Abstract
Impact craters on gypsum targets made by oblique impacts at 4.2 km/sec are compared with those on ice, gypsum (lower impact velocity), and basalt. As shown in Burchell and Mackay (1998) which deals with impact cratering on metal targets, the crater shape-dependence on the impact angle changes with the impact conditions, such as the density ratio between target and projectile, and impact velocity.