Revisiting the deformed high shoreline of Lake Bonneville

TitleRevisiting the deformed high shoreline of Lake Bonneville
Publication TypeJournal Article
Year of Publication2017
AuthorsChen C.Y, Maloof A.C
JournalQuaternary Science Reviews
Pagination169 - 189
Date Published03/2017
ISBN Number0277-3791
Other Numbers51Maloof
KeywordsGreat Basin, Isostasy, Lake Bonneville, Paleoclimatology, Paleoshorelines, Shorelines, Still water level

Since G. K. Gilbert's foundational work in the eastern Great Basin during the late 1800s, the late Pleistocene Lake Bonneville (30–10 ka) has been recognized as a natural laboratory for various Quaternary studies, including lithospheric deformation due to surface loading and climate-forced water balance changes. Such studies rely on knowledge of the elevations of Lake Bonneville's paleoshoreline features and depositional landforms, which record a complex history of lake level variations induced by deglacial climate change. In this paper, we present (1) a new compilation of 178 elevation measurements of shoreline features marking Lake Bonneville's greatest areal extent measured using high-precision differential GPS (dGPS), and (2) a reconstructed outline of the highest shoreline based on dGPS measurements, submeter-resolution aerial imagery, topographic digital elevation models (DEMs), and field observations. We also (3) devise a simplified classification scheme and method for standardizing shoreline elevation measurement for different shoreline morphologies that includes constraints on the position of the still water level (SWL) relative to each feature type. The deformation pattern described by these shoreline features can help resolve the relative effects of local hydro-isostasy due to the lake load and regional solid earth deflection due to the Laurentide ice sheet, with potential implications for Earth rheology, glacial isostatic adjustment, and eustatic sea level change.


Short TitleQuaternary Science Reviews