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Swiss Journal of Geosciences
Fig. 9 | Swiss Journal of Geosciences

Fig. 9

From: New paleontological and biostratigraphical data (calcareous nannofossils, ostracods, brachiopods), correlations and lithostratigraphic units in the Urgonian facies (latest Hauterivian-Barremian) of the Swiss and French Jura Mountains: the Falaises Member and the Saars Formation (former “Gorges de l’Orbe Formation”)

Fig. 9

Sections in the Valserine Valley (southern Jura Mountains). a Bellegarde-sur-Valserine railway station section, upper Vallorbe Formation with yellow–brown paleosol marked by molds of rootlets and two layers of brackish/lacustrine marls (1, 2) characterized by Late Barremian microfossils (charophytes, ostracods). b Musinens section, upper Vallorbe Formation with oblique irregular paleokarst surface (between U1 and U2) and Late Barremian marly infilling (marls of Poet Beds) with orbitolinids and marine ostracods. c Rocher des Hirondelles section with steep cliff of thick massive Rocher des Hirondelles Formation (RHF). d Pont-des-Pierres section, dark shallow and bioturbated marly limestones (B2) with limonite, detrital quartz and Early Barremian ostracods. e, f Basal Rocher des Hirondelles section with nodular and pseudoconglomeratic marly limestones (B1, B2) at the northern tunnel entry (D991 Road). Captions: VF: Vallorbe Formation; U1–U2: units of the upper Vallorbe Formation (cf. Pictet et al., 2016, 2019); PBm: marls of Poet Beds; MM: Montcherand Member; B1–B2: Early Barremian deeply bioturbated and brecciated deposits (B1: lower layer; B2: upper layer). For the reported ostracod assemblages (colored circles 2, 4), see Figs. 10 and 11. The hammers are 31.5 cm (a, b: red frame; d) and 37.5 cm long (e, f)

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