Show ROCKS RECORD THE AGES Carboniferous Show Shon Mark of ot Animal Life Lite Scientists hesitate to estimate geologic geo logic time In terms of or years Such I estimates have however been made madeJ I and one ono published b by Prof Charles S In 1910 1010 states that about I years have havo elapsed since tho the close of or the carboniferous age an nn age I a ay al th the th name suggests ts in which great deposits of or carbon in coal W l' l being formed in many parts of ot the world This ago age has b divided by geologists into the Mississippi Pennsylvanian Pennsylvania and Permian epochs of ot which the I Mississippi Is the oldest and the tho Per Per- mian th the youngest est Tho The Pennsylvanian Pennsylvania I epoch alone is estimated by to have co covered cored red years and I animal life Is supposed to have exIsted existed ex ex- ex- ex isted on the earth for tor or over o years ears before that time Geologic periods are arc recognized primarily manly marily b by the animals and plants that lived in them so that tho tim stud study of or oro fossils o plays a II very ery real and Important I j part art In tho the progress of or geologic Ic know know- ledge o of or carboniferous age know I as j shown b by their fossils have a wide distribution In the thc United States and and they are arc apt ant to abound In these re remains remains re- re mains of or plant and animal life The re-I re fossils shells which are arc found In thorn them however nH nu vary greatly from point to point because tue the animals thc they represent lived in different periods of 1 geologic time limo or In different nt regions regions' in the carboniferous ocean In this I r I connection a recent publication o 0 states geological survey sur B tin des describes tho the fauna tauna o of I Wewoka formation of or Oklahoma a a. consisting consisting- of ot a group of or r t ri i f Pennsylvania ago in a region w the geology Is not as wall well know In tho upper Mississippi and Ohio Jeys leys es e's The hc report de describes 10 1 dl di lent ent fossils onie me of which are arc ne no nescience science while others OthOl'S havo a I well nigh a as wide as the continent a L range as long JonS' as all nil a time A copy of or Bulletin riB ma mai i I had on application to the dire United States ta tes geological al survey W V Ington Inston D. D C. C A J |