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<br /> <br />Pafe <br />• <br />Ctsczinticn of Lzistin~ Erviror.~:ent <br />T}e coal beds disco•+ered on Coal leases C-C125~1: and C-0125516 are <br />contained in the Y w nt Garfield Formation of the :;esaverde Group of <br />l:i par Cretaceous ase. The thick coal sea:.:s lie is t:.e lo:+er portion of <br />the :,wnt Garfield Formation. <br />"Toe lover ;.art of t!•,e ?'a~~t G.:r'ield Fora:iea consists of sandstone, <br />shale, sandy shale, CarbJnoC2CL'9 shale, and coal. Three principal <br />kinds of sar•dntonea ere reported: 1) the thick, cassive, white Rollins <br />=_..,r cne c. x:__=r :_ cripi.. ..c I`.:i.r_- __. JiOi_-. sarestoa_s; 2) <br />aasaive sandcene<_ ..-25 feet [hic.l• of fl„viatile origin, and 3) thin, <br />irreFuiar, locally gnarly sandator.es interbedded with ,ray shalt; t?!ese <br />sands[onzs are ciaracteriz_d by ripple - and ccrrent -marks ar.d <br />Seddir.C surfaces shoo thin fill of nits and carbonaceous =aterial. <br />Shele inter'•~~ded wits :he sandetor.es ra.^.~es :rom thin partings to beds <br />1~-3G feet t'r.icl:. Sods of shale vitt~ lu;:ses of unce~ented or poorly <br />corsolidsted sendstone locall}• react: 1G0 feet thic•r.. Carbonaceous <br />shales are usually associated With the coal beds. Coal occurs in <br />overlapping or interiin~ri;G seatis vhic.`~ constitute a coal Tone'. Ie <br />the vicinity of the subject leaae$, t.`.ree coal zones occur in [:.2 !;wnt <br />Garfield .Foraa:ion: the Carbonara, C s eo, and Palisade. <br />?he Carbonera cell zone is stratigraphieally the hi~t,est zone in the <br />• 3cok Cliffa with sinayle coal bean. Tvo sears are csually present and <br />in sc.e places three. i?:e base of tF.~e ln::er sear_ is about 6,? feet <br />above the base o: t:,e Cameo zone. T•.e Car boners coal zone is Cynically <br />developed in the vicinity of C.arbonera, about 6 miles vest of the <br />auuject leases, and in the Move Canyon tree near the south boundary of <br />the subject leases. Coal beds in the Carhoaera zone reportedly <br />• dim in is F. in eumSer, thic;cness, any a:cCanC from vesC to east across the <br />coal field. <br />1'he Cameo coal zone is ^ocabie for the thic!;ness of its seam end its <br />great ext_nt. Although it is t`,e cost ;,roductive coal zcne in the Boo4: <br />Cliffs Field of Colora;lo, it is worked a[ only the ?ook Cliff and Caneo <br />mines. This is due to the fact .haC the Palisade coal in general is of <br />batter quality and is core accessible, occuriug several t:ur,dred fee: <br />lwev_r doves the steea cliffs. In [he eastern p=rt of the field, the <br />Cameo zone icmediately overlies the massive, white, cliff-forWing <br />F.ollins Sandstone. ~uch of [he Cameo coal ie bony, with. a rapid cl:ar.c•e <br />betveea cleat and bony coal. „ar.dstone dikes or 'saodroc+: spars' are <br />cbsracteriacic of [he Car_eo coal zone." ~*i°_ROC3ndl:G, To: Area Yining <br />Supervisor, aut:!or: David V. Yaires, Geolo_•ist, C?.:9~1, July 14, 1975). <br />gee Figure 1 for ;,eneraalized stratigrapt;ic section of th¢ subiec: <br />ayes. <br />3ased upon lizited t:nac•led3e _`rc~ ttst entries and drill .*.oles, the <br />roof reek consists o`_ ;rev to black shales of varying hardness ar.d <br />• <br />