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Stratotype Cénomanien [French]

Geology Guide
By: Nicolas Morel(Author), Patrick De Wever(Foreword By)
383 pages, colour & b/w photos, colour & b/w illustrations, and colour & b/w maps, includes CD-ROM
Stratotype Cénomanien [French]
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  • Stratotype Cénomanien [French] ISBN: 9782856537756 Paperback Sep 2015 In stock
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About this book

Language: French

The poor and sandy soils of the French Le Mans region have enabled the development of heaths, which are nowdays overgrown with resinous trees. Brooms, plants belonging to the tribe Genisteae, a tribe of evergreen, semi-evergreen, and deciduous shrubs in the subfamily Faboideae of the legume family Fabaceae, are shrubs typical of this environment. In the twelfth century they became the emblem of the counts of Maine, nicknamed the Plantagenets. This dynasty reigned thereafter over England. These rulers were surprised to discover that their name was related to sand deposits dated to about 100 million years.

The Le Mans region (Cenomanum) was chosen by Alcide d'Orbigny in 1847 as a new type of Cretaceous geological stage which is now the international benchmark of the Cenomanian stage. The goal of this book is firstly to discover the history of the study of the Cenomanian. Historic sites, most of which are now inaccessible, are also described. Secondly, the stratotype region is decrypted in order to understand the sequence of geological formations that make up the local Cenomanian, and then place them in the Paris Basin, and even more broadly around the world. An important part of this volume is devoted to the paleontology of the stratotype which is largely responsible for its selection by Orbigny. Some fossil groups, including molluscs, crustaceans and echinoderms are exceptionally rich. Finally, the stratotype Cenomanian, for its sites and collections, is an indisputable part of France's national geological heritage.

Summary in French:
Les sols sableux et pauvres de la région du Mans ont permis le développement de landes, aujourd’hui enrésinées. Le genêt, arbuste typique de ce milieu, est devenu au XIIe siècle l’emblème des comtes du Maine, surnommés les Plantagenêts. Cette dynastie régna par la suite sur l’Angleterre. Ces souverains auraient été étonnés de découvrir que leur nom était lié à des dépôts sableux datés de près de 100 millions d’années.

La région du Mans (Cenomanum) a été choisie par Alcide d’Orbigny en 1847 comme le type d’un nouvel étage géologique du Crétacé qui constitue aujourd’hui la référence internationale de l’étage Cénomanien. L’ambition de cet ouvrage est dans un premier temps de faire découvrir l’histoire de l’étude du Cénomanien. Les sites historiques, dont la plupart sont aujourd’hui inaccessibles, sont également décrits. Dans un deuxième temps, la région stratotypique est décryptée afin de comprendre l’enchaînement des formations géologiques qui constituent le Cénomanien local puis de les replacer au sein du Bassin parisien, voire plus largement à l’échelle mondiale. Une part importante de ce volume est consacrée à la paléontologie du stratotype qui est en grande partie à l’origine de sa sélection par d’Orbigny. Certains groupes fossiles, notamment les mollusques, les crustacés et les échinodermes, sont d’une richesse exceptionnelle. Enfin, le stratotype Cénomanien, par ses sites et ses collections, est un élément indiscutable du patrimoine géologique national.

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Geology Guide
By: Nicolas Morel(Author), Patrick De Wever(Foreword By)
383 pages, colour & b/w photos, colour & b/w illustrations, and colour & b/w maps, includes CD-ROM
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