In the Dobrudzha Coalfield, mariopterids are found frequently. They are creeping plants associated with flood plain sediments. The changes in architecture and species composition are clearly connected with variations in rain falls and the onset of periods of long, dry conditions. One specimen with seeds attached on the lower surface of a pinna proves that Mariopteris belongs to the pteridosperms. Dicksonites and Fortopteris are rare.
Mariopteris, attached seed, habitat, creeping, climate, Dobrudzha Coalfield