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Volume 26: British Middle Jurassic Stratigraphy — Chapter 02
 

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Figure 2.1
Geological sketch map showing the location of the GCR sites described in Chapter 2. (1) Shipmoor Point–Butterstreet Cove; (2) Tidmoor Point–East Fleet Coast; (3) Crookhill Brickpit; (4) Ham Cliff, Redcliff Point; (5) Burton Cliff and Cliff Hill Road Section; (6) Watton Cliff; (7) Peashill Quarry; (8) Horn Park Quarry; (9) Conegar Hill; (10) Ryewater, Corscombe; (11) Seavington St Mary Quarry; (12) Troll Quarry; (13) Bradford Abbas Railway Cutting; (14) Louse Hill Quarry; (15) Halfway House Cutting and Quarry; (16) Sandford Lane Quarry; (17) Frogden Quarry; (18) Goathill; (19) Holway Hill Quarry; (20) Milborne Wick Section; (21) Laycock Railway Cutting; (22) Shepton Montague; (23) Godminster Lane Quarry and Railway Cutting; (24) Bruton Railway Cutting; (25) Doulting Railway Cutting; (26) Vallis Vale; (27) Hinton Hill, Wellow; (28) Hinton Charterhouse; (29) Gripwood Quarry.

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Figure 2.2
Simplified diagrammatic cross-section through the Bathonian strata of Wessex. (After Bristow et al., 1995, fig. 23.)

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Figure 2.3
Simplified stratal subdivision of the Aalenian–Bajocian succession of the Wessex region. Vertical ruled lines indicate major non-sequences. Not to scale. (Based on data in Bristow et al., 1995, 1999; Callomon and Cope, 1995; and Parsons, 1980a.)

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Figure 2.4
Lithostratigraphical classification of the Great Oolite Group in the Wessex region. Vertical ruled lines indicate non-sequence. (Based on data in Penn and Wyatt, 1979; Torrens, 1980b; Page, 1989, 1996a; Bristow et al., 1995, 1999; and Wyatt, 1998.) (-E-E-E-E- = Echinata Bed; -A-A-A-A- = Acuminata Bed of Penn and Wyatt (1979); HS = Hinton Sand Member; LSL = Lower Smithi Limestone; RB = Rugitela Beds; TI = Twinhoe Ironshot; UFE = Upper Fuller’s Earth Member; USL = Upper Smithi Limestone.)

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Figure 2.5
Sketch map showing the position of the seven localities that comprise the Shipmoor Point– Butterstreet Cove and Tidmoor Point–East Fleet Coast GCR sites. (1) Shipmoor Point; (2) Berry Knap; (3) Rodden Hive Point; (4) Langton Hive Point; (5) Herbury; (6) Langton Herring Quarry; (7) Butterstreet Cove–Tidmoor Point.

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Figure 2.6
Stratal subdivisions and thicknesses at the localities within the Shipmoor Point–Butterstreet Cove and Tidmoor Point–East Fleet Coast GCR sites.

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Figure 2.7
(A) Digonella digona (J. Sowerby); (B) Goniorhynchia boueti (Davidson); (C) Praeexogyra hebridica (Forbes) var. elongata (Dutertre). (Reproduced from Damon, 1860, fig. 4; and Arkell, 1947a, fig. 3.) All specimens are natural size.

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Figure 2.8
General view of the Crookhill Brickpit GCR site. (Photo: K.L. Duff.)

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Figure 2.9
General view of Ham Cliff from Redcliff Point. The Callovian–Oxfordian stage boundary lies in the grey clays of the Oxford Clay Formation on the right of the picture. The steep cliff is in the lower part of the Corallian Group. (Photo: K.N. Page.)

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Figure 2.10
Graphic section of the Callovian–Oxfordian stage boundary beds at Ham Cliff. (After Callomon and Cope, 1995, fig. 21.) For lithologies, see text.

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Figure 2.11
East end of Burton Cliff showing the Bridport Sand Formation capped by the Inferior Oolite Formation. (Photo: A5849, British Geological Survey, 1932.)

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Figure 2.12
Section of Inferior Oolite Formation capping Bridport Sand Formation in the cutting on Cliff Road, Burton Bradstock. (Photo: A5851, British Geological Survey, 1932.)

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Figure 2.13
Graphic section of the Inferior Oolite Formation at Burton Cliff, Burton Bradstock. (After Callomon and Cope, 1995, fig. 9.) For lithologies, see text.

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Figure 2.14
Fallen block of the Snuff-box Bed showing cross-sections of the characteristic limonitic oncoids known as ‘snuff-boxes’. (Photo: A5845, British Geological Survey, 1932.)

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Figure 2.15
Watton Cliff. The Boueti Bed at the base of the Forest Marble Formation cuts the cliff near the sharp bend in the cliff profile on the left (arrowed). Below lies the Frome Clay Formation. (Photo: A5838, British Geological Survey, 1932.)

