The result shows that vitrinite reflectance was lowered due to exinite existed underneath the measuring surface of thin-layered vitrinite, especially when exinites were close to the vitrinite surface.

• 在透射光下发现当测量面的镜煤素下方有膜煤素存在时，反射率呈现明显下降，且反射率被抑制之情形与膜煤素和镜煤素间的距离相关，即两者间愈近，反射率测值愈低。