Gully formation in the McMurdo Dry Valleys, Antarctica: multiple sources of water, temporal sequence and relative importance in gully erosion and deposition processes

Close-up of punctuated activity in Gully A during December 2010, showing <i>c</i>. 10 cm of fan emplacement and several metres of lateral erosion of pre-existing fan material. Vantage point shown in Figure 4c (Site 3).