http://geomaps.wr.usgs.gov/parks/province/appalach.html the Appalachian mountains Appalachian Highlands Province - USGS Geology in the Parks continental collision continental collision continental collision http://geomaps.wr.usgs.gov/parks/province/appalach.html http://geomaps.wr.usgs.gov/parks/province/appalach.html http://geomaps.wr.usgs.gov/parks/province/appalach.html http://geomaps.wr.usgs.gov/parks/province/appalach.html оригіналу Appalachian highlands approximately 300 million years ago Appalachian mountains continental collision http://geomaps.wr.usgs.gov/parks/province/appalach.html http://geomaps.wr.usgs.gov/parks/province/appalach.html оригіналу Appalachian Highlands Appalachians