The overthrust in New York, which places Lower Cambrian rocks in contact with Middle Ordovician rocks, is known as Emmons' line, formerly Logan's line after William Edmond Logan. This segment is named after Emmons and extends from Canada through Vermont, New York, and farther south. It traverses through the city of Troy, New York and the Poesten Kill Falls and Gorge. He named the Adirondack Mountains (1838) and Taconic Mountains (1844) and acquainted the public with these regions.