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Cross Mountain is the highest peak in the Bear Pond Mountains, a sub range of the Appalachian Mountains. This grouping of mountains straddle the Maryland and Pennsylvania border. Cross Mountain and Hearthstone Mountain which is on the Maryland side, form a unique geologic formation known as the "Punchbowl". This feature was created by the weathered shales of the Ordovician age in the center of a south-plunging anticline, having been eroded to expose a large amphitheater like feature (punchbowl). Cross and Hearthstone Mountain are made of hard resistant quartzite of the Tuscarora Formation of the Silurian age. Cross Mountain is also the site of a deactivated microwave relay station, that was used during the Cold War. The unit was encased in a 103 ft. tower, and known as the "Cannonball" site 2. The site was closed in 1977. Access to the summit is still restricted. ==References== Alan R. Geyer (1979) "''Outstanding Geologic Features of Pennsylvania''", Geological Survey of Pennsylvania * (【引用サイトリンク】 Latitude and Longitude from TopoQuest ) Albert LaFrance, ''Secret Cold War Landscape'', Presidential Emergency Facilities Microwave Radio Relay Station Site 2 - "Cannonball" atop Cross Mountain, near Shimpstown, PA., Cold War webring, last update June 12, 1999. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cross Mountain (Pennsylvania)」の詳細全文を読む スポンサード リンク
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