Figure 13.21   Life attitudes and buoyancy of the ammonites. (a) Supposed life orientations of a selection of ammonite genera, with the center of gravity marked ; the center of buoyancy is marked with a dot and the extent of the body chamber is indicated with subparallel lines. (b) Relationship of some ammonite morphotypes to water depth and the development of anoxia. (a, from Trueman, A.E. 1940. Q. J. Geol. Soc. Lond. 96; b, from Batt 1993.)

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