Explanation:

Rajmahal hills

The plant fossil bearing inter-trappean beds of the Rajmahal Formation have been declared National Geological Monuments of India by the Geological Survey of India (GSI), for their protection, maintenance, promotion and the enhancement of geotourism. The Rajmahal hills contain plant fossils which are 68 to 145 million years old. The fossils here have attracted geologists and palaeobotanists from all over the world. The Birbal Sahni Institute of Palaeobotany in Lucknow has a collection of them. There are fears of these fossils disappearing, as the state government in 2018 gave a mining lease in the area to private companies.