian (SBZ 3? to SBZ 4) by the presence of Ranikotha-lia soldadensis. Though the age of the second association remains uncertain, a similar age has been in-ferred.

Vicedo V.,Museu de Ciencies Naturals de Barcelona Paleontologia | Serra-Kiel J.,University of Barcelona
Journal of Foraminiferal Research | Year: 2015

A deep architectural analysis of the Paleocene, porcelane- ous larger foraminifera Taberina daviesi Henson, 1950 has been conducted for the first time, which has permitted clarification of its generic taxonomic attribution and a more accurate assessment of its palaeobiogeographical and bio- stratigraphical distributions. The crosswise oblique pattern followed by the stolon axes in T. daviesi differs from the radial pattern showed in the type species of the genus Taberina, T. cubana Keijzer, 1945. Moreover, differences in the embryonic architecture and the type of growth and final test shape between these species support a change in the generic taxonomic attribution. Thus, a new genus, Azzar- olina, is proposed for the former species. Azzarolina daviesi is a common biostratigraphic marker for the Paleocene with a broad distribution in the Arabian Peninsula and surrounding areas.

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