Figure 7.1

Correlation chart showing the composite stratigraphic succession for the eastern and western parts of the cratonic platform, and for the cratonic margin. The cratonic margin columns, where possible, identify stratigraphic units at the platform margin and in the deep basin for areas both north and south of the Peace River Arch/Embayment. The extreme right hand column lists the chapters to which the reader may refer for more detailed information on lithologies and facies relations.

Figure 7.2

Paleogeography of the cratonic platform and margin in the Cambrian-Early Ordovician interval. The flooding surface over which the Cambrian sea transgressed the platform was not flat, but was, in fact, interrupted by several Precambrian monadnocks, particularly on the eastern platform (Sawatzky et al., 1960).

Figure 7.3

Paleogeography of the cratonic platform and margin during subinterval OS1. The sandstone/mudrock relation in Manitoba is more complex than can be illustrated on a map, because the sandstones and mudrocks are interbedded and in places there are localized thick accumulations of one rock type or the other (Andrichuk, 1959; Vigrass, 1971).

Figure 7.4

Paleogeography of the cratonic platform and margin during subinterval OS2. The deposits of the hypersaline basin are dominantly layered anhydrite. Rocks beyond the limits of the hypersaline basin are intensely dolomitized and their origin is not easily determined; however, they are thought to have been shallow marine.

Figure 7.5

Paleogeography of the cratonic platform and margin during subinterval OS3. The environment illustrated as muddy is, in fact, an argillaceous carbonate with some interlaminated mudrock.

Figure 7.6

Paleogeography of the cratonic platform and margin during subinterval OS4. Note the locations of reefs in this carbonate seaway.

Figure 7.7

Paleogeography of the cratonic platform and margin during subinterval DM2. Moore (1989) showed the La Crete sub-basin isolated from both the Black Creek sub-basin and the Saskatchewan sub-basin by extensive carbonate banks. This map depicts a more conservative interpretation. The evaporite infill in the basin includes anhydrite on the basin floor and enclosing the reefs, and halite and potash across the central portion of the Saskatchewan sub-basin.

Figure 7.8

Paleogeography of the cratonic platform and margin during subinterval DM3. Fine-grained siliciclastics of the basinal marine deposits are interpreted as having been sourced in the hinterland to the north and east.

Figure 7.9

Paleogeography of the cratonic platform and margin during subinterval DM4. The outline of reefs on the cratonic margin is based largely on Moore (1989). Palinspastic restoration of their positions stems from Mountjoy (1980). The hypersaline basins on the eastern platform have some anhydrite but contain mainly halite. Thicknesses of the evaporites are in the order of 30 m (Kent, 1968b; Dunn, 1976).

Figure 7.10

Paleogeography of the cratonic platform and margin during subinterval DM5. The distribution of Lower Carboniferous lithofacies suggests deposition on a relatively narrow shelf (similar to the coast of the United Arab Emirates of the Persian Gulf), leading to the inferred location of the Lower Carboniferous shoreline and the landward coastal sabkha.

Figure 7.11

Schematic cross section depicting the lithofacies distribution of the Mississippian shelf-to-basin transition (after Sereda and Kent, 1987).

Figure 7.12

Paleogeography of the cratonic platform and margin during the Rundle-Mission Canyon subinterval (DM6). Continental sabkhas inferred.

Figure 7.13

Paleogeography of the cratonic platform and margin during the Permian part of subinterval PT1.

Figure 7.14

Paleogeography of the cratonic platform and margin during the Triassic subinterval (PT2).