. The origin and evolution of life, on the theory of action, reaction and interaction of energy. ation of the North American continent (white), continental seas (gray),and ocean (dark gray), in Middle Devonian (Hamilton) time. This period ismarked by the last extensive inundation of the Arctic seas, by the rise of the Schick-chockian Mountains and many volcanoes in Acadia, and by the beginning of thegreat Catskill delta built up by rivers from the rising Acadian region. Marine sharkand arthrodires become abundant, the American fauna of the Mississippi Sea showsnumerous brachiopods and bivalves
. The origin and evolution of life, on the theory of action, reaction and interaction of energy. ation of the North American continent (white), continental seas (gray),and ocean (dark gray), in Middle Devonian (Hamilton) time. This period ismarked by the last extensive inundation of the Arctic seas, by the rise of the Schick-chockian Mountains and many volcanoes in Acadia, and by the beginning of thegreat Catskill delta built up by rivers from the rising Acadian region. Marine sharkand arthrodires become abundant, the American fauna of the Mississippi Sea showsnumerous brachiopods and bivalves, and the first evidence of a land flora with largeconifers (Dadoxylon) is found. Detail from a globe model in the American Museumby Chester A. Reeds and George Robertson, after Schuchert. Reactions to Climatic and Other EnvironmentalChanges of Geologic Time Schuchert observes that there is no more significant periodin the history of the world than the Devonian^ (Fig. 32), forat this time the increasing verdure of the land invited the ^Pirsson, Louis V., and Schuchert, Charles, 1915, p. 714-. Q a .u o. ti o g m c o D, PS a. 0) -a w ^ >H Fi is t- ;i s =^ v5 y ^ •j^ C j3 & i: P ^^ o X u ■^ £ o^ 13 -2 2 5 bp T-! ^ ^ •- .ti >. Ji ._ C^ IrH S ^ u .2 O .S rt ti j^ ■21 ti £ ilo o c ^•- w0 cJ ^ £ £■ju ?; ^ - rr C ® g .2 .2 C^-xS S rt -2 C CI, t^ p C C O n oj ^ ^ ^ 5 cT •J rt 2 ■« D O K rt o ^ 2 ^ 135 136 THE ORIGIN AND EVOLUTION OF LIFE invasion of life from the waters, the first conquest of the terres-trial environment being attained by the scorpions, shell-fish,worms, and insects. This is an instance of the constant dispersion of animalforms into new environments in search of their food-supply, the chief instinctivecause of all impulse is con-stantly acting and react-ing throughout geologictime with the migrationof the environment,which is graphically pre-sented by Huntingtonschart (Fig. ;2^;^), from theresearches of Barrell,Schuchert,
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