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Showing results for tags 'upper greensand'.
Paleoworld-101 posted a topic in Questions & AnswersThis fossil crustacean was collected in England on the foreshore between Lyme Regis and Charmouth, amongst the algae-covered large boulders that are exposed at low tide. It looks to be in some kind of phosphatic nodule. The cream-colour of the matrix is quite unlike the dark Jurassic rocks that make this region famous. I was thinking it is unlikely to be from the Jurassic layers, and probably originates from the overlying Cretaceous sequences higher up in the cliffs? Both Gault Clay and Upper Greensand (Albian in age) unconformably sit above the Jurassic beds. Does anyone know which of these d