CHANGES IN ATTITUDES #2, THE SLOPE OF THE WATER PLANES OF GLACIAL LAKE ALBANY, HUDSON LOWLANDS, NY

We presented a historical overview of post-glacial rebound gradients in the Hudson Lowlands at the 2013 NEGSA. Our review noted that the majority of the workers in the lowlands inferred a gradient of 2.0 to 2.5 ft/mile for ice-contact Lake Albany. This gradient is approximately half the gradient in the Connecticut Lowlands (Kotef, Stones). We revisited the gradient issue by plotting the distribution and elevation of 250 deltas from Newburgh to Troy, NY. We determined a gradient of 2.56 ft/mile for rebounded ice-contact Lake Albany from Beacon to Schenectady, based on kame deltas. The gradient steepens north of Albany to 3.54 ft/mi. There are several concave-up rebound curves, including a curve in the lower Hudson Lowlands that coincides with the margin of the Middleburgh-Rosendale Readvance.