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Volume 21: British Upper Jurassic Stratigraphy — Chapter 02
 

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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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Figure 2.1
Map of southern England showing the outcrop of the Oxfordian–Kimmeridgian beds, and the principal structural and palaeogeographical features (based on Scotchman, 1991a, fig. 1; Bristow et al., 1995, fig. 6 and Newell, 2000, fig. 6).

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Figure 2.2
Correlation of Oxfordian strata in Dorset, Wiltshire and Oxfordshire.

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Figure 2.3
Cross-section of north Dorset, showing the effect of syndepositional faulting on the thicknesses of the Corallian beds (after Bristow et al., 1995, fig. 38).

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Figure 2.4
Locations of Oxfordian and Kimmeridgian GCR sites in southern England.

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Figure 2.5
Sketch map of the solid geology of the Furzy Cliff–Ringstead Bay area (based on Cox and Gallois, 1981, fig. 5 and BGS Sheet 341/342 (West Fleet and Weymouth) 1976).

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Figure 2.6
The complete stratal succession at the Osmington GCR site.

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Figure 2.7
The ammonite zones and subzones of the Oxfordian Stage showing the zonal range of the strata present at the Osmington GCR site.

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Figure 2.8
Log of the Corallian Group at Osmington, (after Sun, 1989, figs 6, 7, 10 and 13).

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Figure 2.9
View of the Corallian limestones in the cliffs west of Bran Point. Alternations of marl and concretionary limestone in the base of the cliff and rock platform (Upton Member, A) are overlain by Shortlake Member oolite (B), with Nodular Rubble (C) and Clavellata Formation (D) in the cliff behind. (Photo: J.K. Wright.)

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Figure 2.10
Sequence stratigraphical interpretation of the Corallian sequence at the Osmington GCR site (after Newell, 2000, fig. 2).

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Figure 2.11
Selection of Oxfordian ammonites from the Dorset coast Oxfordian exposures. (A) Ringsteadia evoluta Salfeld, Osmington Mills Ironstone, Black Head, J44969, ×0.95. (B) Amoeboceras glosense (Bigot and Brasil), Clavellata Member, Black Head, D/C/25, ×0.95. (C) Perisphinctes (Perisphinctes) uptonensis Arkell, Clavellata Member, Black Head, DC42, ×0.80. (D) P. (Pseudarisphinctes) pachachii Arkell, Clavellata Member, Black Head, D/C/46, ×0.48. (E) Amoeboceras ilovaiskii (M. Sokolov), Clavellata Member, Black Head, D/C/29, ×1. (F) Cardioceras (Subvertebriceras) zenaidae Ilovaiski, Preston Grit, Redcliff, D/C/90, ×1. (G, H) Cardioceras (Vertebriceras) quadrarium S. Buckman. Red Nodule Bed, Furzy Cliff, D/O/35, ×1. (I) Cardioceras (Cardioceras) costicardia S. Buckman, Red Nodule Bed, Furzy Cliff, D/O/20, ×1. (J) Perisphinctes (Dichotomosphinctes) sp. Weymouth Member, Bowleaze Clay, Furzy Cliff, D/O/41, ×0.58. (K) Cardioceras (Scarburgiceras) praecordatum Douvillé, East Fleet section, just north-west of the Lynch Cove GCR site, D/O/1, ×1. (Photos: (A, C, D) K. D’Souza; (F), K. Denyer; (B, E, G–K), J.K. Wright. Collections: Prefix ‘D’, J.K. Wright collection; prefix ‘J’, Sedgwick Museum Collection, Cambridge.)

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Figure 2.12
Kimmeridge Clay outcrops in the Dorset type area (after Cox and Gallois, 1981, fig. 1).

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Figure 2.13
Graphic section of the lower part of the Kimmeridge Clay at Osmington Mills (SY 7342 8174). (After Cox and Gallois, 1981, pp. 33–4.)

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Figure 2.14
Correlation between the main sections of Kimmeridge Clay on the Dorset coast. Youngest zones not shown. (After Cox and Gallois, 1981, fig. 5.)

