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e <br />ESPEY, HUSTON & ASSOCIATES, INC. <br />U <br />The FF seam is confined to lands along the axis of the Sulfur Creek <br />syncline where otherwise it has been removed by erosion. It is uniformly thickest in <br />the northwest quazter of section 21 where it is merged with the Upper FF seam <br />(UFF), also of similaz thickness and distribution. East of drill hole number NM-71, <br />the interval between the FF and UFF seams increases from 0 to 85 feet and consists <br />of discontinuous cross-bedded sandstones, laminated burrowed siltstone-mudstone <br />and dazk bedded shales. On federal coal lease C-18358, the UFF seam splits into <br />two thin coals each about 3 feet thick and sepazated by about 30 feet. <br />Strike of the FF-seam coal in the south limb of the syncline is about N. <br />83° E with dips of 17 degrees north at the Northern No. 1 (FF-Seam) Mine and <br />decreasing to 0° neaz the synclinal axis. North of the axis, dips of 30° and greater <br />have been measured. Where interrupted by faults, displacement is most commonly <br />less than 10 feet; however, larger offsets do occur locally. A high-angle reverse <br />fault with a maximum displacement of approximately 40 feet was encountered in <br />drill hole M-170. <br />Depth of cover above the seam at the Northern No. 1 (FF-Seam) Mine <br />ranges from 150 feet to a maximum of 583 feet. <br />2.2.5 Paleontology <br />Fossil remains preserved throughout the sedimentazy rocks of the <br />Williams Fork Formation are principally cazbonaceous impressions of paleo-flora <br />consisting of paztial leaves, twigs and roots or branches. Trace fossils aze <br />represented by burrows and trails and aze evident both in portions of strata cores <br />and at numerous outcrops along strata bedding planes. <br />Locally, beds of disazticulated oyster shells (Crossostrea sp. and <br />Inoceramus sp.) aze present at numerous stratigraphic horizons between the P-seam <br />coal bed and the Trout Creek Sandstone. Beds of coquina may be 4 to 15 feet thick <br /> <br />F-12 <br />