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Analysis of pit craters on the eastern wall of Hale Crater

Introduction: Hale crater located at 35.7°S  36.34°W in the north region of Argyre basin it’s a  complex impact crater with a central peak and a  slightly elliptical rim (140 in the short axis and 160 km  in the long axis). Hale is one of the largest impact  craters that has associated channels with a radial  pattern [1]. Several works have identified and  described geoforms associated with glacial and  periglacial environments, such as lateral moraines,  rock glaciers, polygonized surface [2][3][4]. In  addition, the presence of gullies on the walls of the  crater indicates recent water activity that some authors  associated with ice melting and groundwater [5]. Here we report depressions and glacial and  periglacial geoforms found in the external east-facing  slope of the crater rim. In particular, circular to  subcircular depressions are recognized whose  characteristics are compatible with those of pit craters  [6]. In this work we identify and map this region of  the Hale crater and propose possible formation  mechanisms. Methods​: We focused the analysis on the east  crater wall, mapping this region using HiRISE and  CTX images (Figure 1). We identify and describe the  depressions emphasizing the morphological  distribution, size, orientation and relationship with  other recognized geoforms.