"The physical properties and gross compositions of several shale oils produced by retorting Colorado's Green River Formation oil shale are compared using data obtained by a standardized distillation analysis method . Although specialized retorting techniques can be used to vary the oil properties the usual shale oil is a viscous, high-pour-point oil containing large quantities of nitrogen, sulfur, and oxygen-containing compounds. it consists of small quantities of naphtha, larger quantities of distillate fuel, and often 50 percent distillation residuum . Detailed compositions of several naphtha's have been published . The information is summarized for this report. Results of research, currently under way, into the composition of the distillates boiling above 200 C is also summarized indicating gaps that require further work to fully characterize the fractions."