The first half of last week, Sunday through Wednesday was taken up at the Geological Society of America meeting in Seattle. Hundreds of talks and presentations to choose from over a three day period. Deciding on which talks to attend was at times difficult.
One of the early talks I went to was titled Sedimentary Processes at Ice Sheet Grounding-Zone Wedges: Examples From Antarctica and Washington State (U.S.A) (Demet and others, 2017). This talk had some practical applications to my own work on landslides.The talk was a brief version of Demet (2016) thesis work on some of the shoreline bluffs of Whidbey Island.
When the Puget ice lobe retreated the sea invaded Puget Sound and for a time the glacial front consisted of a front of grounded ice (ice in contact with the ground) and a sheet of floating ice. Demet and others (2017) recognized several locations where the grounding line may have been present on Whidbey Island as the ice retreat paused and suggests that the grounding line area became an area where there were some minor readvances of the ice sheet.
The pattern of units appears to be consistent with the observations made by Demet and others (2017). Perhaps a more diligent comparison would be in order.