With the Mangala oil discovery in 2004, Cairn established the Barmer Basin of Rajasthan as a major new hydrocarbon province. Most reserves are contained in fluvial sandstone reservoirs of the Fatehgarh Formation, which probably ranges in age from Late Cretaceous to Early Paleocene. The Fatehgarh sandstones were mainly derived from reworking of Mesozoic sandstones at the northern end of the Barmer rift, but with some volcaniclastic input probably derived from Deccan volcanic rocks within and on the margins of the rift. These thick, quartz-rich, high porosity and permeability sandstones provide an excellent oil reservoir in the north of the Barmer Basin, but the increasing volcanic influence further south causes reservoir quality and thickness of net sand to deteriorate. This paper relates how the tectonic and volcanic evolution of the northwest margin of the Indian plate has influenced the depositional trends which have resulted in formation of this world class reservoir.

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Four teams took part in field work in the 1976 season, the penultimate in the project started in 1972 to map the 1:100 000 scale Buksefjorden sheet. Chadwick completed mapping Angissorssuaq and surrounding islands; Coe worked between Taserssuatssiat and Alángordlia; Compton mapped between the western part of Taserssuatssiait and Buksefjorden, and Nutman began a detailed study of Amitsoq gneisses and rocks ofthe Akilia association in the Narssaq peninsula and islands to the south and west. As in the first two years of the project, the programme was not run from a GGU base camp, but help from staff at the Itivnera base in Godthåbsfjord is acknowledged. Valuable assistance was also received from officials at Nordafar. We also wish to acknowledge the help given (often under great difficulties) by GGU skipper Flemming Nielsen and his crew and by staff and pilots of Greenlandair Charter AIS.

1975 was the fourth ofa six year mapping project of the Buksefjorden map sheet 63 V. 1 Nord. By the end of the season 85 % of the sheet had been completed. Four teams took part: J. G. S. continued mapping north of Buksefjorden and extended his area to Ameralik so as to include important fold closures; K. J. V. continued in the area between Alângordlia and Taserssuatsiait; K. C. extended his area south to Taserssuatsiait and P. C. began mapping south of the central Buksefjorden coast. Base for the operation.s was Midgård (Kalsbeek, this report).

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