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• TABLE II -D- <br /> z 1 <br /> Coal Related Strata Thickness and Depth <br /> Approximate <br /> Average <br /> Strata Thickness Depth <br /> Rollins 120 ' -140 ' 2 , 450 <br /> Coal Basin Interval 20 ' - 30 ' 22400 <br /> Lower Bowie Shale 370 ' -425 ' 2 , 100 <br /> Middle Sandstone 30 ' -130 ' 2 , 000 <br /> "M" Bed 4 ' - 20 ' 2 , 000 <br /> Upper Bowie 40 ' - 60' <br /> Upper Sandstone 100 , 1 , 800 <br /> Placita 31 - 7 ' 1 , 800 <br />`. • Paonia Shale : <br /> Placita to Sunshine 50 ' - 60 ' 1 , 750 <br /> Upper Paonia Shale Indistinct 1 , 700 <br /> Upper , undifferentiated <br /> Williams Fork Indistinct To surface <br /> 28 <br />