In the last Ice Age—10,000 to 110,000 years ago—what is now the Monongahela River flowed north across Pennsylvania into the St. Lawrence watershed. At some point, an ice dam gave rise to Lake Monongahela, which was 200 miles long, 100 miles wide and hundreds of feet deep. Now, a series of locks and dams largely …
Howard, Bairnsfather, Hand, Li, Riley, Fullerton Read More »
Bron, Gaffney, Conniff, Waldman, Ebbert, Ellis, Robertshaw, Miller, Walsh, Blum Read More »