Paleontology of the Jurassic and Cretaceous of West Central Argentina

Agassiz Agrio formation Ammonites angle anteriorly Aptien Argentina basal margin beds Behrendsen Beilageband Beitraege Belt body whorl brownish gray Burckhardt Callovien carina Central Neuquen Cerro Loteno Chos Malal clay shale costae Cretaceous Crioceras cross section curves d'Orbigny Dogger dorsal margin elongate Fauna figs flank fossils Genus Geologic Range Gerth Gryphaea height Holotype interbedded interspaces Jaworski Jurassic kilometers left valve limestone lines of growth lithology locality 127 Los Molles lower Malargue marginal carina meters moderately narrow Neocomien neuquensis Northern Neuquen occurs at locality ornamentation Outer view outline penultimate volution Pictet et Campiche Picun Leufu Plate Plesiotype posterior end posterior margin posteriorly Quintuco formation right valve sandstone shales shell slightly concave slightly convex South Central Neuquen Sowerby species occurs specimens Steinmann Supplementary Description surface Syntype thickness Tithonien Trigonia tubercules Type Material ultimate volution umbilical shoulder umbilical slope umbilicus umbonal ridge Vaca Muerta Valanginien venter width