a government-sponsored organization working in the field of geology, such as the US Geological Survey, the Geological Survey of India, or the Institute of Geological Sciences (UK)
Geological Survey in American English
noun
1. U.S. Government
a division of the Department of the Interior, created in 1879, that studies the nation's water and mineral resources, makes topographic surveys, and classifies and leases public lands
2. (lc)
a systematic investigation of the geology of an area