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GSI installs display boards at Mawmluh cave and Therriaghat

Date: 02 May 2019 Tags: Geography & Environment

Geological Survey of India (GSI) North Eastern Region (NER) has installed two geological display boards at important geological sites Mawmluh cave and Therriaghat, Sobhar in East Khasi Hill District, Meghalaya. The purpose of these boards with geo-scientific information is to create awareness among visiting tourists and general public.

Mawmluh cave

The stalagmite in Mawmluh cave has been tagged Global Stratotype Section and Point (GSSP) for Meghalayan Age. It is the first formally ratified marker of geological time period in India. The high resolution stable isotopic studies of stalagmites from this cave have shown that there was major climatic event about 4200 years ago.


Um-Sohryngkew (Wahrew) river section at Therriaghat is known for having most complete records of Cretaceous-Palaeogene (K-Pg) boundary transition in India.  It marks Cretaceous (K)-Palaeogene (Pg) mass extinction event. It also has high level of iridium metal from boundary marking catastrophic event when giant meteorite hit the earth.

Most of large vertebrates such as plesiosaurs, dinosaurs, mosasaurs and pterosaurs on earth, most plankton and many tropical invertebrates had suddenly became extinct at end of Cretaceous period. At about the same time, Earth was hit by giant meteorite causing very high values of iridium metal in contemporary rock record.

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