Thomas Gold Ithaca, N.Y. The final results are in from the first major drilling operation undertaken to explore the deeper levels of the Siljan ring impact crater in Central Sweden. The results demonstrate that hydrocarbon gases from methane to pentane-as well as a light, largely saturated oil-are present deep in the granitic rock. The impact crater, generated 360 million years ago by a major meteorite, is now a circular area about 44 km across. EARLY INVESTIGATIONS Investigation of this area as a possible oil and gas prospect began in 1982 on the basis that the fracturing caused by the impact may h...

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