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Fig. 4 | Swiss Journal of Geosciences

Fig. 4

From: Reconciling strontium-isotope and K–Ar ages with biostratigraphy: the case of the Urgonian platform, Early Cretaceous of the Jura Mountains, Western Switzerland

Fig. 4

Microscopic investigations performed on the rhynchonellid brachiopod LRu4 (La Russille section; see Blanc-Aletru 1995, for description and location). a Pictures of the brachiopod LRu4; dash lines represent the orientation of the sections analysed; b, c SEM microphotographs of rhynchonellid LRu4 show good preservation of the fibrous structure of the secondary layer; d, e On cathodoluminescence microphotographs (e), the secondary layer of sample LRu4 is non-luminescent, whereas it is translucent in natural light (d), suggesting the absence of recrystallisation of the low-Mg calcite layer

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