Methodology:

Compilations of new and published age data constraining glacier advance, retreat and aquatic moss layers in lakes from the South Shetland Islands. New and published chronostratigraphic data constraining Holocene glacier readvances from the Fildes Peninsula (n=43), Potter Peninsula (n=29), and KGI (n=76) were compiled and a non-parametric phase model (i.e., a probabilistic version of the Oxcal SUM command) was applied to each dataset using the Bchron v. 4.7.6 in R (Haslett and Parnell, 2008; Parnell, 2021).The Rcarbon package v. 1.4.2 (Bevan, 2021) was used for data analysis.  Additional statistical analysis was undertaken, using R v. 4.1.0/RStudio v. 1.4.1717 (primarily packages Tidyverse, ggplot2, Vegan, Rioja, Ggally v. 2.1.2, RBacon, Rcarbon, Bchron), Sigmaplot v. 14.0, C2 (Juggins, 2007) and MATLAB v. R2021a. Code, data, all packages used, and package references, can be found at: https://github.com/stever60/Fildes_Peninsula and https://github.com/stever60/Potter_Peninsula The data were used in data analysis in the following manuscripts to constrain deglaciation and glacier dynamics on Potter Peninsula and Fildes Peninsula, King George Island South Shetland Islands: Heredia Barion P, Roberts SJ, Spiegel C, Binnie SA, Wacker L, Davies J, et al. (submitted - a) Mid-late Holocene deglaciation and glacier readvances on the Fildes Peninsula, King George Island, NW Antarctic Peninsula. The Holocene. Heredia Barion P, Strelin JA, Roberts SJ, Spiegel C, Wacker L, Niedermann S, et al. (submitted - b). Holocene glacial dynamics and geomorphology of Potter Peninsula, King George Island (NW Antarctic Peninsula). Frontiers in Earth Science.   Density phases produced by similar analysis of published SSI-wide data were less well-defined, likely reflecting local glacier influences and larger errors for some data, and not considered further.