[[file:applied-paleontology_fig17-32.png|thumb|{{figure number|17-32}}Printed with permission of Unocal; time scale after .<ref name=ch17r12 />]] | [[file:applied-paleontology_fig17-32.png|thumb|{{figure number|17-32}}Printed with permission of Unocal; time scale after .<ref name=ch17r12 />]] |