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Macintosh Picture Format  |  1996-09-10  |  294.4 KB  |  640x480  |  8-bit (248 colors)
   ocr: 8 - Ammonites - - ALTHOUGH RELATIVELY SIMPLE IN FORM, AMMONITES ARE extremely rich in the information they yield to scientists. This extinct marine animal, which thrived in the Paleozoic and Mesozoic Eras, some four hundred million to sixty-five million years ago, was a cephalopod like the modern squid, octopus, cut- tlefish, and nautilus. An ammonite's shape affected its locomotion. Like modern nautiluses, spiral ammonites moved by jet propulsion, squirting water to propel themselves backward or 113 2XX93X332399900BMAAUMIANENCRLBE90840000404024HABLLECEEAUEN 00227003900004DNMOUMVUAUNNOUNCUN