ammonoids Definition

ammonite, permian, mesozoic, most, devonian, cretaceous, nautiloids, conodonts, brachiopods, bivalves, genera, distribution, are, were, became, occur, include, known, ammonites, amphibians, anthropoids, auxiliary, bryozoans, cephalopods, crinoids, dinosaurs, echinoids, eocene, evaporites, faunas, floras, fossils, gymnosperms, jurassic, marginal, marsupials, protoconch, tetrapods, trilobites, vertebrates,