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Figure 2.15
Graphic section of the Eudoxus–Pectinatus zonal interval at Ringstead Bay (SY 7619 8147, SY 7606 8147 and SY 765 813). (After Cox and Gallois, 1981, p. 35.)

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Figure 2.16
Sketch map of the solid geology in the vicinity of the Sandsfoot GCR site.

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Figure 2.17
The complete stratal succession at the Sandsfoot GCR site.

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Figure 2.18
Weathering profile of the Redcliff Formation between Nothe and Rodwell (after Wright, 1986a, figs 2 and 3).

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Figure 2.19
Preston Grit exposed in the rock platform just east of Nothe Fort. (Photo: J.K. Wright.)

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Figure 2.20
Weathering profile of the Sandsfoot Grit in the cliff section beneath Sandsfoot Castle (after Wright, 1986a, fig. 5).

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Figure 2.21
Massive Sandsfoot Grit of Unit III below Sandsfoot Castle, showing the intense Thalassinoides bioturbation of the harder bands weathering out in the foreground blocks. (Photo: J.K. Wright.)

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Figure 2.22
Geological map for the Small Mouth, East Fleet and Lynch Cove GCR sites.

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Figure 2.23
Correlation of the basal beds of the Kimmeridge Clay exposed at Wyke Regis, Sandsfoot, Black Head, Osmington Mills and Ringstead Bay (based on Cox and Gallois, 1981, fig. 6 and unpublished borehole data, R.W. Gallois, pers. comm.).

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Figure 2.24
Log of the Corallian succession at East Fleet, after Wright (1986a, fig. 4). Note that Bed 7 is only 0.9 m thick – the thickness of 3.5 m given in Wright (1986a) is a misprint.

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Figure 2.25
Sketch map of the solid geology of the Kimmeridge area, (based on Cox and Gallois, 1981, fig. 7 and Gallois, 2000, fig. 1).

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Figure 2.26
Geological sketch sections of the Kimmeridge Clay exposed in the cliffs between Brandy Bay and Chapman’s Pool (based on Cox and Gallois, 1981, fig. 8 and Gallois, 2000, fig. 2).

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Figure 2.27
Generalized vertical section through the upper part of the Kimmeridge Clay exposed in the cliffs east of Clavell’s Hard (based on Cox and Gallois, 1981, fig. 13 and Gallois, 2000, figs 4 and 6).

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Figure 2.28
Looking east from Clavell’s Hard to Rope Lake Head and St Alban’s Head (far distance). The lower part of the cliff face comprises alternating mudstones and ribs of oil shale including the Blackstone, Rope Lake Head Stone Band and Short Joint Coal. The upper part comprises a thick succession of pale calcareous mudstones including, towards the top, the Basalt Stone Band. The cliff is capped by further alternations of mudstone and oil shale including the White Stone Band. (Photo: W.A. Read.)

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Figure 2.29
Exposure of Abbotsbury Ironstone at Blind Lane, Abbotsbury. (Photo: A6478, reproduced with kind permission of the Director, British Geological Survey ©NERC.)

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Figure 2.30
Locality map for sites around Westbury. Geological information from BGS Sheet 281 (Frome) (1965).

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Figure 2.31
Locality map for the Steeple Ashton GCR site. Geological information from BGS Sheet 281 (Frome) (1965).

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Figure 2.32
Log of the Corallian succession at Steeple Ashton (after Negus and Beauvais, 1979, fig. 1).

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Figure 2.33
Locality map for the Seend Cleeve GCR site. Outcrop of the Corallian sandstones from BGS Sheet 281 (Frome) (1965).

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Figure 2.34
Weathering profile of the Corallian succession at Seend Cleeve Quarry as seen by J.K. Wright in 1978.

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Figure 2.35
Sketch map of the cutting on the former Midland and South Western Junction Railway. The line is now dismantled. The section south-west of Westlecot Road bridge constitutes the Kimmeridgian GCR site. (Geology based on Arkell, 1948, fig. 1 and British Geological Survey Sheet SU 18 SE.)

