- The Geological Survey of India (GSI) North Eastern Region (NER) on April 29, 2019 installed two geological display boards at two important geological sites in Meghalaya, with geo-scientific information which will help in creating awareness among visiting tourists, students and the general public.
- The boards are unvieled at Mawmluh cave and Therriaghat, Sobhar in East Khasi Hill District. Mawmluh cave made headlines earlier as high resolution stable isotopic studies of the stalagmites from the cave have shown that there was a major climatic event about 4200 years ago.
- The stalagmite in the Mawmluh cave has been tagged a Global Stratotype Section and Point (GSSP) which is the first formally ratified marker of a geological time period in India. Meanwhile, Therriaghat marks the Cretaceous (K)-Palaeogene (Pg) mass extinction event.
- The Um-Sohryngkew (Wahrew) river section at Therriaghat is known for having the most complete records of the Cretaceous-Palaeogene (K-Pg) boundary transition in India.
