The evolution of the earth and its inhabitants; a series delivered before the Yale chapter of the Sigma xi during the academic year 1916-1917 . er hand, inthe lands bordering the Gulf of Mexico and chiefly in Mexicothere are less than 3 miles of Mesozoic sediments, but herethe limestones make up more than one-half of the totalthickness. The Mesozoic is the Age of Reptiles, and yet the littlemammals and the toothed birds are storing up intelligence andstrength to replace the reptiles when the cycads and conifersshall give way to the higher flowering plants. Then followsthe Cenozoic era, the Age
The evolution of the earth and its inhabitants; a series delivered before the Yale chapter of the Sigma xi during the academic year 1916-1917 . er hand, inthe lands bordering the Gulf of Mexico and chiefly in Mexicothere are less than 3 miles of Mesozoic sediments, but herethe limestones make up more than one-half of the totalthickness. The Mesozoic is the Age of Reptiles, and yet the littlemammals and the toothed birds are storing up intelligence andstrength to replace the reptiles when the cycads and conifersshall give way to the higher flowering plants. Then followsthe Cenozoic era, the Age of Mammals, with a thickness inCalifornia of about 5 miles of coarse sediments, contrastingwith about 4 miles of fresh-water detritals in the RockyMountain area, and in these rocks occurs a most wonderful 66 EVOLUTION OF THE EARTH array of modernized animals. The era closes with a verydecided glacial climate and another marked change in theanimal world, out of which man rises to his present primacyamong organisms. Geologists therefore call the present timethe Psychozoic era or the Age of Reason. POTTSV1LLE AREAS OF COAL FORMATION DASHED. FIG. 10.—The marine inundation in Pennsylvania!! time. Coal. swamps in partially marine areas indicated by broken the Pirsson-Schuchert Text-book of Geology, pub-lished by John Wiley & Sons, Inc. u oz zo UU z w C/3 ft, O w ECOi .2 3 u rt -0 f3 M 5; • es 0 o 2 2 rH Cu Ss C _0 1 -S 1 1 J f ^- ^- 00 -^ r»- 0 3 8 •s O bo • Wl ^^ 0rH H ^H O^ T~^ VO *j °° £ CO T3 *O DO CO •S *o n c rt D 03 ™ (A E SV5 COW W CO JO .s s M •* 3 _, O X E U-l 1C 1 1 1 CT .S C . K « g *- S rH ^ rHrH •*-> g ° !I vn CM Q\ oo ^O O 3 S ^ rH rH rH ^~ o O1 tV> rH H 4_J g * •§- CO > — *o n 1 I S 2 1 E 7^ CO CO £ rs ~ CO U £ vn -. E 1 D* ^ C -^- w a •»— t OO r~~ vri f^ hickness and natureof deposits iles coarse detritals i miles muds-sands!i miles limestones \ ^— ^— V CO «» 13 •O to ±j • •C U C w ll^lll i 1 s 1
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