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Swiss Journal of Palaeontology
Fig. 1 | Swiss Journal of Palaeontology

Fig. 1

From: 3-D orientation and distribution of ammonites in a concretion from the Upper Cretaceous Pierre Shale of Montana

Fig. 1

a Map of AMNH loc. 3498 on the Cedar Creek Anticline, Dawson County, Montana. The dashed line indicates the shoreline during the time of deposition of the lower Maastrichtian Baculites baculus Zone. The Sheridan Delta extends into southeastern Montana (after Reiskind 1975). b Stratigraphic section of the study area (after Bishop 1973). The study concretion (arrow) occurs below a bentonite at the base of the B. baculus Zone

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