Allegany County . ian Hampshire, Jennings,Eomney,Oriskany,Helderberg. Silurian Salina, ,Tuscarora,Juniata. The SiLrRiAX. THE jrXIATA FOEMATIOX. The Juniata formation, known farther north as the Lower or RedMedina or Levant Red Sandstone, (IV b) receives its name -from theJuniata river, Pennsylvania, along which it is typically includes the oldest rocks that appear at the surface in Alleganycounty and outcrops in only one locality. This outcrop is in thegorge just northwest of Cumberland where Wills Creek cuts throughWills Mountain. The formation is made up of dull r
Allegany County . ian Hampshire, Jennings,Eomney,Oriskany,Helderberg. Silurian Salina, ,Tuscarora,Juniata. The SiLrRiAX. THE jrXIATA FOEMATIOX. The Juniata formation, known farther north as the Lower or RedMedina or Levant Red Sandstone, (IV b) receives its name -from theJuniata river, Pennsylvania, along which it is typically includes the oldest rocks that appear at the surface in Alleganycounty and outcrops in only one locality. This outcrop is in thegorge just northwest of Cumberland where Wills Creek cuts throughWills Mountain. The formation is made up of dull red sandstones and shales inter-bedded without any regtilarity of succession. The sandstones arehard, fine-grained, quartzitic near the top, cross-bedded and mica-ceous. Some of the beds exjDosed are more than one foot in thick-ness, but most of them are less than six inches. A few of the bedscontain small rounded or flattened pellets of brittle yellowish-green MARYLAND GEOLOGICAL SURVEY. ALLEGANY COUNTY, PLATE MARYLAND GEOLOGICAL SfRVEY 0( or reddish clay, the largest of which are usually less than one-halfinch in diameter. The shale beds vary from less than one inch to six feet or more inthickness. In general, they are considerably thicker than the sand-stones, and the total thickness of shale in the exposure is much greaterthan the total tliickness of sandstone. The shales, like the sandstones,are almost always distinctly micaceous and weather readily. The depth to which Wills Creek has cut into the formation is 530feet. However, 140 feet of this, computed according to the hori-zontal distance and supposed average dip, is concealed by the heavytalus derived from the overlying Tuscarora quartzite. Along theBaltimore and Ohio Kailroad on the north side of Wills Creek theupper 370 feet is well shown, there being in all of this not more thantwenty feet hidden. Here all of the remainder of the Juniata isconcealed, but 140 feet below, on the opposite side of the creek, alongth
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