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Volume 26: British Middle Jurassic Stratigraphy — Chapter 03
 

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Figure 3.1
Geological sketch map showing the location of the GCR sites described in Chapter 3. (1) Barns Batch Spinney; (2) South Main Road Quarry; (3) Brown’s Folly; (4) Corsham Railway Cutting; (5) Kellaways–West Tytherton; (6) Lower Stanton St Quintin Quarry and Stanton St Quintin Motorway Cutting; (7) Hawkesbury Quarry; (8) Nibley Knoll; (9) Veizey’s Quarry; (10) Kemble Cuttings; (11) Woodchester Park Farm; (12) Minchinhampton; (13) Leigh’s Quarry; (14) Fort Quarry; (15) Haresfield Hill; (16) Frith Quarry; (17) Swift’s Hill; (18) Knap House Quarry; (19) Crickley Hill; (20) Leckhampton Hill; (21) Foss Cross; (22) Stony Furlong Railway Cutting; (23) Rolling Bank Quarry; (24) Hampen Railway Cutting; (25) First Cutting West of Notgrove; (26) Harford Cutting; (27) Huntsmans Quarry; (28) Jackdaw Quarry; (29) Snowshill Hill (Hornsleasow Quarry); (30) Cross Hands Quarry; (31) Sharps Hill; (32) Hook Norton; (33) Horsehay Quarry; (34) Ditchley Road Quarry; (35) Stonesfield; (36) Shipton-on-Cherwell Cement Works and Whitehill Farm Quarry.

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Figure 3.2
Diagrammatic cross-section through the Inferior Oolite Group showing the Painswick and Cleeve Hill ‘synclines’, and the intervening ‘Birdlip Anticline’. (After Akell, 1933, fig. 35; see also Barron et al. (1997, fig. 5) which shows a similar section through the ‘synclines’ based on more recent data and with revised lithostratigraphy.)

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Figure 3.3
Lithostratigraphical classification of the Inferior Oolite Group in the Cotswolds as shown in sites in Chapter 3. Columns are deliberately separated one from the other because of complexities of correlation and non-sequence. Vertical ruling indicates non-sequence. (Based on data in Barron et al., 1997; Parsons, 1979, 1980a; and Wyatt in Sumbler, 1996.)

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Figure 3.4
Lithostratigraphical classification of the Great Oolite Group and overlying beds in the Cotswold area. Columns are deliberately separated one from the other because the nomenclature as used in different areas is in need of rationalization. Vertical ruling indicates non-sequence. (Based on data in Cave, 1977; Horton et al., 1987; Page, 1989, 1996a; Sumbler et al., 2000; Wyatt in Sumbler, 1996; and herein.)

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Figure 3.5
Geological sketch map showing the location of the GCR sites (1) Barns Batch Spinney and (2) South Main Road Quarry. The site of (3) the BGS Elton Farm Borehole is also shown. (After Ivimey-Cook, 1978, fig. 1; and Kellaway and Welch, 1993, fig. 45.)

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Figure 3.6
Composite graphic section of the two GCR sites at Dundry Hill. Beds 1–8b are based on Barns Batch Spinney, beds 8c–13 are based on South Main Road Quarry. (After Callomon and Chandler, 1990, fig. 4.) Horizon numbers have been updated following Callomon in Callomon and Cope (1995). The thickness of Bed 10 is somewhat greater than that given by Parsons (1979). (MCG = Maes Knoll Conglomerate.)

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Figure 3.7
Exposure of Great Oolite Formation on the wooded slopes below Brown’s Folly. (Photo: M.G. Sumbler.)

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Figure 3.8
Graphic section of the Bathonian succession at Brown’s Folly.

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Figure 3.9
North side, Corsham Railway Cutting; current-bedded shell-fragmental limestones and shelly ooidal limestone rest on a rubbly bedded patch-reef immediately west of mile post 99. The hammer-head rests on top of the underlying oolite freestone (Bath Oolite Member). (Photo: British Geological Survey, No. A10913; reproduced with the permission of the Director, British Geological Survey, © NERC, 1967.)

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Figure 3.10
Diagrammatic section of the north side of Corsham Railway Cutting. (After Green and Donovan, 1969, fig. 6.)

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Figure 3.11
The Kellaways Sand Member exposed in the banks of the River Avon west of West Tytherton (Kellaways–West Tytherton GCR site). (Photo: B.M. Cox, 1970.)

