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Ohio Creek Conglomerate and underlain by the Upper Cretaceous Manco Shale. <br /> <br />Locally, the Mesaverde Formation is about 2,500 feet thick and was divided <br />into four members in ascending order: <br />(1) The Rollins Sandstone MemLer <br />(2) Tf,~ Lr,wer Coal Member (Bowie Member) <br />(3) The Upper Coal Member (Paonia Member) <br />(4) The Barren Member <br />Tile Rcllins Sandstone Member is a conspicuous cliff-forming white to <br />• <br />buff sandstone, 150 to 200 feet thick. Jt foams the transition from the <br />open marine "^.ancos shale Formation to the mixed marine/continental roal- <br />b~zaring part of the Mesaverde Formation, °orings, especially Uphiomorpha, <br />are c~~muen in the upper part. This is a regressive sand b~corning generally <br />more massive and coarser-grained in the upper portions of tl:e ~crmaticn. <br />In the •dicinity oc the I~awk`s Fast Mine, the f.owie or t.r_:,rer Coal <br />Member consists of approximately 270 t?et of marim= to lower delta plain <br />sedi~rents. Four correlated coals ~Sre present in the Bottom 100 feet on <br />this member, three of which are mineable. Ir! ascendin; order: <br />(1) A Seam - This is a thin coal of vriabi2 ~hickress (tf~ree inches <br />to several feet) near the F;aw's ?ios.t west Por':al. It. generally <br />marks the top of the Rollins Sai;dstcrle ~1~m~r. <br />(2) Lower B Seam - A mineable attrital ro~i with a. rharacteri.stic <br />thickness of six to ;even feat <br />shale splits. <br />• <br />It SOLTii2t 11Ge5 Ca:i 1•iFi thl n, LOdly <br />2.04-13 <br />