It is shown that the major part of the Bouguer gravity anomaly field over central Alberta must be attributed to lithological changes in the Precambrian basement beneath the sedimentary section. By making use of the petrology and physical properties of samples from wells that have reached the Precambrian, in conjunction with the gravity data, a lithological map of the basement has been produced. The covered shield can be traced to the region beneath the Rocky Mountains, at least as far west as Banff. Depth estimates made from gravity profiles strongly suggest that the Precambrian has been uplifted beneath the mountains.

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