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Figure 2.36
The type specimen of Pectinatites (P.) eastlecottensis (Salfeld) as figured by Salfeld (1913) but enlarged to natural size.

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Figure 2.37
Locality map for the Shellingford Crossroads GCR site. Outcrop of the Stanford Formation (mapped as ‘Corallian limestone g11b’) from BGS Sheet 253 (Abingdon) (1971).

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Figure 2.38
Log of the Corallian succession at Shellingford Crossroads Quarry (after Goldring et al., 1998b, fig. 3).

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Figure 2.39
Locality map for the Lamb and Flag Inn Quarry. Corallian outcrops from Arkell (1939a, plate 30).

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Figure 2.40
Weathering profile of the Lamb and Flag Inn Quarry as seen by J.K. Wright in 1983.

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Figure 2.41
Correlation of sections at Shellingford Crossroads Quarry, Lamb and Flag Quarry, and Dry Sandford Quarry (after Johnson, 1983, fig. 2).

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Figure 2.42
Locality map for Dry Sandford Quarry. Outcrop of Stanford Formation from BGS Sheets 253 (Abingdon) (1971) and 236 (Witney) (1982).

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Figure 2.43
Log of the Corallian succession at Dry Sandford Quarry (after Johnson, 1983, fig. 1B).

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Figure 2.44
View of the main north–south face at Dry Sandford Quarry, showing the Lower Trigonia Bed (Bed 6) and Upper Trigonia Bed (Bed 8) separated by shelly sand (Bed 7) marked by the hammer (shaft length, 30 cm). (Photo: J.K. Wright.)

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Figure 2.45
Locality map for the Cumnor GCR site. Outcrop of Wheatley Limestone and Coral Rag from BGS Sheet 236 (Witney) (1982).

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Figure 2.46
View of the Cumnor site in 1998, showing the 1.2 m high face in flaggy-weathering Wheatley Limestone. (Photo: J.K. Wright.)

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Figure 2.47
Locality map for Cross Roads Quarry and Magdalen Quarry. Outcrop of the Corallian limestones from BGS Sheet 237 (Thame) (1994).

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Figure 2.48
View of the central face at Cross Roads (Rock Edge) Quarry, showing the regular bedding in coralliferous calcarenite of the Wheatley Limestone. The coral clasts rarely exceed 10 mm in diameter. Hammer shaft is 30 cm long. (Photo: J.K. Wright.)

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Figure 2.49
Figure 2.49 Correlation of sections in Magdalen Quarry, Cross Roads Quarry and Windmill Quarry (after Arkell, 1927, fig. 11), showing the transition from Coral Rag reef facies on the right into Wheatley Limestone facies on the left.

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Figure 2.50
View of the main east–west face at Magdalen Quarry showing the irregularly bedded Wheatley Limestone. The ‘First Headington Hard’ (Bed 5, 0.35 m) is just below the level of the mapcase (36 cm long). (Photo: J.K. Wright.)

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Figure 2.51
The type specimen of Pectinatites (Virgatosphinctoides) wheatleyensis (Neaverson) as figured by Neaverson (1925, pl.1, fig. 1). Natural size.

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Figure 2.52
Graphic sections showing the Kimmeridgian stratigraphy at the Littleworth Brick Pit and other sections in Oxfordshire and Buckinghamshire, after Horton et al. (1995, fig. 17). AmC, Ampthill Clay; CB, Crussoliceras Band; ES, Elmhurst Silt; HBS, Holman’s Bridge Shale; HwS, Hartwell Silt; KC, Kimmeridge Clay; LGS, Lower Greensand; LLB, Lower Lydite Bed; Pl, Portland Formation; PS, Pectinatus Sand; SwC, Swindon Clay; TS, Thame Sand; ULB, Upper Lydite Bed; WC, Watermead Clay; WNB, Wheatley Nodule Bed; WS, Wheatley Sand; VL, Virgula Limestone.

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