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Figure 3.12
Lectotype of Sigaloceras calloviense (J. Sowerby); The Natural History Museum, London, specimen No. 43924a; c. 95% natural size. (Photo: © The Natural History Museum.)

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Figure 3.13
Graphic section showing the correlation between the cored Tytherton No. 3 Borehole and the exposures in the banks of the River Avon, west of West Tytherton (Kellaways–West Tytherton GCR site). (After Page, 1988.) Bed numbers follow Page (1988).

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Figure 3.14
Exposure of Cornbrash on the south side of the M4 motorway cutting (part of the Lower Stanton St Quintin Quarry and Stanton St Quintin Motorway Cutting GCR site). (Photo: M.G. Sumbler.)

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Figure 3.15
Graphic section of the Bathonian– Callovian succession from the two locations that comprise the Lower Stanton St Quintin Quarry and Stanton St Quintin Motorway CuttingGCR site.

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Figure 3.16
Exposure at the western end of Hawkesbury Quarry showing the Upper Trigonia Grit Member overlying the Birdlip Limestone Formation. The boundary is marked by a black arrow. The quarry face is approximately 5 m high. (Photo: M.G. Sumbler.)

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Figure 3.17
Upper Trigonia Grit Member overlying Birdlip Limestone Formation at the quarry at Nibley Knoll. The hammer-head marks the bored hardground between the two. (Photo: M.G. Sumbler.)

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Figure 3.18
Exposure at the quarry at Nibley Knoll showing the Clypeus Grit and Upper Trigonia Grit members (c. 1 m) overlying the Birdlip Limestone Formation (c. 4.6 m). (Photo: M.G. Sumbler.)

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Figure 3.19
Veizey’s Quarry: thin-bedded limestones and clay of the Forest Marble Formation overlying shell-detrital oolites (Combe Down Oolite Member, Great Oolite Formation) and the Athelstan Oolite Formation at the base. (Photo: British Geological Survey, No. A10941; reproduced with the permission of the Director, British Geological Survey, © NERC, 1967.)

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Figure 3.20
Diagrammatic section showing the lateral relationships in the ‘Kemble Beds’ (Great Oolite Formation) at Tetbury Branch Railway Cutting, Kemble Cuttings. (After Cave, 1977, fig. 18.) In other parts of the cutting (see description of Tetbury Branch Railway Cutting), the ‘Reef Bed’ facies is developed at the top of the ‘Kemble Beds’.

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Figure 3.21
Exposure of Forest Marble Formation in the Tetbury Branch Railway Cutting, Kemble Cuttings. (Photo: M.G. Sumbler.)

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Figure 3.22
Holotype of Clydoniceras hollandi (S.S. Buckman) from the basal clay of the Forest Marble Formation of Tetbury Road Station Cuttings, Kemble Cuttings. (Reproduced from Arkell, 1951, pl. 1, figs 6a,b.) The specimens are reproduced at c. 97% natural size, courtesy of the Palaeontographical Society.

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Figure 3.23
Dodington Ash Rock Member overlying ‘Minchinhampton Beds’ in the quarry at Woodchester Park Farm. The boundary is marked by a black arrow. (Photo: M.G. Sumbler.)

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Figure 3.24
Graphic section of the Bathonian succession at Woodchester Park Farm.

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Figure 3.25
General view of Gate Quarry, Minchinhampton, looking north. (Photo: M.G. Sumbler.)

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Figure 3.26
Purpuroidea lycettea Hudleston and Wilson. (Reproduced from Morris and Lycett, 1851, pl. 5, figs 1–2.) Approximately natural size.

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Figure 3.27
Salperton Limestone Formation overlying the Birdlip Limestone Formation at Leigh’s Quarry. The boundary is marked by a black arrow. (Photo: M.G. Sumbler.)

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Figure 3.28
Upper Trigonia Grit Member (Salperton Limestone Formation) overlying thin Aston Limestone Formation at Fort Quarry. The formational boundary is marked by a black arrow. (Photo: British Geological Survey, No. A10482; reproduced with the permission of the Director, British Geological Survey, © NERC, 1966.)

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Figure 3.29
Overhang of the Leckhampton Member (Birdlip Limestone Formation) above the Cephalopod Bed (Lias Group) at Haresfield Hill. (Photo: M.G. Sumbler.)

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Figure 3.30
Aston Limestone Formation overlying Birdlip Limestone Formation at Frith Quarry. The boundary is marked by a white arrow. (Photo: M.G. Sumbler.)

