WHITHER READVANCES IN THE HUDSON AND MOHAWK LOWLANDS OF NYS?

A complex stack of glacial advance and retreat sediments occupy the eastern Mohawk Lowlands, but the sediments in the mid-Hudson Lowlands between Saratoga and Kingston record only one glacial advance and retreat sequence. Evidence for a minimum of two westward glacial advances is present in the Mohawk Lowlands. They deposited the Hell Hollow and Mohawk tills. The Hell Hollow Till is overlain by the Little Falls Gravel, which is interpreted as having been deposited by east-flowing streams during the Erie Interstade. The Little Falls Gravel has not been mapped into the Hudson Lowlands. The Mohawk Till overlies the Little Falls Gravel. The Mohawk Till was deposited by the Middleburgh Readvance, which overspread the Mohawk Lowlands and Helderberg Plateau. The Middleburgh Readvance correlates with the Rosendale Readvance in the Wall Kill Lowlands. The base of the glacial sequence in the Hudson Lowlands consists of Mohawk Till, which was deposited approximately 13,500 radiocarbon years ago. The till is overlain by fining-upward ice-contact lake deposits overlain by lake and dune sand, dating from 12,600 to 11,900 radiocarbon years ago.