In September, 2010, the geology stream of the Geological Survey of India (GSI), was constituted as 'Central Geological Service' and commonly referred as Central Geological Service (CGS) (केन्द्रीय भूवैज्ञानिक सेवा). The Central Geological Service (CGS) is one of the central natural resource services which is part of the executive branch of the Government of India. The Central Geological Service (formerly Geology stream of GSI) was constituted as an Organized Group ‘A’ Gazetted Service as per DOPT OM No. I-11019/12/2008-CRD dated 19/11/2009 by the Cadre Controlling Authorities.