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Figure 3.31
Type material of Homoeorhynchia cynomorpha (S.S. Buckman) from Frith Quarry. (Reproduced from Buckman, 1895, pl. 14, figs 2–4.)

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Figure 3.32
Edwin Witchell (1823–1887). (Reproduced courtesy of the Cotteswold Naturalists’ Field Club.)

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Figure 3.33
General view of the exposure of Aston Limestone Formation at Swift’s Hill with a small outcrop of the overlying Upper Trigonia Grit Member at centre top. (Photo: M.G. Sumbler.)

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Figure 3.34
Upper Trigonia Grit Member (Salperton Limestone Formation) overlying Scottsquar Member (Birdlip Limestone Formation) at Knap House Quarry. (Photo: M.G. Sumbler.)

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Figure 3.35
Exposure of the Crickley Member (Birdlip Limestone Formation) at Crickley Hill. (Photo: M.G. Sumbler.)

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Figure 3.36
Graphic section of the strata exposed at Crickley Hill. (After Ager, 1969, fig. B14.) See text for detailed lithological description.

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Figure 3.37
Specimen of the pisoidal packstone known as ‘Pea Grit’. (Photo: M.G. Sumbler.) (90% natural size.)

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Figure 3.38
Birdlip Limestone Formation in the main face of Devil’s Chimney Quarry (at the Leckhampton Hill GCR site) showing the Scottsquar Member (‘Upper Freestone’ and ‘Oolite Marl’) overlying the Cleeve Cloud Member. (Photo: M.G. Sumbler.)

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Figure 3.39
Graphic section of the succession at Leckhampton Hill. (After Ager, 1969, fig. B15; and Sumbler and Barron, 1996.) For details of lithologies, see text.

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Figure 3.40
Solenopora jurassica Brown; BGS specimen No. GSM 119600, reproduced at c. 70% natural size. (Photo: M.G. Sumbler.)

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Figure 3.41
Exposure of the White Limestone Formation in the quarry at Foss Cross. (Photo: M.G. Sumbler.)

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Figure 3.42
Graphic section of the White Limestone Formation in the quarry at Foss Cross.

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Figure 3.43
Exposure of White Limestone Formation (beds 13 (top) to 28 (bottom)) in Stony Furlong Railway Cutting. (Photo: British Geological Survey, No. A5758, 1929.)

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Figure 3.44
Graphic section of the Bathonian succession in Stony Furlong Railway Cutting. Beds 13–21 are as exposed in the extant section described in the text; the remainder is based on Richardson (1911b).

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Figure 3.45
The ‘Chedworth Bun’ – Nucleolites woodwardi Wright. (Reproduced from Wright, 1854, pl. 12, figs 5a–e). Natural size.

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Figure 3.46
Section at Rolling Bank Quarry showing the rubbly Clypeus Grit Member overlying the more massive Upper Trigonia Grit Member, with ‘Phillipsiana Beds’ (Rolling Bank Member) below. The geologist’s hand rests on the boundary between the Upper Trigonia Grit Member and the ‘Phillipsiana Beds’. (Photo: M.G. Sumbler.)

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Figure 3.47
Minor faults and large debris-filled fissures at Rolling Bank Quarry as illustrated by Buckman (1897, fig. 3).

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Figure 3.48
Graphic section of the Bathonian succession at Hampen Railway Cutting. Bed numbers follow Sumbler and Barron (1996) and Barron (1998).

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Figure 3.49
Exposure of the Hampen Formation in Hampen Railway Cutting. (Photo: M.G. Sumbler.)

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Figure 3.50
General view looking west in the First Cutting West of Notgrove, showing the eastward dip of the Clypeus Grit Member. (Photo: M.G. Sumbler.)

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Figure 3.51
Clypeus ploti Salter. Reproduced from Wright, 1859, pls 28,29, at approximately 90% natural size.

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Figure 3.52
Exposure of the Aston Limestone Formation in Harford Cutting. The geologist’s hand rests on the planar top surface of the Notgrove Member. (Photo: M.G. Sumbler.)

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Figure 3.53
Sketch section illustrating the northern face of Harford Cutting. (After Woodward, 1894, fig. 43.) Total length of section c. 550 m; maximum depth c. 15 m. Vertical bars are bridges, now demolished. Recent examination of the cutting indicates that this diagram is not accurately drawn to scale; for example, the width of the graben near the western end of the section is greatly exaggerated. However, it gives a reasonable impression of the section’s complexity.

