In the Illinois Basin (IB) the coals with the highest rank are not located within the deepest part (depocenter) of the basin, but rather occur to the south near to an intrusion, additionally the analysis of vitrinite ...

Ol Doinyo Lengai (ODL), Tanzania, is the only active carbonatite volcano on earth. Cyclical activity that consists of quiescent natrocarbonatite lava flow, explosive silicate eruption and dormancy has been observed throughout ...