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Volume 30: British Lower Jurassic Stratigraphy — Chapter 04
 

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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 4.1
Generalized geology of the Severn Basin and western edge of the East Midlands Shelf. Only the main basin-bounding faults are indicated. Numbers correspond to the locations of the GCR sites: 18 – Hock Cliff; 19 – Blockley Station Quarry; 20 – Robin’s Wood Hill Quarry; 21 – Alderton Hill Quarry; 22 – Wotton Hill; 23 – Coaley Wood; 24 – Haresfield Hill; 25 – Newnham (Wilmcote) Quarry (Chapter 5); MB – Mickleton Borehole; SPB – Stowell Park Borehole.

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Figure 4.2
Lithostratigraphical subdivisions and stratigraphical ranges of GCR sites for the Lias Group of the Severn Basin.

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Figure 4.3
Geology and location map for the Hock Cliff GCR site.

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Figure 4.4
Simplified graphic log of the succession exposed at Hock Cliff, Fretherne.

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Figure 4.5
Alternating mudstones and limestones of the Bucklandi Zone near the top of the Blue Lias Formation at Hock Cliff, looking eastwards. Bed 2 is exposed at river level on the lower right; the three conspicuous limestone bands in the lower half of the main cliff face are beds 16, 18 and 20, with Bed 22 being the fainter band about 2 m higher. (Photo: M.J. Simms.)

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Figure 4.6
Intact test (32 mm across) of the echinoid Miocidaris lobatum, from the lower part of the Bucklandi Subzone at Hock Cliff. Isolated plates and spines of this species are one of the most common elements of the exceptionally rich and diverse echinoderm fauna at this site. (Photo: M.J. Simms.)

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Figure 4.7
Geology and location map for the Blockley Station Quarry GCR site.

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Figure 4.8
The exceptionally thick development of Luridum Subzone clays at Blockley Station Quarry. The floor of the pit is at about the level of the top of the Crinoid–Belemnite Bed (Bed Z); the projecting, and slightly undercut, band above the second terrace is formed by beds 2–4; the remainder of the succession comprises beds 5 and 6. (Photo: C.J. Underwood.)

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Figure 4.9
Sketch section of the succession at Blockley Station Quarry and correlation with that on the Dorset coast. Roman numerals refer to ammonite faunas described by Callomon and discussed in the text. Based on Callomon (in Hemingway et al., 1969) and unpublished observations by C.J. Underwood.

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Figure 4.10
Geology and location map for the Robin’s Wood Hill Quarry GCR site.

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Figure 4.11
View of the upper part of Robin’s Wood Hill Quarry. The conspicuous pale band near the top of the lower face is Bed 22; beds 28–30 are visible as a pale band about halfway up the face of the upper quarry; with Bed 35 at the top of the section. (Photo: M.J. Simms.)

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Figure 4.12
Simplified graphic log of the Pliensbachian succession exposed at Robin’s Wood Hill Quarry. After Chidlaw (1987).

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Figure 4.13
Geology and location map for the Alderton Hill Quarry GCR site.

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Figure 4.14
Large specimen (70 mm across) of the early teleost Leptolepis coryphaenoides, from the Fish Bed of the Dumbleton Member at Dumbleton Pit, just to the east of Alderton Hill Quarry. Specimen from the Simms Collection, in Bristol City Museum. (Photo: M.J. Simms.)

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Figure 4.15
Incomplete wing (30 mm long) of the dragonfly Heterophlebia buckmani, from the Fish Bed of the Dumbleton Member at Alderton Hill Quarry. Specimen from the Simms Collection, in Bristol City Museum. (Photo: M.J. Simms.)

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Figure 4.16
Outcrop/subcrop map of Toarcian strata in the Severn Basin, showing the geographical distribution of sand-dominated (Bridport Sand Formation > Whitby Mudstone Formation) and clay-dominated successions. The location of the three Cotswold Cephalopod Bed Member GCR sites is indicated: W– Wotton Hill; C– Coaley Wood; H– Haresfield Hill. After Green (1992).

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Figure 4.17
Lithostratigraphical and biostratigraphical correlation of named units within the Cotswold Cephalopod Bed Member (Bridport Sand Formation) at the GCR sites of Wotton Hill (from new observations by Chidlaw), Coaley Wood (after Richardson, 1910b) and Haresfield Hill (after Buckman, 1887–1907; and Richardson, 1904). Ammonite zonal stratigraphy revised by K.N. Page.

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Figure 4.18
General geology and location map for the Wotton Hill GCR site and the Nibley Knoll exposure.

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Figure 4.19
Upper part of the Bridport Sand Formation exposed in the lower quarry at Wotton Hill. Typical Bridport Sand Formation forms the lower, pale part of the central buttress and is overlain by the Cotswold Cephalopod Bed Member, with the Struckmanni Bed forming the conspicuous bipartite unit in its lower part. The Middle Jurassic Birdlip Limestone Formation above is clearly visible towards the top of the quarry in the background; its junction with the Cotswold Cephalopod Bed Member below lies at the level of the conspicuous undercut. (Photo: M.J. Simms.)

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Figure 4.20
Geology and location map for the Coaley Wood GCR site.

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Figure 4.21
Geology and location map for the Haresfield Hill GCR site.

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Figure 4.22
The Lower–Middle Jurassic boundary at Haresfield Hill. The prominent overhanging units are part of the Birdlip Limestone Formation, of Middle Jurassic age. The very thin development of the Cotswold Cephalopod Bed Member lies beneath the lower overhang and overlies an irregular erosion surface on the paler coloured sands of the Bridport Sand Formation. (Photo: K. Hitchings.)

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