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Volume 26: British Middle Jurassic Stratigraphy — Chapter 06
 

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Chap 06
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Figure 6.1
Geological sketch maps showing the location of the GCR sites described in Chapter 6. (1) Brora (Bathonian); (2) Brora (Callovian); (3) Cadh’-an-Righ; (4) Isle of Eigg; (5) Elgol–Glen Scaladal; (6) North Elgol Coast; (7) Dun Skudiburgh; (8) Duntulm (Cairidh Ghlumaig and Lon Ostatoin); (9) Staffin Bay; (10) Staffin; (11) Valtos; (12) Bearreraig Bay; (13) Beinn na Leac.

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Figure 6.2
Lithostratigraphy of the Middle Jurassic rocks of the Isle of Skye and the Isle of Raasay (Inner Hebrides). Not to scale. (* = presence of zone indicated by ammonites.)

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Figure 6.3
Lithostratigraphy of the Middle Jurassic rocks of north-east Scotland. Not to scale. (* = presence of zone indicated by ammonites.)

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Figure 6.4
Locality and geological sketch map for the Brora (Bathonian) GCR site. (After Hurst (in Trewin and Hurst, 1993, figs 1,3).)

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Figure 6.5
Graphic section of the Brora Coal Formation at the Brora (Bathonian) GCR site. (After Hurst (in Trewin and Hurst, 1993, fig. 4).)

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Figure 6.6
Locality map for the Brora (Callovian) GCR site.

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Figure 6.7
Correlation between the Callovian sections at the Brora (Callovian) and Cadh’-an-Righ GCR sites. (After Sykes, 1975, fig. 7.)

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Figure 6.8
Sketch maps showing the relative positions of the Brora and Cadh’-an-Righ outcrops (a) after, and (b) before post-Jurassic movement along the Great Glen Fault. (After Sykes, 1975, fig. 2.)

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Figure 6.9
Locality map for theIsle of Eigg GCR site, which comprises three separate localities. (A) Coast north of Kildonnan; (B) Bogha na Brice-nis to Bay of Laig; (C) Laig Gorge.

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Figure 6.10
Camas Sgiotaig, Isle of Eigg. The sea cliffs are of Valtos Sandstone Formation, which gives rise to the pure white ‘singing sands’ of the beach. (Photo: British Geological Survey, No. D1706; reproduced with the permission of the Director, British Geological Survey, © NERC, 1974.)

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Figure 6.11
Geological sketch map of the type locality of the Kildonnan Member (Lealt Shale Formation) on the coast north of Kildonnan, Isle of Eigg (for bed numbers, see Figure 6.12). (After Emeleus, 1997, fig. 12.)

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Figure 6.12
Graphic section of the Kildonnan Member at its type locality. (After Emeleus, 1997, fig. 13.) Bed numbers follow Wakefield (1991).

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Figure 6.13
Outcrop map of the Valtos Sandstone Formation between Bogha na Brice-nis and Bay of Laig,Isle of Eigg. (After Emeleus, 1997, fig. 14.) Division letters follow Harris (1984).

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Figure 6.14
Graphic section of the Duntulm and Kilmaluag formations at Laig Gorge, Isle of Eigg. (After Emeleus, 1997, figs 17,18). Bed and facies numbers follow Andrews (1984, 1985).

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Figure 6.15
Locality map for theElgol–Glen Scaladal GCR site.

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Figure 6.16
Cliffs of Elgol Sandstone Formation behind the school (centre right) at Elgol. The Cuillin Hills are in the background. (Photo: M.G. Sumbler.)

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Figure 6.17
Graphic section of the Elgol Sandstone Formation at its type locality. (After Morton and Hudson, 1995, fig. 19.)

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Figure 6.18
Graphic section of the Lealt Shale Formation on the coast north of Elgol, Isle of Skye. (After Wakefield, 1994, fig. 50.) Bed numbers follow Andrews (1984).

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Figure 6.19
Graphic section of the Valtos Sandstone Formation on the coast north of Elgol, Isle of Skye. (After Morton and Hudson, 1995, fig. 20.)

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Figure 6.20
Composite graphic section of the Duntulm Formation at Elgol–Glen Scaladal. (After Emeleus, 1997, fig. 17.) Bed and facies numbers follow Andrews (1984).

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Figure 6.21
Graphic section of the Kilmaluag Formation, north of Elgol, Isle of Skye. (After Morton and Hudson, 1995, fig. 23.) Bed numbers follow Andrews (1984).

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Figure 6.22
Main lithologies, fossils and depositional environments of the Great Estuarine Group of the Inner Hebrides. (After Hudson et al., 1995, fig. 1.)

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Figure 6.23
Correlation between the Callovian sections at North Elgol and Staffin. (After Sykes, 1975, fig. 7.)

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Figure 6.24
Locality map for the Dun Skudiburgh GCR site.

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Figure 6.25
Graphic section of the Skudiburgh Formation at Dun Skudiburgh. (After Andrews, 1985, fig. 7.) Bed numbers follow Andrews (1984, 1985).

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Figure 6.26
Low cliff exposure of the Skudiburgh Formation beneath the picrite–dolerite sill at Dun Skudiburgh. (Reproduced by kind permission of the Geologists’ Association.)

