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Swiss Journal of Palaeontology
Fig. 6 | Swiss Journal of Palaeontology

Fig. 6

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

Fig. 6

Cephalopod jaws in the concretion. a Tip of an upper jaw attributed to Hoploscaphites, dorsal view, AMNH 63600. b-d Upper jaw of a coleoid, AMNH 63601. b Right lateral view. c Dorsal view. d Left lateral view. e Lower jaw attributed to Hoploscaphites, dorsal view, AMNH 63602. f Lower jaw attributed to H. crassus, ventral view, with part of the left side broken off in preparation, AMNH 63603. g, h Lower jaw attributed to H. crassus, AMNH 64498. g Right lateral view, with hole produced by predation. j Close-up of hole. h Lower jaw attributed to Hoploscaphites, ventral view, AMNH 63604. i SEM of the microstructure of a lower jaw attributed to Hoploscaphites, AMNH 64512. The jaw consists of a black layer (left) originally composed of chitin, and a mineralized layer called the aptychus (right) originally composed of calcite

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