The increasing importance of Virden-Roselea and North Virden oil production has made it desirous that a workable subdivision of Lodgepole stratigraphy be undertaken for this area and for adjoining regions wherever correlation is satisfactory. The present paper proposes a member breakdown of the Lodgepole of the Virden area, and describes these units in some detail from type wells of the vicinity.

Due to lithologic variations resultant from changes in depositional environment within the preserved portion of the Lodgepole of the eastern Williston basin, the proposed stratigraphic units are applicable in general only to the eastern portion of the Manitoba and northern North Dakota sections. Recognizable correlation becomes increasingly difficult and unreliable rather abruptly westward of a northerly-trending narrow zone of demarcation. Correlation east of this zone, however, is generally good and can be referred readily to the Virden type section. Despite the limited areal extent of application, the economic importance of this region warrants systematic stratigraphic subdivision.

End_of_Article - Last_Page 422------------