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Since the earliest geological investigations on the central Alberta plains, the transition of Upper Cretaceous Montanan deposits from continental beds in the west to marine beds in the east has presented great difficulties in both surface and subsurface mapping. Accelerated petroleum exploration activity in the past 5 years has resulted in a large amount of new subsurface information on which to determine stratigraphical relationships. This paper describes and illustrates with one map and three cross sections, these relationships for the Lea Park and Belly River formations; the younger Bearpaw and Edmonton formations also enter into the discussions insofar as they are involved in the main subject.

The interfingering of the marine Lea Park formation with the predominantly non-marine Belly River formation makes possible the recognition of ten members which are somewhat arbitrarily placed in the latter formation. Each of these members has been described previously but most of them have been given more than one name because of uncertainties in correlation between localities. The present study, aided by a greater density of subsurface data, has, it is sincerely believed, succeeded in making sufficiently accurate correlations throughout east-central Alberta to justify discarding several local formation and member names. The correlations are based on lithologic, microfaunal, and elec- tric-log data, although the cross-section illustrations include only the last criteria.

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