. The origin and evolution of life, on the theory of action, reaction and interaction of energy. c 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 C
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. c 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 region is the one most recently explored, and 2l8 THE ORIGIN AND EVOLUTION OF LIFE the widely heralded Giganiosaurus (= Brachiosaurus), de-scribed as the largest land-Hving vertebrate ever found, is. Fig. gO. -\uKTii i.\ Lrktaceous (Comanchian) Time. This period, also known as the Trinity-Morrison time, is marked by the maximum develop-ment of the giant herbivorous dinosaurs, the Sauropoda. The Sierra Nevada and coastranges are elevated, also the mountain ranges of the Great Basin which give rise east-ward to the flood-plain deposits (Morrison) in which the remains of the Sauropoda areentombed. This epoch is prior to the birth of the Rocky IMountains, which arose be-tween Cretaceous and Eocene time. Detail from the globe model in the AmericanMuseum by Chester A. Reeds and George Robertson, after Schuchert. structurally closely related to and does not exceed in size thesauropods discovered in the Black Hills of South size is indeed titanic, the length being loo feet, while the HERBIVOROUS DINOSAURS 219 longest whales do not exceed 90 feet. In height these sau
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