Fig. 5

Inertinite reflectance histograms showing calculated burning temperature (T = 184.10 + 117.76 × %Ro) of selected reflectance intervals and the possible types. a Sample from the Saihantala and Yimin Formations corresponding to the Albian. All inertinite has low reflectance and low temperature suggesting that it was derived from ground fire; b Sample from the Tengger and Chengzihe Formations of the Aptian. 80% inertinite of low reflectance and low temperature is interpreted to indicate that it was derived from ground fire, while 20% inertinite of high reflectance suggests that it was derived from high temperatures reached in surface fires. n Number of samples