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Re: Oxfordian vertebrates are poorly known all over the world?

After more research, it seems Chile and Argentina vertebrates are either older or younger. Marine reptiles are known from Bajocian and Bathonian or in Tithonian beds, so there is indeed a lack in Oxfordian vertebrate fossil record in South America.

See this paper for more details (unfortunately, I don't have the complete version): http://www.weather.brockport.edu/~jmassare/rivp/Paludicola-Abs/Palud5%284%29Gasparini.pdf


Jocelyn Falconnet a écrit :

(Callovo-)Oxfordian vertebrates are far from being poorly known ! Marine fauna includes ichthyosaurs, thalattosuchians, plesiosaurs, turtles, dinosaurs, pterosaurs, and others and are world-widely distributed, as fossiliferous localities are known from Chile, Argentina, Cuba, United States (Wyoming, Montana, Dakota), and of course France and United Kingdom from which marine reptiles and dinosaurs are known since the beginning of the XIXth century - you know, Cuvier, Etienne Geoffroy Saint-Hilaire, Eudes-Deslongchamps Father & Son... Did I say that Cuvier and Geoffroy Saint-Hilaire were close friends before they had the opportunity to study the Normandy "Gavial de Honfleur" ? The first one thought these crocodiles were evidence for extinction of species, while the second saw them as ancestors of Extant crocodiles species. Anyway, the Oxfordian beds of the Anglo-Paris Basin played a major role in the history of paleontology.

The Oxford Clay and contemporaneous formations (upper Callovian-lower Oxfordian) of the Anglo-Paris Basin produced several theropods, ornithischians, ichthyosaurs, plesiosaurs, mesoeucrocodylians, actinopterygians, ... etc.

Actually, Middle Jurassic continental AND marine vertebrate fauna are much more poorly known... the fossil record is a bit better for the Callovian and Oxfordian, and becomes much better for the Kimmeridgian and Tithonian. In Western Europe, it is related to the global variations of the eustatic level of the sea.

See also: Gasparini Z. & Iturralde-Vinent M.A. 2004. Biogeography of the Cuban Oxfordian herpetofauna.
(Found the pdf on the web, but doesn't seem to have been published...)

2010/4/20 Ing. Yasmani Ceballos Izquierdo <yceballos@uci.cu <mailto:yceballos@uci.cu>>

    Dear colleagues,
    I trying to do a manuscript,
    and I want your opinion about this question
    Oxfordian vertebrates are poorly known all over the world?

Jocelyn Falconnet