An gano MOR 693 a kusa da Shell, Wyoming, ta hanyar haɗin gwiwar Gidan Tarihi na Rockies da Jami'ar Wyoming Geological Museum. Wannan kwarangwal ne aka gano ta ƙungiyar Switzerland, wanda Kirby Siber ya jagoranta. A cikin 1996 wannan ƙungiyar ta gano wani Allosaurus na biyu, "Big Al Two", wanda shine mafi kyawun kwarangwal na irin sa har zuwa yau. Cikakken, kiyayewa, da mahimmancin ilimin kimiyya na wannan kwarangwal ya ba "Big Al" sunansa; raunin mutum da kansa ya kasance ƙasa da matsakaicin girman Allosaurus fragilis, kuma an kiyasta shi ne kawai 8%. An bayyana samfurin a cikin 1996 ta Brewster.
Shekara ta 1991