The fossil weighs 10 kilogrammes and is one foot long. It is believed to be 3.3 million years old, Express News reported.
It was found by Punjab University's research scholar Ghayyur Abbas and field guides Chaudhry Abid Hussain and Mehtab Khan. The fossil will be examined at the Punjab University.
Scientists confirm 3.5 billion year-old fossil life in rock
Sohawa is a hotbed for fossils, with many other discoveries made there in recent years.
The plant-eating, semi-aquatic mammals called anthracotheres flourished over 40 million years and died out less than 2.5 million years ago. They are believed to have left only one descendant - the hippopotamus.
Earlier, the skulls of a nine million-year-old anthracothere, Merycopotamus medioximus, and a contemporaneous fossil hippopotamus (Hexaprotodon sivalensis) were found in Pakistan's Siwalik Hills, according to Berkeley.
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