Show link feet feet teet corduroy road late glacial age found sit sit hit ohio professor frederick wright oberlin ohio found series lying tilde tilde bide hide hide tilde corduroy road extend length et thirty feet gravel tooth tusk mammoth tusk being ten feet long twenty circumference bate bate base lint lint hut declare artificial road appearance Tance de during log glacial period water ike held level ISO ISO feet IOK IOK log deposit feet above lake level tour tour four miles lake share share shore banks conneaut Conne creek gravel brought down down flown land south source creek nd base daunt |