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Volume 30: British Lower Jurassic Stratigraphy — Chapter 06
 

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Chap 01
19 figures
2 tables
Chap 02
32 figures
1 table
Chap 03
23 figures
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Chap 04
22 figures
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Chap 05
16 figures
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Chap 06
25 figures
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Chap 07
1 figure
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Chap 08
21 figures
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Figure 6.1
Sketch map and structure of the Cleveland Basin. After Rawson and Wright (1992).

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Figure 6.2
Lithostratigraphical subdivisions and stratigraphical ranges of GCR sites for the Lias Group of the Cleveland Basin.

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Figure 6.3
Sketch map of Redcar Rocks and Coatham Rocks, showing the location of the named scars and significant ammonite faunas.

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Figure 6.4
Redcar foreshore after storms have washed away the beach sand, exposing mudrocks of the Redcar Mudstone Formation, Calcareous Shale Member. This area exposes part of the ‘Upper Bucklandi Beds’ of Tate and Blake (1876), of Scipionianum Subzone to Sauzeanum Subzone age. (Photo: K.N. Page.)

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Figure 6.5
Extensive foreshore exposures of the Redcar Mudstone Formation in Robin Hood’s Bay at low tide, viewed from Ravenscar. The concentric disposition of the ‘reefs’ demonstrates the domed structure of the outcrop here. (Photo: M.J. Simms.)

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Figure 6.6
Outcrop map of Lower Jurassic strata on the foreshore around Robin Hood’s Bay. After Rawson and Wright (1992).

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Figure 6.7
a The stratigraphy of the Sinemurian and Lower Pliensbachian succession in Robin Hood’s Bay. Lithostratigraphy after Hesselbo and Jenkyns (1995).

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Figure 6.7
b The stratigraphy of the Lower Pliensbachian succession in Robin Hood’s Bay. Lithostratigraphy after Hesselbo and Jenkyns (1995).

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Figure 6.8
Cliff and foreshore exposures of the Redcar Mudstone Formation in the southern part of Robin Hood’s Bay. The level foreshore in the foreground exposes mudstones of Simpsoni Subzone age and the base of the Oxynotum Subzone is immediately above the conspicuous bipartite bed in the middle distance (the ‘Double Band’ of Tate and Blake, 1876; Bed 43 of Hesselbo and Jenkyns, 1995). The cycles visible in the lower part of the cliff behind are in the upper part of the Siliceous Shale Member, of Raricostatum Zone age. They are overlain by darker and more homogenous mudstones of the Pyritous Shale and Ironstone Shale members, of Jamesoni Zone age, which are exposed in the upper part of the buttress towards the left of the picture. (Photo: K.N. Page.)

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Figure 6.9
Outcrop map of the main lithostratigraphical units exposed on the foreshore between Robin Hood’s Bay and Hawsker Bottoms. After Knox et al. (1990).

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Figure 6.10
The stratigraphy of the Pliensbachian and Toarcian succession between Castle Chamber and Hawsker Bottoms. After Hesselbo and Jenkyns (1995).

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Figure 6.11
Lateral variation in the Cleveland Ironstone Formation along NW–SE transects between Eston and Hawsker. Datum for the Kettleness Member is the Sulphur Band; datum for the Penny Nab Member is the base of the Two Foot Seam. Roman numerals indicate the cycles of Howard (1985). After Young et al. (1990a).

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Figure 6.12
a The Lower Toarcian succession exposed at Blea Wyke. Based on Hesselbo and Jenkyns (1995) and Howarth (1962a).

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Figure 6.12
b The Lower and Upper Toarcian succession exposed at Blea Wyke. Based on Hesselbo and Jenkyns (1995) and Howarth (1962a).

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Figure 6.13
Concretions of the Peak Stones at least 1.5 m in diameter (Bed xi of Howarth, 1962a) in the Bituminous Shales of the Mulgrave Shale Member (Falciferum Subzone), on the shore below Ravenscar Hotel. (Photo: K.N. Page.)

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Figure 6.14
Outcrop map of the main lithostratigraphical units between Staithes and Port Mulgrave. After Rawson and Wright (1992).

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Figure 6.15
a Section through the Staithes Sandstone and Cleveland Ironstone formations between Cowbar Nab, Staithes, and Rosedale Wyke, Port Mulgrave. After Rawson and Wright (1995). Bed numbers are those of Howarth (1955, 1962a, 1973). The Cleveland Ironstone Formation cycles of Howard (1985) are indicated.

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Figure 6.15
b Section through the top of the Cleveland Ironstone and the Whitby Mudstone formations between Cowbar Nab, Staithes, and Rosedale Wyke, at Port Mulgrave. After Rawson and Wright (1995). Bed numbers are those of Howarth (1955, 1962a, 1973).

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Figure 6.16
Foreshore and cliff exposures of the Staithes Sandstone Formation, of Stokesi Subzone age, on the west side of Penny Nab, Staithes. Sandstones and sandy mudstones form the steep lower portion of the cliff (mostly in shade) and are overlain by mudstones, siltstones and ironstones of the Cleveland Ironstone Formation, Penny Nab Member (mainly Subnodosus–Margaritatus subzones) in the less steep (and well-lit) upper part of the cliff. (Photo: K.N. Page.)

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Figure 6.17
Silty mudstones and ironstone bands in the Cleveland Ironstone Formation at Penny Nab, south of Staithes. The Two Foot Seam, the six thin ironstones of the Pecten Seam, and the various beds of the Main Seam above can easily be recognized. The higher part of the cliff face is in the Whitby Mudstone Formation. (Photo: M.J. Simms.)

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Figure 6.18
The long-abandoned alum shale workings on Boulby Cliff, with the Middle Jurassic sandstones of the Dogger Formation rising behind them. (Photo: K.N. Page.)

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Figure 6.19
Sketch section of Boulby Cliff. After Hunton (1836). Bed numbers are those of Howarth (1955) for the Staithes section. Hunton’s original lithological notes are on the right-hand side of the column; the modern interpretation of the lithostratigraphy is on the left.

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Figure 6.20
The Pliensbachian succession on the lower face of Boulby Cliff, viewed from the abandoned alum workings. The ironstone bands of the Cleveland Ironstone Formation are visible in the upper part of the face. Foreshore reefs are formed by the upper beds of the Redcar Mudstone Formation, Ironstone Shale Member. (Photo: K.N. Page.)

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Figure 6.21
Outcrop map of the Whitby Mudstone Formation on the foreshore between Whitby and Saltwick. After Howarth (1962a).

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Figure 6.22
The Whitby Mudstone Formation in the cliffs at its type location. (Photo: K.N. Page.)

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