These hills occur at the junction of Northeastern Himalaya and Indo-Burma ranges. The Himalayan arc takes a sharp turn and meets Indo-Burma ranges. The rocks of eastern lesser Himalaya and the central crystallines appear to be largely attenuated and truncated in Mishmi Hills.[2]
Geography
Geomorphically, the Mishmi Hills are divided into 2 sections – the flood plains of tributaries of Brahmaputra river and the Arunachal Himalayas consisting of snow-capped mountains, lower Himalayan ranges, and Shivalik ranges. The Hills reach heights above 5,000 m (16,000 ft) but have not been properly mapped. This hilly area is characterised by steeply sloping landform, sub-tropical evergreen forest and high rainfall. The central part of the Hills wrap around both sides of the Dibang Valley.[3] The Mishmi Hills are part of Shan-Malaysia plate.[4] In 1950, the Hills were the epicenter of a devastating earthquake.
In India, the Mishmi Hills were declared as a district after its bifurcation of Sadiya Frontier Tract in 1948. Again in 1951, the plains area were transferred to the administrative jurisdiction of Assam.[5] In 1952, the headquarters was shifted from Sadiya to Tezu. When the North-East Frontier Agency (NEFA) formed in 1954, Mishmi Hills District became Lohit Frontier Division.
The Mishmi Hills experience heavy rainfall with pre-monsoon showers from March. The humidity and rainfall is about 90%. There are about 6000 plant species, 100 mammal species and about 700 bird species. There are also a large number of butterflies and other insects. Temperate conifers, sub-alpine woody shrubs, alpine meadows, bamboos and grasslands are found in this region. Tiger, common leopard, clouded leopard, snow leopard, golden cat, jungle cat, marbled cat and the leopard cat are found. The endangered red panda is seen in the northern reaches and the hoolock gibbon is in the lower areas. A new subspecies of hoolock gibbon has been described from this area which has been named as Mishmi Hills hoolock H. h. mishmiensis.[6] A new giant flying squirrel named as Mishmi Hills giant flying squirrel has also been described from the region.[7]
^.A. U. Choudhury (2013). Description of a new subspecies of hoolock gibbon Hoolock hoolock from North East India. The Newsletter & Journal of the Rhino Foundation for nat. in NE India 9: 49–59.
^.A. U. Choudhury (2009). One more new species of giant flying squirrel of the genus Petaurista Link, 1795 from Arunachal Pradesh in north-east India. Newsletter & J. Rhino Foundation NE India 8: 27-35, plates".
^.A. U. Choudhury (2010). Mammals and birds of Dihang – Dibang Biosphere Reserve, North-east India. Lambert Academic Publishing, Saarbrücken, Germany. 104pp. ISBN978-3-8433-6088-3.
Further reading
Cooper, Thomas Thornville (1873). The Mishmee Hills: An Account of a Journey Made in an Attempt to Penetrate Thibet from Assam to Open New Routes for Commerce. H.S. King & Company.