A number of models, developed primarily in the 1980s, propose that Aboriginal Australian populations contracted to refugia -well-watered ranges and major riverine systems -in response to climatic instability, most notably around the Last Glacial Maximum (LGM) (~23-18ka). We evaluate these models using a comprehensive continent-wide dataset of archaeological radiocarbon ages and geospatial techniques. Calibrated median radiocarbon ages are allocated to over-lapping time slices, and then K-means cluster analysis and cluster centroid and point dispersal pattern analysis are used to define Minimum Bounding Rectangles (MBR) representing human demographic patterns. Exploring data between 25-12ka, we find a refugia-type hunter-gatherer response during the LGM (~23-18ka) and again during the Antarctic Cold Reversal (ACR) (~14.5-12.5ka), with expansion in the intervening period. Several refugia persist between 25-12ka, including (by Interim Biogeographic