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Figure 2.16
Diagrammatic cross-section of the cliffs between Eype Mouth and the River Brit (Bridport Harbour), including the Watton Cliff GCR site. (After Macfadyen, 1970, fig. 18.)

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Figure 2.17
Bryozoa from Peashill Quarry as illustrated by Walford (1889, pl. XIX). According to Walter (1967), figures 1–9 are Idmonea triquetra Lamouroux, figure 10 is Stomatopora spatiosa (Walford) and figures 11–12 are Mecynoecia bajociana (d’Orbigny). Magnifications, ranging from ×8 to ×20, are shown beside each figure.

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Figure 2.18
Graphic section of the Inferior Oolite Formation at Horn Park Quarry. (After Callomon and Cope, 1995, fig. 10.) For lithologies, see text.

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Figure 2.19
Surface of the Horn Park Ironshot Bed (Bed 5a) with the graphoceratid ammonite Brasilia. The ruler at the bottom right is 15 cm long. (Photo: R.B. Chandler.)

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Figure 2.20
Graphic section of the succession at the Conegar Hill GCR site. (After Richardson, 1928–30, fig. 7.) For lithologies, see text.

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Figure 2.21
Sketch map of the Ryewater GCR site. (After Cope and Cox, 1970, fig. 2.) According to Page (1988), the Cornbrash Formation also crops out in the stream just north of Rye Water Lane.

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Figure 2.22
Type specimen of Proplanulites koenigi (J. Sowerby), chorotypes of which occur at the Ryewater GCR site; The Natural History Museum, London, specimen No. 43891C). The specimen is shown at natural size. (Photo: © The Natural History Museum.)

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Figure 2.23
Graphic section of the Inferior Oolite Formation at the Seavington St Mary Quarry GCR site. (After Callomon and Chandler, 1990, fig. 3.) For lithologies, see text.

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Figure 2.24
Tulites subcontractus (Morris and Lycett) from the Fuller’s Earth Rock Member of Troll Quarry as figured by Arkell (1952, text-fig. 30). The specimen is shown at c. 75% natural size.

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Figure 2.25
The main face at Troll Quarry, as exposed in 1964. (Photo: H.S. Torrens.)

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Figure 2.26
Graphic section of the Inferior Oolite Formation at Bradford Abbas Railway Cutting. (After Callomon and Chandler, 1990, fig. 3.) For lithologies, see text.

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Figure 2.27
Geological sketch section of the Bradford Abbas Railway Cutting as illustrated by Woodward (1894) showing the Inferior Oolite Formation in the east faulted against the Bridport Sand Formation which, to the west, is faulted against the Fuller’s Earth Formation.

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Figure 2.28
Graphoceras concavum (J. Sowerby) (Sedgwick Museum, Cambridge, X27846) – eponymous ammonite of the Aalenian Concavum Zone – from Bed 6a of the Bradford Abbas Railway Cutting GCR site as illustrated by Chandler and Sole (1996, pl. 2, figs 1a,b). The specimen is shown at natural size. (Photo: R.B. Chandler.)

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Figure 2.29
Sketch map showing isopachytes (in metres) for the Inferior Oolite Formation in the Wessex Basin and the GCR sites in the Sherborne area. (After Parsons, 1976a, fig. 1; and Barton et al., 1993, fig. 5.)

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Figure 2.30
Graphic section of the Inferior Oolite Formation at Louse Hill Quarry. (After Callomon and Cope, 1995, fig. 11.) For lithologies, see text.

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Figure 2.31
Lectotype of Parkinsonia dorsetensis (Wright) from the Halfway House Cutting and Quarry GCR site based on Buckman (1928, pls DCCLXVIIA and B). Arkell (1956b) described this taxon as the principal species of the Truellei Subzone there. (A = c. 20% natural size; B = c. 80% natural size.)

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Figure 2.32
Graphic section of the Inferior Oolite Formation at the Sandford Lane Quarry GCR site. (After Callomon and Chandler, 1990, fig. 4.) For lithologies, see text.

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Figure 2.33
Shirbuirnia trigonalis S.S. Buckman – eponymous ammonite of the Trigonalis Subzone (Laeviuscula Zone) and one of many fossils whose type specimen comes from Sandford Lane Quarry. (Reduced to c. 50% natural size from Buckman, 1910b, pl. 10, figs 2,3.)

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Figure 2.34
Graphic section of the Inferior Oolite Formation at Frogden Quarry. (After Callomon and Cope, 1995, fig. 12.) For lithologies, see text.

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Figure 2.35
Frogdenites spiniger S.S. Buckman, type species of the genus which takes its name from Frogden Quarry, as illustrated by Buckman (1921, pl. 215). The specimen is shown at natural size.

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Figure 2.36
The quarry at Goathill (the hammer, to the far left, is resting on the Linguifera Bed). (Photo: British Geological Survey, No. A15157; reproduced with the permission of the Director, British Geological Survey, © NERC, 1990.)

