Fracturing of oil shale was coeval with albertite vein formation at Albert Mines early in the diagenetic history of the Lower Carboniferous (Tournasian) Albert Formation. Albertite of this type locality is a pre-oil bitumenn produced as a result of overpressuring due to a high rate of hydrocarbon generation and, as such, is largely preserved in an immature source rock. Dolomite precipitated in albertite during emplacement of the latter, and was sourced from an accompanying CO2-rich fluid phase. Trace element contents of albertite are within the range of selected other major bitumen occurrences and except for nickel, are lower than those of the host rock Ratios of Ni/V are elevated in comparison with the host oil shale and with other bitumen occurrences, Carbon isotope values for albertite range from 27.92 to 30.80 parts per thousand, delta C-13, within the range of most conventional crudes.