“…The grain diameter is shown in φ scale as φ=−log 2 d, where d represents the diameter. The definition of the sorting is from Rominger (1954): very well sorted (0b σφ b 1), well sorted (1b σφb 2), normally sorted (2 b σφ b 3), poorly sorted (3b σφb 4), and very poorly sorted (4 b σφ). Grain size distributions in the SWRC (loc.…”