Figure 9.1

Distribution map showing platforms, troughs and areas from which the interval has been stripped by erosion, and locations of cross sections. Mountain areas without palinspastic restoration. Subcrop limits in the United States of America are from Kerr (1988).

Figure 9.2

Isopach map of the Middle Ordovician to Lower Devonian stratigraphic interval. Control points in the Cordillera are shown with palinspastic restoration. Most of these localities later were thrust to the northeast, but on the Cassiar Platform movement was primarily to the northwest along strike-slip faults.

Figure 9.3

Correlation chart for rock units of the Middle Ordovician to Lower Devonian stratigraphic interval (modified from Cecile and Norford, in press and Morrow and Geldsetzer, 1989).

Figure 9.4

Detailed correlation chart of Middle Ordovician to Silurian strata of the Williston Basin, North Dakota, Manitoba and Saskatchewan.

Figure 9.5

Regional cross section D"-D (Fig. 9.1), west-central Alberta. This section connects to cross section D-D' of other chapters and thereby to A-A'.

Figure 9.6

Regional cross section E-E' (Fig. 9.1), southeastern British Columbia (Purcell Platform) to southwestern Alberta (Front Ranges west of Calgary).

Figure 9.7

Regional cross section K-K' (Fig. 9.1), southeastern British Columbia (White River Trough) to southwestern Alberta (Front Ranges west of Red Deer).

Figure 9.8

Regional cross section L-L' (Fig. 9.1), east-central British Columbia to west-central Alberta.

Figure 9.9

Regional cross section M-M' (Fig. 9.1), northeastern British Columbia (Kechika Trough) to northwestern Alberta. See Figure 9.3 for nomenclatural abbreviations (OK#, OR#, SL, SD and associated informal units).

Figure 9.10

Regional cross section N-N' (Fig. 9.1), northeastern British Columbia; connects to A-A'.

Figure 9.11

Regional cross section P-P' (Fig. 9.1), southern District of Mackenzie.

Figure 9.12

Regional cross section Q-Q' (Fig. 9.1), northeastern British Columbia southeast to west-central Alberta.

Figure 9.13

Geographic limits of: c. Lake Alma and Coronach anhydrites (Herald Formation); b. Gunton anhydrite (Stony Mountain Formation), and a. Stonewall anhydrite. Distribution shown in Saskatchewan is modified from Kent (1960) and from Kendall (1976); correlations into Manitoba are tenuous and based on interpretations of geophysical logs. Map scale 1:5 000 000.

Figure 9.14

Reference well, Home Dome Torquay South, 3-8-1-11 W2, southeastern Saskatchewan (Fig. 9.1 shows location); Winnipeg through Interlake units; stratigraphic nomenclature of Ordovician strata follows Kendall (1976). Gamma-ray, density and sonic curves are illustrated. Lithologies interpreted from core (3174-3211 m), cuttings, and geophysical logs (primarily the compensated neutron-lithodensity log). Note that the vertical scale (1:2000) is much expanded from the Atlas standard (1:6000).

Figure 9.15

Regional cross section A*-A', segment of A-A'from central Alberta to southeastern Saskatchewan; datum,top of Ashern Formation. Crosses F*-F', G-G*.

Figure 9.16

Regional cross section F*-F', segment of F-F' from southeastern Alberta to east-central Saskatchewan; datum, top of Ashern Formation. Crosses A*-A.

Figure 9.17

Regional cross section G-G*, southern Saskatchewan to southern Manitoba; datum top of Ashern Formation. Crosses A*-A', H-H'.

Figure 9.18

Regional cross section H-H', south-north transect close to the Manitoba-Saskatchewan boundary; datum, top of Ashern Formation. Crosses G-G*, joins J-J'.

Figure 9.19

Regional cross section J-J', west-central Manitoba to northeastern Manitoba and adjacent Ontario (Hudson Bay Lowlands). Datum, base of Interlake and base of Severn River. J joins with H- H'; J'connects with the southwest end of a published cross section that traverses the Hudson Bay Basin (A-A' of Fig. 5 of Sanford and Grant, 1990). These authors recognize the Boas River Formation (a petroleum source rock) between the Bad Cache Rapids and the Churchill River groups in the northeastern wells shown on Figure 9.19, but this unit is too thin (less than 10 m) to be shown in the cross section.

Figure 9.20

Isopach map, pre-Winnipeg interval in the Cordillera (uppermost Lower Ordovician and lower Middle Ordovician), Tipperary, Monkman, Skoki and Owen Creek units. Control points are palinspastically restored. Most of the localities later were thrust to the northeast, but localities in the Cassiar Platform primarily were moved to the northwest along strike-slip faults.

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Figure 9.21

Structure contour and paleogeological map, Williston Basin, upper surface of the Middle Ordovician to Silurian stratigraphic interval.

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Figure 9.22

Subcrop-outcrop map, Middle Ordovician to Silurian, Williston Basin, showing Precambrian trends and post-Silurian erosional features and impact structures.

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Figure 9.23

Isopach map, Winnipeg Formation, with overprinted lithological domains.

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Figure 9.24

Isopach map, Red River Formation, with overprinted lithological domains.

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Figure 9.25

Isopach map, Stony Mountain Formation, showing the distribution of the Gunn Member (following Kendall, 1976, in Saskatchewan; distribution in Manitoba is approximate because of limited subsurface control), with overprinted lithological domains.

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Figure 9.26

Isopach map, Stonewall and Interlake units, with overprinted lithological domains.

Figure 9.27

Isopach map, Upper Silurian and Lower Devonian rocks (post-Interlake) in northeastern British Columbia (totals of Muncho-McConnell and Wokkpash formations). Control outcrop sections and wells indicated by dots; data from McMechan (1987), Taylor and MacKenzie (1970), Thompson (1989), Pugh (1976), and Norford (unpublished data). Palinspastic restorations as for Figure 9.2.

Figure 9.28

Thermal maturity data (conodont alteration indices), Middle Ordovician to Lower Devonian rocks, without palinspastic restoration.

Figure 9.29

Tyndall Limestone building stone, burrow-mottled carbonates of the Red River Formation, Gillis Quarry, Garson, Manitoba; four by four inch staves provide scale. Photograph R.K. Bezys.

Figure 9.30

Resistant formations of the Bow Platform, Mt. Wilson section, southwestern Alberta, the standard section for the Ordovician rocks of the Southern Rocky Mountains. The Beaverfoot Formation (Ob) overlies the prominent cliff formed by the Mount Wilson Quartzite (Omw) near the top of the mountain. The ridge outcropping within the trees is the Upper Cambrian Mistaya Formation (Cm). The lower Survey Peak Formation forms the recessive interval that is overlain by cliff outcrops of the Survey Peak (Osp), Outram (Oo), Skoki (Os) and Owen Creek (Ooc) formations. Photograph B.S.Norford (GSC photo no.118950).