. The origin and evolution of life, on the theory of action, reaction and interaction of energy. ANCHISAURUS Fig. 94. Analogy Between the Carnivo-rous Anchisaunis Type of the TriassicAND the Ancestral Herbivorous Sauro-POD Type Platcosaiirus. The upper restoration (Plalcosaurus) repre-sents a bipedal stage of sauropod evolutionwhich was discovered in the German Trias,in which the transition from carnivorous toherbivorous habits is observed. Recentdiscovery renders it probable that theherbivorous Sauropoda descend from carniv-orous ancestors like Anchisaunis. Restoration of Plaleosaurus modifie
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. ANCHISAURUS Fig. 94. Analogy Between the Carnivo-rous Anchisaunis Type of the TriassicAND the Ancestral Herbivorous Sauro-POD Type Platcosaiirus. The upper restoration (Plalcosaurus) repre-sents a bipedal stage of sauropod evolutionwhich was discovered in the German Trias,in which the transition from carnivorous toherbivorous habits is observed. Recentdiscovery renders it probable that theherbivorous Sauropoda descend from carniv-orous ancestors like Anchisaunis. Restoration of Plaleosaurus modified from Jae-kel. Restoration of Anchisaurus after Lull. HERBIVOROUS DINOSAURS 217 quadrupedal mode of progression is revealed in the recentlydescribed Plateosaiirus of Jaekel from the Trias of Germany(Fig. 94), an animal which could progress either on two or onfour legs. The Sauropoda reached the climax of their evolution dur-ing the close of Jurassic (Morrison formation) and the be-. PALEOOEOGRftPHY. LOWER CRETACEOUS (UPPER NEOCOMIAN-VELANGIAN-HILS-WEALDENAFTER SCHUCHERT. APRIL 1918»..^ MARINE DEPOSITS T; CONTINENTAL DEPOSITS \ SIERRA NEVADA ITY-MORISSON) 1 Fig. 95. Theoretic World Environment in Lower Cretaceous Time. The dominant period of the great sauropod dinosaurs. This shows the theoretic SouthAtlantic continent Gondwana connecting South America and Africa, and the EurasiaticMediterranean sea Tclhys. Shortly afterward comes the rise of the modern floweringplants and the hardwood forests. The shaded patch over the existing region of Wyo-ming and Colorado is the flood-plain (Morrison) centre of the giant Sauropoda (see ). After Schuchert, 1916. ginning of Cretaceous time (Comanchean Epoch). Meanwhilethey attained world-wide distribution, migrating throughout along stretch of the present Rocky Mountain region of NorthAmerica, into southern Argentina, into the Upper Jurassic ofGreat Britain, France, and Germany, and into eastern last named reg
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