Table 2: Main hill ranges in the Eastern GhatsName <str<strong>on</strong>g>of</str<strong>on</strong>g> the hills, districtNorthern Eastern GhatsOrissa—Districts <str<strong>on</strong>g>of</str<strong>on</strong>g> Sambalpur and Bolangir(Gandhamardan hills), Mayurbhanj and Kalahandi(Kh<strong>on</strong>dmal hills), Phulbani and KoraputAndhra Pradesh—Srikakulam (Palak<strong>on</strong>da-Antik<strong>on</strong>da-Burrak<strong>on</strong>da ranges), Vizianagaram andVisakhapatnam (Madgole hills-Ananthagiri-Chintapalli-Sapparla-Gudem-Marripakalau hillranges), East Godavari (Gurtedu-Addateegala-Rampachodavaram-Maredumalli ranges), WestGodavari (Polavaram, Papik<strong>on</strong>da ranges)Altitudes <str<strong>on</strong>g>of</str<strong>on</strong>g> the hillsAltitude <str<strong>on</strong>g>of</str<strong>on</strong>g> above 400 m, few peakswith above 1,100 m. Mahendragiri1,510 m, Debmali Prabar 1,672 m(Koraput district), Koraput 1,515 m,Singaraju Parbar 1,516 m, Devagiri1,381.2 m, Turiaki<strong>on</strong>da 1,598 m,Hatimali 1,391 m, Chandragiri1,269 m, Armak<strong>on</strong>da 1,680 m,Dharak<strong>on</strong>da 1,365 m, Sambarik<strong>on</strong>danear Gudem village 1,527 m,Galik<strong>on</strong>da 1,643 mMiddle Eastern GhatsAndhra Pradesh—District <str<strong>on</strong>g>of</str<strong>on</strong>g> Krishna (K<strong>on</strong>dapalliranges), Kurnool, Mahabubnagar, Prakasam(Nallamalai hills), Anantapur, Cuddapah, Chittoor andPrakasam (Palak<strong>on</strong>ga-Seshachalam-Lankamala-Nagari hills) and Nellore (Velig<strong>on</strong>da range)Average elevati<strong>on</strong> 750 m.Nallamalais 800 m, Seshachalamhills 850 mSouthern Eastern GhatsTamil Nadu—North Arcot (Javadi hills), South Arcot(Gingee hills), Salem (hills <str<strong>on</strong>g>of</str<strong>on</strong>g> Shevaroy, Kollimalaihills, Kalrayan and Bodamalai), Dharmapuri (Melahirihills), Tiruchirapalli (Pachamalai hills)Javadi hills up to 1,375 m,Pachamalais hills up to 1,000 m.Shervaroy hill (400–1,600 m), Kolihills 1,000–1,500 mSource: Sandhya Rani, S and T. Pullaiah. 2002. A tax<strong>on</strong>omic survey <str<strong>on</strong>g>of</str<strong>on</strong>g> trees in Eastern Ghats. In: Proceedings<str<strong>on</strong>g>of</str<strong>on</strong>g> the Nati<strong>on</strong>al Seminar <strong>on</strong> C<strong>on</strong>servati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> Eastern Ghats, 24–26 March 2002, Tirupati, Andhra Pradesh, India.Pp 5–15.Geology and mineralsThe Eastern Ghat belt is comm<strong>on</strong>ly referredto as the Eastern Ghats granulite belt ingeological nomenclature. The belt extendsfor 1,000 km in a northeast-southwestdirecti<strong>on</strong> al<strong>on</strong>g the east coast <str<strong>on</strong>g>of</str<strong>on</strong>g> India. Thebelt seems to have developed in two stagesduring the early Proterozoic and middle tolate Proterozoic ages. The predominantlithounits in the belts are kh<strong>on</strong>dalites,charnockites, basic granulites, leptynites,megacrystic granites while the intrusivec<strong>on</strong>sists <str<strong>on</strong>g>of</str<strong>on</strong>g> alkaline, ultramafic, anorthositic(layered and massive) rocks distributed atmany tect<strong>on</strong>ically disturbed z<strong>on</strong>es <str<strong>on</strong>g>of</str<strong>on</strong>g> the belt.The two most typical rock types <str<strong>on</strong>g>of</str<strong>on</strong>g> theEastern Ghats are charnockites andkh<strong>on</strong>dalites and are <str<strong>on</strong>g>of</str<strong>on</strong>g> the Precambrian age.The early British geologists coined thenames in India, the former after JobCharnock the founder <str<strong>on</strong>g>of</str<strong>on</strong>g> Calcutta and thelatter named by the geologist TL. Walkerafter the Kh<strong>on</strong>d tribes <str<strong>on</strong>g>of</str<strong>on</strong>g> Orissa. Such rocks8
are typical <str<strong>on</strong>g>of</str<strong>on</strong>g> high metamorphic gradesknown as granulites and rocks <str<strong>on</strong>g>of</str<strong>on</strong>g> granuliteprovinces are known to have formed bymetamorphism at high temperatures andsubstantial depth. The geochr<strong>on</strong>ologic dataso far available suggests that the EasternGhats were subjected to high grademetamorphic c<strong>on</strong>diti<strong>on</strong>s over a periodextending over thousands <str<strong>on</strong>g>of</str<strong>on</strong>g> milli<strong>on</strong>s <str<strong>on</strong>g>of</str<strong>on</strong>g>years. Thus the terrain being <strong>on</strong>e <str<strong>on</strong>g>of</str<strong>on</strong>g> highgrade metamorphic rocks, it c<strong>on</strong>tainsminerals appropriate to origin under suchc<strong>on</strong>diti<strong>on</strong>s