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Parnell Knob : ウィキペディア英語版 | Parnell Knob
Parnell Knob is a mountain in the Ridge and Valley Appalachians region of south central Pennsylvania. This knob rises above the village of St. Thomas, where Front Mountain and Broad mountain come together. It is a feature sculptured by the hard dense Tuscarora quartzite of the Silurian age. Parnell Knob is conspicuous in that it rises abruptly above the relatively level Great Appalachian Valley. ==References== Alan R. Geyer (1979) "''Outstanding Geologic Features of Pennsylvania''", Geological Survey of Pennsylvania * (【引用サイトリンク】 Parnell Knob on USGS topographic map )
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