Cephalopod Upper Carboniferous
This Palaeozoic ammonoid has a goniatitic suture. The shell is inflated (cadicone) and the external surface is finely ribbed. The shell diameter is approximately 5 cm. Small tubercles line the margin of the moderately deep umbilicus. Gastrioceras is found in marine shales and is a useful zone fossil for the Upper Carboniferous.
Cephalopod Lower Jurassic
This ammonite is typically serpenticone and the external surface is ribbed (the shell diameter is approximately 6.5 cm). The body cavity is tubular and elongated. Numerical modeling has shown that the center of gravity and the center of buoyancy are very close together (see Fig. 9.15). This means that the ammonite could have adopted a number of floating orientations within the water column but would have lacked stability.
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