Chapter 28 Figures
Geological History of the Peace River Arch

Figure 28.1

The principle positive cratonic features present at the western margin during the Paleozoic.

Figure 28.2

The Peace River Arch study area showing the well control. The structural boundaries of the arch are indicated by the dashed lines (from Fig. 28.5).

Figure 28.3

North-south cross section across the Peace River Arch from the top of the Devonian to the top of the Precambrian. The location of the section is shown in Figure 28.4. Vertical exaggeration is 58:1.

Figure 28.4

Isopach map from the top of the Devonian to the top of the Precambrian in the Peace River Arch area.

Figure 28.5

Structure contour map of the Precambrian surface in the Peace River region (Trotter, 1989). Contour interval is 20 m. The approximate edges of the arch are shown as dashed lines.

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Figure 28.6

Tectonic domains in the basement of the Peace River region (Ross, 1990) based on the interpretation of aeromagnetic anomaly data and U-Pb geochronology. Dashed lines indicate the approximate structural edges of the arch.

Figure 28.7

Stratigraphic cross section of Lower and Middle Cambrian strata across the western extension of the Peace River Arch (McMechan,1990), showing the thinning of Gog Group sediments over the arch.

Figure 28.8

Granite Wash isopach map (Trotter, 1989). Granite Wash sediments form elongate bodies along the crest of the arch and also flank the southern and northern arch margins.

Figure 28.9

Isopach map of the Upper Devonian Beaverhill Lake Group (Keith, 1990) showing the gradual thinning of the unit as it onlaps the arch.

Figure 28.10

Outline of the Upper Devonian Leduc Formation carbonate platform encircling the Peace River Arch landmass (Dix, 1990).

Figure 28.11

Regional tectonic elements during the Early Carboniferous(Richards, 1989) showing the Peace River Embayment as an eastward extension of the Prophet Trough.

Figure 28.12

Isopach map of the Lower Carboniferous Banff Formation (O'Connell, 1990). The main depocentre was north of Twp. 87; the formation thins over the crest of the underlying Devonian arch.

Figure 28.13

Isopach map of the uppermost Pekisko Formation 'PS2' shale (Lower Carboniferous) (O'Connell, 1990). This shows that the main depocentre of Pekisko deposition was located approximately along Twp. 86, which is to the north of the crest of the Devonian arch.

Figure 28.14

Main tectonic elements of the Carboniferous to Permian Dawson Creek Graben Complex showing the depositional limits of the Lower Carboniferous Stoddart Group, the Permian Belloy Formation, and the Triassic succession. Modified after Barclay et al. (1990).

Figure 28.15

Sketch of the Carboniferous-Permian Dawson Creek Graben Complex.G olata, Kiskatinaw, Taylor Flat, and Belloy formations successively filled the developing graben complex (Barclay et al., 1990).

Figure 28.16

Isopach map of the Lower Carboniferous Stoddart Group (Barclay et al., 1990) showing the interpreted structural boundaries of the Dawson Creek Graben Complex.

Figure 28.17

Isopach map of the Jurassic Fernie Group (including the Nordegg Formation) (Poulton et al., 1990). The position of the underlying Dawson Creek Graben Complex (from O'Connell et al., 1990) is shown by the shaded zone within the dashed lines.

Figure 28.18

Isopach map of the Lower Cretaceous Bluesky Formation (O'Connell et al., 1990). The position of the underlying Dawson Creek Graben Complex is shown by the shaded zone within the dashed lines. A large, shallow-marine Bluesky sand body coincides approximately with the underlying Dawson Creek structure.