Show desert oases the desert contained oases cases that sup tup supported ported ported a animal n imal life and it was in these ese times that the fish which had bad crawled out of the water tome some 80 years previous now began to really enjoy life on land they changed from amphibians to primitive reptiles the forerunners of the great dinosaurs it long geologically speak tag tog that is a matter ot of another years that the mountains to the west eroded down to a plain and the country again became moist and tropical old tuners who brag about how they were around when them mountains was a bole in the gi ground lound little realize that once it was no joke oke working with little chisels of water and wind nature eventually gets the lob job done all AR it needs to is time geologists ats guess that the mountains in the plateau country should be simple hills in around OW more years latest guess on the age of the earth is jis 4 to 5 billion ye years and uranium is one of the engs elements e ants used to date it uranium disintegrates t to lead at a definite uniform rate scientists measure amount mount of the lead in a rock and then have its age around BC tropical conditions came back to the colorado plateau during the jurassic times the warm wet met west winds came again and the plateau entered the most fascinating period of its history A vast amazon like jungle thick with ferns bamboo and gigantic pineapples bid lakes swamps and lagoons fed by sluggish rivers palm trees waved at the tropical moon as the worlds greatest array of goofy beasts ate all the scenery in the neighborhood dumb as they were the dinosaurs some 70 feet in length one s species cies 50 5 0 feet tall conquered the land the sea and the air over the plateau region as they did over the rest of i the world these terrible lizard lizards diversified in about every direction possible |