In order to use coal resource terms with precision and common understanding and to compare resource data effectively, the authors developed a standardized, definitive, broadly applicable classification system to derive uniform, coordinated coal resource estimates. The principles of the system for all mineral resources ape given in USGS Circular 831.

Thickness of the Catskill Formation_______ Pre-Pocono unconformity.___________________ Mississippian System__________________________ Pocono Formation __________________________ Beckville Member._____________________ Mount Carbon Member.________________ Thickness of the Pocono Formation.______ TABLE 1. Observed ranges of plant fossils in the Llewellyn Formation and upper part of the Pottsville Formation._____________________________________________________ 2. Production of anthracite from the Anthracite region, Southern Anthracite field, and report area_______________________________________________________________ 3. Average thickness and range in thickness of Llewellyn and Pottsville coal beds_ __..__ 4.

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FIQUEE 1. Index map of uranium-bearing coal and carbonaceous shale in the United States.