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<br />" <br /> <br />< <br /> <br />.;:; <br /> <br />MlDDtE-ROCKY - HOUNT AIN-PROVINeE- <br />.. <br />.1 ,1\ J ,t!11J'~'A..~'4'''''' <br />,...1.r-,\C.J. I~ H 0 . <br /> <br />Only a small tip of this-p~ovinD€ occurs in the northwestern corner of <br /> <br />the state and is an extension of the rugged east-west oriented Uinta <br /> <br />Mountains. Structurally, the Uinta Mountains are formed by a severely <br /> <br />eroded plateau which is flanked by steeply dipping strata. The center <br /> <br />portion consists of pre-Cambrian quartzites which are flanked by younger <br /> <br />sedimentary beds. The upturned sedimentary beds along the southern <br /> <br />extent are covered by a lower flanking plateau composed of material eroded <br /> <br />from the interior plateau. <br /> <br />Two deeply incised rivers, the Yampa and the Green Rivers, have drainages <br /> <br />that enter or cross the Uinta Mountains in a manner independent of its <br /> <br />structure. <br /> <br />~OMING-BAS1N-PRevINCE- <br /> <br />, , <br />,f ","'~-""'-""'j ..3~"":"'-' <br />~''''J , <br /> <br />Overall t~s province is a large depositional basin encircled by the <br />) .{ <br />S>>1"I{ <br />southern and middle Rocky Mountains ,lith a"portion, the Yampa Basin.r<<lorJ <br /> <br />sf thi&-bdsin occurring in ~ Northwest COlorado, ~t-nortrr-an~ast <br /> <br />oL.the.. Uinta .Mountains. It is primarily an area of erosion features <br /> <br />(scarps and cuestas) developed on mildly folded sedimentary beds. One <br /> <br />rugged cuesta has enough relief to be labeled locally as the William <br /> <br />River Mountains. <br /> <br />0356 <br />