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Figure 8. Dodge and Posey (1981) cross section 1 in the Houston Embayment. The approximate onset of oil generation at 0.6% Ro corresponds to the present-day down-hole temperature of 200°F (93°C) using the general relationship of vitrinite reflectance to temperature established by Barker and Pawlewicz (1986) from worldwide basins. Faults are generalized and represent zones constituted by multiple individual faults.