Complex craters (or “basins”) which exhibit a rim crest and both an interior central peak and internal ring of massifs (peak ring) (Baker et al. 2011a).
A protobasin is a transitional impact structure type between central peak crater and peak-ring basin, exhibiting characteristic features of both. It possesses both a central peak and an interior ring of peaks. Both of these features are generally smaller in diameter and have less topographic relief than either central peaks in complex craters and peak rings in peak-ring basins (Pike 1988).
A relative reduction in central peak...
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