Thar Desert are good as fencing material. Its roots also encourage "nitrogen" fixation, which produces higher crop yields. "Tecomella undulata" is one more tree species, locally known as Rohida, which is found in Thar Desert regions of northwest and western India. It is another important medium-sized tree of great use in Agroforestry, that produces quality timber and is the main source of timber amongst the indigenous tree species of desert regions. The trade name of the tree species is Desert teak or Marwar teak. "Tecomella undulata" is mainly used as a source of timber. Its wood is strong, tough and durable. It
Thar coalfield metres and rests upon a structural platform in the eastern part of the desert. The generalised stratigraphic sequence in the Thar coalfield area is shown in table. It comprises Basement Complex, coal bearing Bara Formation, alluvial deposits and dune sand. The coal beds of variable thickness ranging from 0.20–22.81 metres are developed. The maximum number of coal seams found in some of the drill holes is 20. The cumulative thickness of the coal beds range from 0.2 to 36 metres. Claystone invariably forms the roof and the floor rock of the coal beds. The coal is brownish black, black and