The Hudosn River? It flows over rock that has been around since the Middle Proterozoic Time Period. That is more then 542 million years ago!!!!
hudson river
Syracuse
Devonian.
Cod
Limestones, shales, sandstones, and conglomerates
Adirondack Mountains and Hudson Highlands
Devonian
According to the website of the New York State Geological Survey (see related link), the majority of sedimentary bedrock in New York State was deposited in a 160 million year period in the early to middle Paleozoic era from approx. 520 to 360 million years ago.
The western shore of lake champlain.
Ithaca?shale
The Adirondack Mountains, Taconic Mountains, and the Hudson Highlands have the most resistant bedrock.
in the tug hill plateau
Tug Hill Plateau and St. Lawrence Lowlands