In support of research studies of in-situ fracturing of oil shale at Los Alamos Scientific Laboratory and Sandia Laboratories, Albuquerque, Stanford Research Institute (SRI) has completed the first phase of a program to develop a quantitative model of the dynamic fracture and fragmentation of this rock. The SRI work during 1976 has included: Dynamic fracture experiments using plate-impact techniques.; Microstructural examination of 20 gal/ton oil shale cores.; Development of a preliminary computational fracture/fragmentation model based on these results.; Lagrangian analysis of stress-gage profiles supplied by LASL to obtain dynamic constitutive relations for 20 gal/ton oil shale.; Small-scale explosive fracturing experiments on oil shale cylinders.