Thar Desert natural vegetation of this dry area is classed as Northwestern thorn scrub forest occurring in small clumps scattered more or less openly. Density and size of patches increase from west to east following the increase in rainfall. The natural vegetation of the Thar Desert is composed of the following tree, shrub and herb species: The endemic floral species include "Calligonum polygonoides", "Prosopis cineraria", "Acacia nilotica", "Tamarix aphylla", "Cenchrus biflorus". The Thar Desert is the most widely populated desert in the world, with a population density of 83 people per km. In India, the inhabitants comprise Hindus, Muslims, and Sikhs. In
Thar coalfield 230 metres. The roof and the floor rocks are claystone and loose sandstone beds. Thar coalfield The Thar coalfield is located in Thar Desert, Tharparkar District of Sindh province in Pakistan. The deposits—16th-largest coal reserves in the world, were discovered in 1991 by Geological Survey of Pakistan (GSP) and the United States Agency for International Development. Pakistan has emerged as one of the leading countries—seventh in the list of top 20 countries of the world after the discovery of huge lignite coal resources in Sindh. The economic coal deposits of Pakistan are restricted to Paleocene and Eocene rock sequences. It