Minimum age of the Mapleton, Tully, and Labrador Hollow moraines indicates correlation with the Port Huron Phase in central New York State

Abstract

The glaciated terrain along the northern edge of the Appalachian Plateau in the eastern Finger Lakes of central New York has long been recognized as an important location for meltwater routing and for proglacial lake development in the Great Lakes region. Despite recognition of multiple ice margins formed by the Ontario Lobe of the Laurentide ice sheet during the late Wisconsinan, numerical age control of several margins has been elusive, particularly in regard to regional readvances of the Port Bruce (ca. 16,980–18,000 cal [calibrated] yr B.P.) and Port Huron (ca. 14,300– 16,000 cal yr B.P.) Phases. Utilizing light detection and ranging (LiDAR) terrain models in the eastern Finger Lakes area, we identified and described the Mapleton, Tully, and Labrador Hollow moraines. Associated ice-marginal landforms include push moraines, fans, and hummocky topography. In places, these features intrude into the northern heads of through valleys. Coring of three basins directly associated with these landforms yielded more than 20 samples of boreal tree needles and twigs, and Dryas leaves. Accelerated mass spectrometry (AMS) radiocarbon assay results indicate that poststadial lacustrine sedimentation began at ca. 15,000 cal yr B.P., consistent with ages of the Port Huron Phase.

Subglacial and ice‐marginal landforms in south‐central Ontario: implications for ice‐sheet reconfiguration during deglaciation

“…7D, E). Bedforms with consistent orientations to those described here are also observed on the surface of the HT (and regional equivalents) and are associated with a series of subtle till-cored moraine ridges to the west (Karrow 2005;Eyles et al 2011;Burt & Mulligan 2017) and south of Lake Ontario (Kozlowski et al 2018).…”

“…The morphological characteristics and patterns of bedforms within the PDF point to a time-transgressive development of bedforms within the field, consistent with many areas along the periphery of the LIS (Colgan & Mickelson 1997;Sookhan et al 2016;Kozlowski et al 2018). An early, regional drumlinization phase occurred under thick ice flowing towards the SW (Figs 8-10).…”

“…; Kozlowski et al . ). An early, regional drumlinization phase occurred under thick ice flowing towards the SW (Figs 8–10).…”

“…The change of ice-flow directions between deposition of the NTand the HT is probably due to break-up of regionally southwest-flowing ice into smaller, independent ice lobes/ streams around the axis of the ORM (Barnett 1992a;Sookhan et al 2018a, b), which is underlain by a high on the subglacial bed (Howard et al 1995;Sharpe et al 2005;Kassenaar & Wexler 2006). Radial expansion of thicker ice along the axis of the Lake Ontario basin could be expected, producing the bedforms in the LODF consistently orientated perpendicular to the modern Lake Ontario shoreline (Eyles et al 2011;Slomka 2014;Eyles & Doughty 2016;Burt & Mulligan 2017;Kozlowski et al 2018; 2018a, b). Ice flowing along the deep Lake Ontario basin, characterized by fine-grained substrate sediments and a large ice-marginal lake, would have generated high pore-water pressures and low effective stress at the ice-bed interface (IBI), facilitating fast (streaming?)…”

Evidence for a late glacial advance near the beginning of the Younger Dryas in western New York State: An event postdating the record for local Laurentide ice sheet recession

“…In contrast, there is limited control for the Late Wisconsin glacial chronology of east-central New York (Ridge, 2003(Ridge, , 2004(Ridge, , 2018Ridge et al, 2012) as well as for Middle Wisconsin events in the central Finger Lakes and the Genesee Valley (Young and Burr, 2006;Karig and Miller, 2013). Kozlowski et al (2018) make a case for locating the Port Huron Phase maximum at 14,300-16,000 cal yr B.P. north of the eastern Finger Lakes.…”