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Figure 6.27
Locality map for the Duntulm GCR site. (After Morton and Hudson, 1995, fig. 35.)

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Figure 6.28
Foreshore exposures of the Duntulm Formation in Cairidh Ghlumaig south of Duntulm Castle. (Photo: M.G. Sumbler.)

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Figure 6.29
Graphic sections of the Duntulm and Kilmaluag formations exposed at the Duntulm GCR site. (After Andrews, 1985, fig. 3; and Morton and Hudson, 1995, fig. 36.) Bed numbers follow Andrews (1984, 1985).

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Figure 6.30
General view of Staffin Bay looking north-west. The foreshore exposures on the far side of the bay comprise the GCR site. (Photo: M.G. Sumbler.)

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Figure 6.31
Locality and geological sketch maps for the Staffin Bay GCR site. (Partly based on Andrews, 1984, fig. 7.)

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Figure 6.32
Graphic section of the Skudiburgh Formation at Staffin Bay. (After Andrews, 1985, fig. 7.) Bed numbers follow Andrews (1984, 1985).

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Figure 6.33
Locality map for the Staffin GCR site.

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Figure 6.34
Main stratal divisions of the Callovian succession at Staffin. Not to scale. (* = presence of subzone indicated by ammonites.)

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Figure 6.35
Locality map for the Valtos GCR site which comprises three separate localities. (A) Invertote and Lealt River; (B) Rubha nam Brathairean (Sgeir Dhubh to mouth of Lonfearn Burn); (C) Valtos to Mealt Falls.

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Figure 6.36
The Lealt River gorge showing the first waterfall (formed by a dolerite sill) below the road bridge. The upper part of the Lealt Shale Formation is exposed above the waterfall. (Photo: M.G. Sumbler.)

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Figure 6.37
Graphic section of the Lonfearn Member (Lealt Shale Formation) at its type locality. (After Harris and Hudson, 1980, fig. 6.) Bed numbers follow Harris and Hudson (1980).

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Figure 6.38
Looking south from the Mealt Falls viewpoint at the high cliffs of the Valtos Sandstone Formation below Dun Dearg. The promontory of Rubha nam Brathairean is seen in the far distance. (Photo: M.G. Sumbler.)

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Figure 6.39
Graphic section of the Valtos Sandstone Formation at its type locality. (After Harris and Hudson, 1980, fig. 7.) Bed numbers follow Harris and Hudson (1980).

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Figure 6.40
Concretions in the type section of the Valtos Sandstone Formation (formerly known as the ‘Concretionary Sandstone Series’). (Photo: J.D. Hudson.)

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Figure 6.41
Geological map of Bearreraig Bay, Trotternish, Isle of Skye. (After Morton and Hudson, 1995, fig. 24.)

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Figure 6.42
View of cliffs south of Bearreraig Bay, from a point east of the hydroelectric power station. The Ollach Sandstone Member forms the foreshore and cliff in the foreground, with the Murchisonae Zone fossiliferous beds at sea level. Above the low cliff, the steep slope is formed by the Udairn Shale Member and above this, the high cliff is formed by the Holm Sandstone and Rigg Sandstone members. (Photo: N. Morton.)

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Figure 6.43
Sowerby’s (1829) original illustration of ‘Ammonites murchisonae ’. Natural size.

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Figure 6.44
Schematic graphic log of the Bearreraig Sandstone Formation at Bearreraig Bay, showing lithostratigraphical and chronostratigraphical subdivisions. More detailed bed-by-bed descriptions and measured successions can be found in Morton and Hudson (1995).

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Figure 6.45
The Aalenian–Bajocian stage boundary section beside the pipeline at Bearreraig Bay. The boundary is taken at the base of the slightly harder bed (arrowed) which is Bed U10 of Figure 6.46. (Photo: M.G. Sumbler.)

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Figure 6.46
Details of the succession across the Aalenian–Bajocian boundary at the Auxiliary Stratotype Point at Bearreraig Bay (outcrop near bottom of pipeline cutting (NG 5170 5271). (After Morton and Hudson, 1995, fig. 28.) ([M] = macroconch; [m] = microconch.) Bed numbers follow Morton and Hudson (1995).

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Figure 6.47
Geological map of the northern part of Beinn na Leac, Rudha na Leac and Hallaig, Isle of Raasay (Quaternary sediments and minor intrusions omitted). (After Morton and Hudson, 1995, fig. 9.)

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Figure 6.48
Gualann an Leac (northern face of Beinn na Leac). The grassy slopes in the lower left are the Dun Caan Shale Member above which, left of centre, are the steeper slopes, with ledges sloping down to right, formed by the Beinn na Leac Sandstone Member. The upper part of this member forms the lower third of the lower cliff, while the upper part of the lower cliff and the high cliffs behind are composed of the Raasay Sandstone Member. (Photo: N. Morton.)

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Figure 6.49
Succession from the top of the Scalpa Sandstone Formation (Lower Jurassic, Upper Pliensbachian) to the lower part of the Bearreraig Sandstone Formation (uppermost Toarcian, Aalenian and Lower Bajocian) at Gualann na Leac. (After Morton and Hudson, 1995, fig. 14.)

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