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Volume 30: British Lower Jurassic Stratigraphy — Chapter 08
 

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Chap 01
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Chap 02
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Chap 03
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Chap 04
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Chap 05
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Chap 06
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Chap 07
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Chap 08
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Figure 8.1
Map of the Jurassic (including Lias Group) outcrop in western Scotland, showing the locations of the GCR sites, indicated in bold, as follows: AI– Aird na h-Iolaire; AL– Allt Leacach; B– Boreraig to Carn Dearg; CC– Cadha Carnach; H– Hallaig; OL– Ob Lusa to Ardnish; PC– Prince Charles’ Cave to Holm; RL– Rubha na Leac. After Hesselbo et al. (1998).

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Figure 8.2
Chronostratigraphical (stages) and lithostratigraphical nomenclature of the Lower Jurassic Series in the Hebrides, with genetic stratigraphical sequences (after Morton, 1989) and sequence stratigraphy (based on Hesselbo and Jenkyns, 1998; and Hesselbo et al., 1998).

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Figure 8.3
Geological map of the Ob Lusa to Ardnish area, eastern part of Broadford Bay, Isle of Skye. The GCR site includes the coastal outcrops from Ob Lusa west to the eastern parts of Ob Breakish and the Ardnish Peninsula. After D.J. Taylor, 1981, BSc thesis, Birkbeck College.

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Figure 8.4
Succession through the Breakish Formation at Ob Lusa (NG 6998 2492 to NG 6972 2512). After D.J. Taylor and C. Cointet, modified from Morton and Hudson (1995). The bed numbers of Hesselbo et al. (1998) are shown in square brackets.

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Figure 8.5
Succession in the Ardnish Formation in the Ardnish Peninsula. After D.J. Taylor and C. Cointet, modified from Morton and Hudson (1995). Bed numbers have been revised to start the base of the Ardnish Formation as Bed 1 (= Bed 18 of Morton and Hudson, 1995). The bed numbers of Hesselbo et al. (1998) are shown in square brackets.

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Figure 8.6
Map of Hallaig and the Hallaig Shore area, showing the main topographic features, the limits of the Hallaig landslip and the location of the GCR site. Selected dip arrows shown indicate the effects of the rotation associated with the landslip. The probable position of the Portree Shale and Raasay Ironstone formations, which are not exposed, is interpolated.

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Figure 8.7
Detailed succession of the uppermost Pabay Shale Formation and lower Scalpay Sandstone Formation, together with records of ammonites and some other key fossils. Bed numbers are those of Howarth (1956), on whose work this figure is mainly based, with additional information from Hesselbo et al. (1998) and Phelps (1985). Note that Bed 3 is 4 m thicker than shown here. The boundary between the Pabay Shale and Scalpay Sandstone formations is transitional but taken at the base of Bed 4. Beds 14 to 18 are distinctive marker beds allowing correlation with other sections on Raasay, including the GCR sites at Rubha na’ Leac 1.5 km to the south, and Cadha Carnach 1 km to the north.

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Figure 8.8
View from Rubha na’ Leac of the prominent peak of Dun Caan and the cliffs of Drum an Aonaich and Cadha Carnach. The main cliff is of Bearreraig Sandstone Formation above a slope developed on the Portree Shale and Raasay Ironstone formations, with the Scalpay Sandstone Formation forming the lower part of the cliff down to sea level. (Photo: N. Morton.)

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Figure 8.9
Geological map of the area around Dun Caan, Isle of Raasay, based on the author’s mapping and that of Bradshaw and Fenton (1982). The locations of Tait’s trench and the Raasay Ironstone/Portree Shale localities to the north are taken from part of the [British] Geological Survey field slip for Sheet Inverness 31NW.

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Figure 8.10
Succession from the Scalpay Sandstone Formation to the Dun Caan Shale Member north-east of Dun Caan, Isle of Raasay, based on Howarth (1956), Lee (1920) and Morton (unpublished). Bed numbers for the Scalpay Sandstone Formation are modified from those of Howarth, in brackets where this was based on other localities on Raasay.

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Figure 8.11
Simplified geology and locality map of the Storr Lochs–Holm–Prince Charles’ Cave area north of Portree, Trotternish, Isle of Skye, showing locations of the main sections (especially for the Toarcian Stage).

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Figure 8.12
Succession from the upper Scalpay Sandstone Formation to the Dun Caan Shale Member at Trotternish, north of Portree, Isle of Skye, based mainly on unpublished descriptions by Bruce Farrer (1994), observations by Morton (unpublished), and data from Murray Edmunds (unpublished) and Lee (1920). The composite section is based on three main localities: south of Holm (NG 520 506) (by Nicol Morton); between Holm and Prince Charles’ Cave (approx. NG 518 490) (by Bruce Farrer) and south of Prince Charles’ Cave (NG 515 471) (Bruce Farrer and Nicol Morton).

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Figure 8.13
Geological map of the northern part of Beinn na Leac and Rubha na’ Leac area, showing the main topographic features and localities described in text. The boundary of the notified GCR site is also shown.

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Figure 8.14
Scalpay Sandstone Formation exposed in the cliff at Rubha na’ Leac, Raasay. (Photo: N. Morton.)

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Figure 8.15
Succession through the Scalpay Sandstone Formation, Portree Shale Formation (not exposed) and Raasay Ironstone Formation in the shore, cliffs and hillside south and south-west of Rubha na’ Leac and the north-east corner of Beinn na Leac, partly modified from Howarth (1956). Bed numbers for the Scalpay Sandstone Formation are those of Howarth’s composite measured succession, continued upwards, in brackets where this was based on other localities on Raasay.

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Figure 8.16
Simplified geology and topography map of the western part of the Ardmeanach Peninsula, western Mull. The two main localities discussed, Aird na h-Iolaire and Allt na Teangaidh, Gribun, are indicated.

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Figure 8.17
Uppermost Triassic and lowermost Jurassic measured succession just south of Aird na h-Iolaire, based mainly on Oates (1976) with additional data from Lee and Bailey (1925) and Oates (1976). The bed numbering is added here for reference.

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Figure 8.18
Composite section through the Lias Group exposed at the Boreraig to Carn Dearg GCR site, Loch Eishort. After Hesselbo et al. (1998).

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Figure 8.19
Geological sketch map of Loch Aline and Allt Leacach.

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Figure 8.20
The lower cascade at Allt Leacach, showing typical limestone–mudstone alternations of the Blue Lias Formation. The mudstone-dominated Bed 30 is represented by the conspicuous undercut about halfway up the cascade. (Photo: M.J. Simms.)

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Figure 8.21
Section through the Blue Lias and Pabay Shale formations exposed in Allt Leacach. After Hesselbo et al. (1998).

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