Age, distribution and composition of Miocene diatom bearing sediments in the Guadalquivir Basin, Spain

Bustillo, Ma Ángeles; García, Ma José López

doi:10.1016/s0016-6995(97)80193-3

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…7). However, the record of C. megalodon is congruent in a context as the North Betic Strait where high productivity is reported (Molina et al, 1987;Bustillo & López-García, 1997) favorable for marine mammals, also recorded in the same basin (Reolid et al, 2014).…”

Section: Palaeoecologymentioning

confidence: 66%

“…The narrowing of the strait from the Langhian to the Tortonian could have caused the progressive upwelling deduced from the study of the diatomites. This narrowing could also explain the evolution of the upwelling from open sea conditions to near shore conditions (Bustillo & López-García, 1997).…”

Section: Geological Settingmentioning

confidence: 94%

“…The main diatom assemblages consist mostly of planktic (Thalassionema, Thalassiotrix, Thalassiosira) and scarce benthic (Delphineis) forms typical of cold oceanic upwelling waters (Molina et al, 1987;López-García & Bustillo, 1994). The outcrops belong to the third and last episode of diatomitic sedimentation defined in this area by Bustillo & López-García (1997) of the Thalassiosira yabei Zone (Middle Tortonian).…”

Section: Geological Settingmentioning

confidence: 99%

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Record of <em>Carcharocles megalodon</em> in the Eastern Guadalquivir Basin (Upper Miocene, South Spain)

Reolid

Molina

2015

Estud. geol.

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Tortonian diatomites of the San Felix Quarry (Porcuna), in the Eastern Guadalquivir Basin, have given isolated marine vertebrate remains that include a large shark tooth (123.96 mm from apex to the baseline of the root). The large size of the crown height (92.2 mm), the triangular shape, the broad serrated crown, the convex lingual face and flat labial face, and the robust, thick angled root determine that this specimen corresponds to Carcharocles megalodon. The symmetry with low slant shows it to be an upper anterior tooth. The total length estimated from the tooth crown height is calculated by means of different methods, and comparison is made with Carcharodon carcharias. The final inferred total length of around 11 m classifies this specimen in the upper size range of the known C. megalodon specimens.The palaeogeography of the Guadalquivir Basin close to the North Betic Strait, which connected the Atlantic Ocean to the Mediterranean Sea, favoured the interaction of the cold nutrient-rich Atlantic waters with warmer Mediterranean waters. The presence of diatomites indicates potential upwelling currents in this context, as well as high productivity favouring the presence of large vertebrates such as mysticetid whales, pinnipeds and small sharks (Isurus). These large vertebrates recorded in the Eastern Guadalquivir Basin were potential prey of C. megalodon. Keywords: Carcharocles megalodon; fossil tooth; Guadalquivir Basin; Tortonian. RESUMENLas diatomitas tortonienses de la antigua Cantera de San Félix (Porcuna, Jaén), en el sector oriental de la Cuenca del Guadalquivir, han proporcionado restos aislados de vertebrados marinos entre los que destaca un gran diente de tiburón (123.96 mm desde el ápice hasta la línea basal de la raiz). La altura de la corona (92.2 mm), su forma triangular con bordes aserrados, la presencia de una cara lingual convexa y una labial plana, conjuntamente con la raíz angulosa y robusta, permiten determinar que este diente perteneció a un ejemplar de Carcharocles megalodon. La alta simetría de la pieza, su tamaño y su relación longitud/anchura de la corona permiten afrimar que se trata de un diente superior anterior. La longitud total estimada para este tiburón, es calculada a partir de diferentes métodos basados principalmente en la comparación con el tiburón blanco Carcharodon carcharias. La longitud total inferida finalmente para este ejemplar ronda los 11 m, lo que permite incluir este ejemplar dentro del rango de los ejemplares de C. megalodon de gran tamaño.

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Section: Palaeoecologymentioning

confidence: 66%

Section: Geological Settingmentioning

confidence: 94%

Section: Geological Settingmentioning

confidence: 99%

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Record of <em>Carcharocles megalodon</em> in the Eastern Guadalquivir Basin (Upper Miocene, South Spain)

Reolid

Molina

2015

Estud. geol.

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“…2 20-15 Separation of Corsica from Sardinia (Alvarez et al, 1974;Orsini et al, 1980). 3 16-14 Opening of the Betic sea strait separated the south Iberian Betic region from the continent (Bustillo and Lopes Garcıa, 1997;Lonergan and White, 1997). 4 ca.…”

Section: Discussionmentioning

confidence: 99%

Testing alternative vicariance scenarios in Western Mediterranean discoglossid frogs

Fromhage

Vences

Veith

2004

Molecular Phylogenetics and Evolution

111

102

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Dated molecular phylogenies are often used to interpret evolutionary history with respect to paleogeographic events. Where more than one interpretation is possible, it is desirable but difficult to assess the alternatives in an objective manner. The present work demonstrates a formalized method for testing molecular clock calibrations and biogeographic scenarios based on them. We assessed the plausibility of several previously published biogeographic hypotheses, using the frog genera Alytes, Discoglossus, and Bombina as model groups. Our data set comprised ca. 900 bp of partial mitochondrial 16S and 12S rRNA gene sequences (both genes evolved in a clock-like manner across genera) from nearly all the species and subspecies in the three genera. We tested several calibrations of a molecular clock, which resulted in competing temporal settings for the evolution of taxa. Although only one scenario was in complete accordance with paleogeographic data, statistical testing did not reject the alternatives. Limitations encountered with the present approach may be overcome by more comprehensive analyses in future.

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“…Yanagisawa & Akiba 1990). The possibility that a few specimens of the genera Cruzidenticula and Denticulopsis have been reworked and redeposited into Upper Miocene sediments in the Lorca Basin is supported by finds of Crucidenticula nicobarica, C. punctata and Denticulopsis hustedtii as dominant species in the sediments of the Guadalquivir Basin (SW Spain) reported by Bustillo & L6pez Garcia (1997).…”

Section: Abundance Of Siliceous Micro Fossil Groupsmentioning

confidence: 99%

Environmental changes in pre-evaporitic Late Miocene time in the Lorca Basin (SE Spain): diatom results

Jurkschat

Fenner

Renate

et al. 2000

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During the Late Miocene the Lorca Basin, which was an integrated part of the Betic Strait, underwent desiccation. The present investigation was completed to determine the response of the diatom flora to environmental changes before this event. Near the city of Lorca (Province of Murcia, SE Spain) the outcrop area around the Serrata ridge was studied and a stratigraphic section of 125m has been measured and sampled (115 samples). The Serrata ridge is capped by a 25m thick gypsum bed (Gypsum Member of the Serrata Formation). The profile below these gypsum layers comprises marl, sandstone, gypsum and partially laminated diatomite (Varied Member of the Serrata Formation). The frequency of radiolaria, siliceous sponge spicules, siticoflagellates, ebridians, diatoms and diatom species has been determined quantitatively. For the lower 87.5m of the section, which contains sufficiently well preserved diatoms, an

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Age, distribution and composition of Miocene diatom bearing sediments in the Guadalquivir Basin, Spain

Cited by 11 publications

References 12 publications

Record of <em>Carcharocles megalodon</em> in the Eastern Guadalquivir Basin (Upper Miocene, South Spain)

Record of <em>Carcharocles megalodon</em> in the Eastern Guadalquivir Basin (Upper Miocene, South Spain)

Testing alternative vicariance scenarios in Western Mediterranean discoglossid frogs

Environmental changes in pre-evaporitic Late Miocene time in the Lorca Basin (SE Spain): diatom results

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