- magnesian slates
- петр.• талков шист
English-Bulgarian polytechnical dictionary . 2013.
English-Bulgarian polytechnical dictionary . 2013.
Geological history of India — The geological history of India started with the geological evolution of rest of the Earth i.e. 4.57 bya (billion years ago). India has a diverse geology. Different regions in India contain rocks of all types belonging to different geologic… … Wikipedia