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Swiss Journal of Geosciences
Fig. 7 | Swiss Journal of Geosciences

Fig. 7

From: A laboratory approach for the calibration of seismic data in the western part of the Swiss Molasse Basin: the case history of well Humilly-2 (France) in the Geneva area

Fig. 7

Optical photomicrograph of representative samples: a and b sample HU01; Upper Jurassic Carbonate section. A wide abundance of tubiphytes (TP), bryozoans (BZ), sponge/algae reefs (SG), and mollusca debris (mainly gastropods) were observed. Well-preserved longitudinal (LS) and transversal (TS) cross-sections of a high-spired gastropod show spar-infilled chambers and internal cavities, while the external outline is micritic sediment. Fractures (HF) were filled by a sparite cement. c sample HU07; Bathonian—bioclastic Mudstone-Wackstone unit. Bioclasts, including benthonic forams such as miliolids (MD), echinoderms and bioclastic algae (BA), are embedded in a micritic or peloidal calc-mud matrix; Diagenetic or post-depositional features including the formation of horsetail stylolites due to compaction were observed. d sample HU09; Bathonian—Benthic Crinoidal Packstone unit, where Benthonic Crinoidal (BC), bryozoa (BZ), and Lamellibranchs (LM) fragments representing the most abundant component. e sample HU12; Bajocian—Peloidal Packstone-Grainstone unit, showing abundance of foraminifers bioclasts (BF), algae (AG), peloids (PL) and few ooids (OD)

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