The superiors ranks in the Comanesti Basin are reached because: the geothermic gradients have high values; the tectonics factors have an active role in the basin formation; the reached coaling degree is reflected by the coal petrographic constituents (Table 4) caloric power (Table 3).

The other of coal bearer formations; superior Volhinian at Falticeni (12-13 m.y) and superior Basarabian – Chersonian at Comanesti (10-11 m.y.): the during depth of these formations is not the couse of their different; the generating paleoflora, arborical generally is characteristic to forestial peat bogs in the both case.