and also minerals produced byweathering processes. The high temperatureminerals include graphite, crystallinemarble, manganese ore and gemst<strong>on</strong>es.Products <str<strong>on</strong>g>of</str<strong>on</strong>g> weathering include oxidisedproducts <str<strong>on</strong>g>of</str<strong>on</strong>g> manganese ore and bauxites.Morphologically the area exhibits c<strong>on</strong>icalhills, gently sloping plateaus and broad,c<strong>on</strong>fined valleys. Bauxite deposits occurmostly <strong>on</strong> the gentle to moderately slopingplateaus. Kh<strong>on</strong>dalite, in general forms thehills, while the charnockite occupy thelower slopes and intervening valleys. Theminerals <str<strong>on</strong>g>of</str<strong>on</strong>g> ec<strong>on</strong>omic importance in theGhats thus include limest<strong>on</strong>e, bauxite,chromite, graphite, manganese, mica, coal,asbestos, barite ir<strong>on</strong> ore and tungsten. Otherminerals like apatite, clays, building st<strong>on</strong>esand quartz are also found. Gem st<strong>on</strong>es andsemi-precious st<strong>on</strong>es like ruby,chroysoberyl, chrysoberyl cats eye,mo<strong>on</strong>st<strong>on</strong>e, diopside, apatite, alexandrite,zirc<strong>on</strong>, sillimanite, garnet and tourmalineare also found to occur in several parts <str<strong>on</strong>g>of</str<strong>on</strong>g>the Ghats.Threats to and c<strong>on</strong>servati<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g>the Eastern GhatsThe Eastern Ghats are today under severeenvir<strong>on</strong>mental stress and many <str<strong>on</strong>g>of</str<strong>on</strong>g> thenatural resources therein are not beingmanaged <strong>on</strong> sound ecological principles toensure sustainable yields. The forest coverin the Ghats is diminishing at a much fasterrate than the replenishment, so also are thereother changes that are affecting the socialand ec<strong>on</strong>omic milieu <str<strong>on</strong>g>of</str<strong>on</strong>g> the regi<strong>on</strong>. Thereare multiple causes for this—developmentactivities, like hydro-electric dams, miningand irrigati<strong>on</strong> projects leading todeforestati<strong>on</strong> and displacement, governmentprogrammes like forestry [joint forestmanagement (JFM), community forestmanagement (CFM)] and m<strong>on</strong>ocultures(c<str<strong>on</strong>g>of</str<strong>on</strong>g>fee, cashew, etc) adversely impactingthe envir<strong>on</strong>ment, livestock and grazingaffecting the vegetati<strong>on</strong>, unscientificextracti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> NTFP that is depleting theresources, forest fires caused accidentally orwillfully destroying forest cover and in turncausing soil erosi<strong>on</strong>, increasing tourism andits pressure <strong>on</strong> the ecology, biodiversitybeing lost as result <str<strong>on</strong>g>of</str<strong>on</strong>g> introducti<strong>on</strong> <str<strong>on</strong>g>of</str<strong>on</strong>g> exoticspecies like tropical pines, eucalyptusplantati<strong>on</strong>s and invasive species likelantana, ipomea, jatropha, etc., an increasingtribal populati<strong>on</strong> and more so, an increasingexternal populati<strong>on</strong> settling down in thesehill areas, straining the land and limitedresources, and the rising incidents <str<strong>on</strong>g>of</str<strong>on</strong>g>wildlife trade and wood smuggling. Allthese have impacted the diversity andabundance <str<strong>on</strong>g>of</str<strong>on</strong>g> biodiversity and in turn thelifestyles <str<strong>on</strong>g>of</str<strong>on</strong>g> the people, primarily theadivasis <str<strong>on</strong>g>of</str<strong>on</strong>g> the regi<strong>on</strong>. The roots, tubers,medicinal plants and small animals thatform a part <str<strong>on</strong>g>of</str<strong>on</strong>g> the tribal peoples’ diet aredepleting resources and affecting adverselythe nutriti<strong>on</strong>al balance <str<strong>on</strong>g>of</str<strong>on</strong>g> the adivasis.Livelihoods have also been affected; withforests disappearing resources like grass forthatch, wood for house c<strong>on</strong>structi<strong>on</strong> andagricultural implements, and fodder andgrazing land for livestock is becomingscarce.The Western Ghats has receivedc<strong>on</strong>siderable and c<strong>on</strong>sistent attenti<strong>on</strong> fromthe envir<strong>on</strong>ment lobby in the country as aresult <str<strong>on</strong>g>of</str<strong>on</strong>g> its very rich biodiversity. However,threats to the Eastern Ghats are by no meansany less serious. Organisati<strong>on</strong>s have beenworking in the regi<strong>on</strong> too—some <strong>on</strong> issues9