DescriptionSilica pseudomorph after gypsum crystals and silicified serpulid polychaete tubes.jpg
English: On the edges of the Tethys during the Lower Cretaceous the Urgonian carbonate platform has undergone significant variations in sea level.
During periods of low sea level, sub aerial exposure areas appeared and in very shallow bodies of water, the salts precipitated.
This sample comes from one of these very shallow bodies of water.
Crystals are silica pseudomorph after gypsum.
Fossils are silicified serpulid (Polychaeta) tubes.
Stage : Aptian, Lower Cretaceous
Locality : Provence, South-East France
Français : Sur les bords de la Téthys durant le Crétacé Inférieur la plateforme carbonatée urgonienne a subit d'importantes variations du niveau marin.
Durant les périodes de bas niveau marin sont apparus des zones émergées et dans les étendues d'eau très peu profonde, les sels ont précipité.
Cet échantillon provient de l'une de ces étendue d'eau très peu profonde.
Les cristaux sont des pseudomorphoses : silice après gypse.
Les fossiles sont des tubes de serpules (Polychaeta) silicifiés.
Etage : Aptien, Crétacé Inférieur
Localité : Provence, sud est de la France
English: Silica pseudomorph after gypsum crystals and silicified serpulid polychaete tubes
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Captions
Silica pseudomorph after gypsum crystals and silicified serpulid tubes
Pseudomorphose de cristaux de gypse en silice et tubes de serpules silicifiés