Properties (Pr). Properties of the ejecta blanket and shape of the crater(s)
indicative of impact angle: (1) asymmetric ejecta blanket (45-60 degrees), (2)
missing ejecta uprange (30-45 deg.), (3) partially missing ejecta downrange
(15-30 deg.), (4) butterfly ejecta pattern (0-15 deg.), (5) steepening of
crater walls uprange (15-30 deg.), (6) elongate crater shape (0-15 deg.), (7)
ricochet fragments (0-15 deg.), and (8) single ricochet crater (0-15 deg.).
Classification based primarily on Gault and Wedekind (1978, Proc. LPSC 9, 3843).