Iron ores, salt and sandstones . n cut. leav-ing second and even third growth. GEOLOGY AND STRUCTURE. The rocks of the Pendleton county area belong in thePaleozoic epoch. The kinds represented are shales, lime-stones and sandstones. At the western side of the county,the lower members of the Coal Measures are exposed, withthe underlying Lower Carboniferous series, including thePocono sandstone, Greenbrier limestone and Mauch Chunkshales. The folds of the North Fork mountain expose nearthe crest the Shenandoah limestone and the Martinsburgshales of the Lower Silurian. The North Fork and SouthFor
Iron ores, salt and sandstones . n cut. leav-ing second and even third growth. GEOLOGY AND STRUCTURE. The rocks of the Pendleton county area belong in thePaleozoic epoch. The kinds represented are shales, lime-stones and sandstones. At the western side of the county,the lower members of the Coal Measures are exposed, withthe underlying Lower Carboniferous series, including thePocono sandstone, Greenbrier limestone and Mauch Chunkshales. The folds of the North Fork mountain expose nearthe crest the Shenandoah limestone and the Martinsburgshales of the Lower Silurian. The North Fork and SouthFork mountains show outcrops of the Upper Silurian andthe Oriskany sandstone of the De\7on?an, while the lowerslopes and the river valleys are formed of and in theDevonian shales, which also form the slopes and crest of theShenandoah mountain. The following table from U. S. Geological Survey. Frank-lin folio bv N. H. Darton. shows the order of the formationsand thickness as exposed in this countv: 152 IRON ORES IN PENDLETON WEST VIRGINIA GEOLOGICAL SURVEY. 153 Trenton. The Shenandoah limestone and Martinsburgshales in this county are found only on the top of North Forkmountain, andhere, according to Darton, form the top of abroad arch or anticline which makes up this mountain;though both formations are removed b} erosion from thenorth end of the mountain, and the anticline is there muchsteeper. Darton describes the limestone as dark blue, drabor gray in color, quite pure in composition, with the bedsvarying in thickness from a few inches to several feet. Hestates that the principal outcrop extends from opposite themouth of Seneca nearly to Circleville, a distance of 12 miles,with a maximum width of 2 miles. The limestone in itsupper part is fossiliferous, and contains numerous sink holes,especially on the western slope of the mountain. The Martins-burg shales, according to Darton, are exposed at many placesalong the crest of the North Fork mountain, where erosionhas cut t
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