This striking waterfall is the result of geologic activity some 18,000 years ago. Immense glaciers covering this region began melting, sending floodwaters down Clarks Run. Eventually, the creek cut deeply through the overlying rock and soil until it . . . — — Map (db m167529) HM
During the term of Thomas Jefferson, the Embargo Act of 1807 was passed ending the importation of iron from England and Europe. Iron furnaces sprang up immediately in western Pennsylvania to supply the needs of the pioneers and cash-in on the high . . . — — Map (db m167530) HM
