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Swiss Journal of Palaeontology
Fig. 2 | Swiss Journal of Palaeontology

Fig. 2

From: Geochemical evidence (C and Sr isotopes) for methane seeps as ammonite habitats in the Late Cretaceous (Campanian) Western Interior Seaway

Fig. 2

Invertebrate fossils from the methane seep at AMNH loc. 3418, Custer County, South Dakota. a Baculites corrugatus, mature macroconch, showing a series of small scalloped edges along the entire length of the body chamber (arrows), probably reflecting predation. b Nymphalucina occidentalis. c Crassatella evansi. d Crinoid columnal showing canals. e Baculites corrugatus, whorl cross section showing septum. f Spiroxybeloceras meekanum. g “Inoceramus” sagensis. h Hoploscaphites brevis, juvenile. i Drepanochilus trilirata. j Didymoceras cheyennense. k Lower jaw attributed to Hoploscaphites. l Hoploscaphites brevis, mature microconch. Scale bar at bottom applies to all specimens except a, d, h, and k (modified from Landman et al. 2012; AMNH specimen numbers are given in Landman et al. 2012)

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