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Pune is also one of the fastest growing cities in the Asia-Pacific region, and was ranked as a Beta world city by Globalization and World Cities Research Network. Pune is situated on an old volcanic plateau that extends well into the surrounding hills. The oldest rock exposures are Stenusian (cambrian) cinders or sedimentary exhalations dated to c. 500 million years ago; they are called "Deccan Traps" which form part of its basalts from Pune's Deccan Volcanic Province (DVP). According to author Walter Gehlhar, these basalts have been known since about 1790 but were not studied scientifically until 1828 when James Scurry examined them at Cawasji Naik's observatory near Poona College after noticing their erosion features caused by weathering during heavy rains in 1827–1828 . They were described for science by Robert Ruttenber who accompanied Charles Malet on his geological survey between 1860 and 1862 .