The stratigraphic correlations herein proposed were prepared by a committee consisting of the following members: Hans Frebold (chairman), Miss D. M. Loranger (co-chairman), G. Blakslee, P. Chamney, M. B. Crockford, A. Klingspor, H. Lackie, W. D. MacDonald, R. Milner, J. Peterson, G. Springer, and Miss Ruth L. Thompson.

In Saskatchewan, the basal unit of the Mesozoic is the Watrous formation (Gypsum Spring). It is considered to be pre-Middle Bajocian and its lower beds might even be Triassic in age. The Watrous is overlain by the Sawtooth formation, which is equivalent to the Gravelbourg and part of the Shaunavon. The top of the Sawtooth is still under discussion, some favor placing it at the top of the upper Shaunavon. The Gravelbourg and the lower Shaunavon are equivalents of the Middle Bajocian Rock Creek member of the Fernie group. In the plains of Alberta and Saskatchewan the upper Sawtooth may include strata of Upper Bathonian age; however, no proof is currently available. The Montana and Alberta Rierdon formation represents the Lower Callovian. In Saskatchewan the lower Vanguard and perhaps a art of the upper Shaunavon are of the same age. In the Fernie group the Lower Callovian consists of the Gray beds, which are locally replaced by the facies of the Corbula munda and Gryphaea beds. In Saskatchewan the Oxfordian is represented by the middle and upper Vanguard which are equivalent to the Alberta and Montana Swift formations and to the Green beds and lower Passage beds of the Fernie group. The presence of an unconformity at the top of the middle Vanguard is possible. The sands of the middle Vanguard pinch out to the west toward the Sweetgrass arch.

Strata of Kimmeridgian age are represented in the Fernie group by at least part of the upper Passage beds. On a micro-paleontological basis, Loranger and others regard the uppermost part of the Vanguard formation as Kimmeridgian and consider this part of the section in the Alberta and Saskatchewan Plains as part of the Montana Morrison formation.

In the subsurface of the Peace River area the Jurassic is developed as Fernie group; the Nordegg member, the Toarcian and the Rock Creek member have been recognized on a lithological basis and

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may be correlative with the Watrous, Sawtooth, Gravelbourg, and Shaunavon formations of the Plains. Higher parts of the Peace River subsurface Fernie may be correlated with the Rierdon, Swift, and Vanguard formations.

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