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Figure 3.54
The Cotswold Slate at Huntsmans Quarry. (Photo: M.G. Sumbler.)

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Figure 3.55
Exposure at Jackdaw Quarry showing ‘White Guiting Limestone’ in the lower face overlain by Scottsquar Member and the Harford Member. The Lower Trigonia Grit Member is just visible at the top of the section in the middle. (Photo: M.G. Sumbler.)

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Figure 3.56
Snowshill Hill (Hornsleasow Quarry). The floor of the quarry here is the level from which the Hornsleasow Clay has been excavated from the Chipping Norton Limestone Formation; the latter forms the bench with Fuller’s Earth Formation above. (Photo: M.G. Sumbler.)

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Figure 3.57
Graphic section of the succession at Snowshill Hill (Hornsleasow Quarry). (After Torrens, 1969d.)

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Figure 3.58
Chipping Norton Limestone Formation overlying Clypeus Grit Member (Salperton Limestone Formation) at Cross Hands Quarry. The hammer-head (arrowed) marks the formational boundary. (Photo: M.G. Sumbler.)

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Figure 3.59
Exposure of Northampton Sand Formation near the entrance of the quarry at Sharps Hill; the steep dip is due to valley-bulging and cambering. (Photo: M.G. Sumbler.) = Figure 3.60 Graphic log of a trench section through the Sharp’s Hill Formation (beds 1–20) and uppermost Chipping Norton Limestone Formation at Sharps Hill. (Based on B. Boneham MS (English Nature files); see Boneham and Forsey, 1992.) Bed numbering follows Richardson (1911a) but this slightly expanded section may include representatives of Walford’s (1906) beds 7 to 10 (see text). Stegosaur remains were found in the lower part of the Sharp’s Hill Formation.

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Figure 3.61
Exposure of the Chipping Norton Limestone Formation at the north end of the railway cutting at Hook Norton. (Photo: British Geological Survey, No. A9829; reproduced with the permission of the Director, British Geological Survey, © NERC, 1960.)

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Figure 3.62
Clypeus Grit Formation resting on clays of the Lias Group at Hook Norton. (Photo: British Geological Survey, No. A9820; reproduced with the permission of the Director, British Geological Survey, © NERC, 1960.)

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Figure 3.63
Horsehay Sand Formation overlain by the Sharp’s Hill Formation and the Taynton Limestone Formation at Horsehay Quarry. The base of the rule (arrowed) rests on top of the Horsehay Sand Formation. (Photo: M.G. Sumbler.)

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Figure 3.64
Graphic section of the succession at Horsehay Quarry.

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Figure 3.65
‘Boxstone’ weathering in the Northampton Sand Formation at Horsehay Quarry. (Photo: M.G. Sumbler.)

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Figure 3.66
Ditchley Road Quarry. The lower part of the quarry is excavated in Chipping Norton Limestone Formation, which is locally the basal unit of the Great Oolite Group. This is overlain by dark-grey clays of the Sharp’s Hill Formation, which are, in turn, succeeded by the buff marls and marly limestone of the Charlbury Formation with the paler Taynton Limestone Formation above. (Photo: British Geological Survey, No. A15217; reproduced with the permission of the Director, British Geological Survey, © NERC, 1991.)

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Figure 3.67
Graphic section of the Bathonian succession at Ditchley Road Quarry.

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Figure 3.68
Sketch map showing the distribution of the Stonesfield Slate. (After Benton and Spencer, 1995, fig. 6.6.)

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Figure 3.69
Typical Stonesfield Slate mine close to the shaft at Home Close Mine beneath Stonesfield village. The area on the right-hand side of the photo has been worked out, and the roof is supported by pillars of waste material. (Photo: M.G. Sumbler.)

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Figure 3.70
Shipton-on-Cherwell Cement Works. The lower face is the Ardley Member (White Limestone Formation), overlain by the Bladon Member (covered by scree), Forest Marble Formation and then remanié Cornbrash Formation. (Photo: M.G. Sumbler.)

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Figure 3.71
Graphic section of the Bathonian succession at Shipton-on-Cherwell Cement Works.

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Figure 3.72
Facies variation in the Forest Marble Formation of Shipton-on-Cherwell Cement Works. (Based on Allen and Kaye, 1973, fig. 3.)

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