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is indistinct . It merges into the upper , undifferentiated <br /> • Williams Fork which. consists of sandstones , siltstones , <br /> mudstones and shales , and which forms the resistant upper <br /> cliffs and ridges which surround the Coal Basin, and the <br /> surface strata of the permit and mine plan areas across the <br /> Huntsman Ridge divide . <br /> West of Huntsman Ridge, down-slope from the <br /> Coal Basin mine plan and permit area (s) , the Tertiary <br /> Wasatch-Ohio Creek conglomerate outcrops in the adjacent <br /> area . It is the youngest consolidated bedrock unit associated <br /> with the Coal Basin area , and consists of up to 5 , 800 ' of <br /> interbedded claystone , siltstone , sandstone and conglomerate <br /> in the Wasatch, and around 400' of sandstones and conglomerates <br /> • in the Ohio Creek. As noted , the Wasatch-Ohio Creek conglomerate <br /> does not overlie the coal deposits to be mined during the <br /> permit and mine life periods and is not found in the mine <br /> plan or permit areas . <br /> Unconsolidated Quaternary alluvial deposits <br /> can be found in adjacent areas on both sides of the divide , <br /> within the East Muddy Creek and Coal Creek drainages . <br /> Quaternary alluvial deposits occur , as well , in landslide <br /> areas on the hillslopes to the west and east of Huntsman <br /> Ridge, where Pleistocene gravel deposits can be found as <br /> well . <br /> d . Topography <br /> The Coal Basin is characterized by steep , <br /> • <br /> 11 ` <br />