Show oceans met here ai As time went on ur the region be kan an to sink the arctic ocean moved d louth south ax as the gulf of ot mexico flowed north I 1 in n about ON ye bearg a rs they met and formed the vast cretaceous ocean which extended from utah to iowa agich again the rocky mountain chain wai was a bole in the ground the waters were alive with all forms of marine life oysters clams coral ammonites and fuh fish of all torts borts As A this ocean came into the country it laid down a hard vitreous conglomerate each grain of sand each pebble on the beach was pressed and cemented into a rock formation representing a deposit called the dakota thousands upon thousands of 0 stomach stones discarded by the dinosaurs are found in this stratum ilav having I 1 n I 1 only a few chopping teeth the herbivorous dinosaurs dinosaur developed a method of chewing air their food by swallowing stones which were later copied by their distant very distant relatives the modern fowl prospectors can easily distinguish these highly polished from river gravel because they have a peculiar shape all their own with rounded corners and polished depressions wave and ripple marks are common in the d deposits epo sits of this prehistoric ocean beach the cretaceous ocean was around for something like years during which time feet of dime slime and marine skeletons settled on its bottom indicating the ocean was at least a mile deep in this part of the country easily eroded this mancos Manco shale f forms 0 the wide valleys to th the north of the uranium uranium country and has not produced an important deposit of the u stuff yet |