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Figure 2.37
(A) Ornithella bathonica (Rollier), lectotype from the Fuller’s Earth Rock Member, near Bath; (B) ‘Terebratulalinguifera Davidson, Fuller’s Earth Rock Member, Haydon, Dorset; (C) Ornithella haydonensis Muir-Wood; holotype from the Fuller’s Earth Rock Member, Haydon, Dorset. (Reproduced respectively from Muir-Wood, 1936, pl. 5, figs 7a–c; pl. 3, figs 12a–c; and pl. 5, figs 1a–c; courtesy of the Palaeontographical Society.) All specimens are shown at natural size.

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Figure 2.38
Homoeorhynchia ringens (von Buch) as illustrated by Davidson (1878). The specimen on which these figures are based in fact came from Halfway House Cutting and Quarry (see GCR site report, this volume). The specimen is shown at natural size.

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Figure 2.39
Graphic section of the Inferior Oolite Formation at the Milborne Wick Section. For lithologies, see text.

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Figure 2.40
Fuller’s Earth Formation exposed on the south side of Laycock Railway Cutting. (Photo: British Geological Survey, No. A15155; reproduced with the permission of the Director, British Geological Survey, © NERC, 1990.)

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Figure 2.41
Specimens of Praeexogyra acuminata (J. Sowerby) from Shepton Montague railway cutting as figured by Arkell (1934, pl. 2, figs 30–4).

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Figure 2.42
Diagrammatic reconstructed cross-section through the Inferior Oolite Formation in part of Wessex in Late Bajocian times, illustrating the syndepositional development and fault-control of the so-called ‘Cole Syncline’. The top of the Crackment Limestone Member is taken as the horizontal datum. (After Bristow et al., 1995, fig. 21.)

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Figure 2.43
Exposure of the Fuller’s Earth Rock Member behind the westbound platform at Bruton Railway Station in Bruton Railway Cutting. Marls and muddy limestones of the Rugitela Beds overlie limestones and marls of the Ornithella Beds; the hammer-head marks the boundary. (Photo: British Geological Survey, No. A15537; reproduced with the permission of the Director, British Geological Survey, © NERC, 1996.)

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Figure 2.44
Comparison of the zonation of the Middle–Upper Bathonian used herein with that previously used in Britain. (Modified from Page, 1996a.) (1 = Follows Torrens (1980b) emend.; Dietl and Callomon (1988); and Callomon and Cope (1995); Dietl and Callomon (1988) also divided the Orbis Zone into Blanazense and Hannoveranus subzones in the Subboreal Province of Germany; 2 = Follows Mangold (1991); and Mangold and Rioult (1997) but, following Page (1996a), the Procerites quercinus Biohorizon, at the base of the Blazanense Subzone, is elevated to a full Subzone; 3 = Aspidoides Zone of Torrens (1965, 1974, 1980b); 4 = ‘Retrocostatum’ Zone of Torrens (1974).)

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Figure 2.45
Graphic section of the Middle Jurassic succession atDoulting Railway Cutting. For lithologies, see text. Not all non-sequences shown.

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Figure 2.46
(A) Chomatoseris [‘Anabacia ’] porpites (Wm Smith) (reproduced from Milne Edwards and Haime, 1851, pl. 25, figs 3,3a; courtesy of the Palaeontographical Society); (B) Catinula knorri (Voltz) from quarries at Doulting (reproduced from Arkell, 1934, pl. 2, figs 8–12; courtesy of the Cotteswold Naturalists’ Field Club); (C) holotype of Procerites fullonicus (S.S. Buckman) from Combe Hay near Bath (reproduced from Arkell, 1958a, pl. 24, figs 1a,b; courtesy of the Palaeontographical Society). All specimens are shown at c. 90% of natural size.

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Figure 2.47
The unconformity between the Inferior Oolite Formation and the Carboniferous Limestone at Vallis Vale as illustrated by De la Beche (1846).

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Figure 2.48
Diagrammatic cross-section showing the facies relationships in the transition from the carbonate sediments of the Great Oolite Formation to the argillaceous sediments of the Frome Clay Formation south of Bath. (After Penn and Wyatt, 1979, fig. 17.)

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Figure 2.49
Oxycerites orbis (Giebel) from the Twinhoe Ironshot of Wellow (or Twinhoe) Quarry as figured by Arkell (1951b, text-fig. 17), but shown at c. 60% natural size. (Courtesy of the Palaeontographical Society.)

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Figure 2.50
North face of the sand pit at Hinton Charterhouse showing sandstone doggers in the Hinton Sand Member. (Photo: British Geological Survey, No. A9739; reproduced with the permission of the Director, British Geological Survey, © NERC, 1961.)

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Figure 2.51
Woodward’s (1894) sketch of the section at Gripwood Quarry showing an entrance into the underground galleries where the Ancliff Oolite of the Upper Rags Member (Forest Marble Formation) was worked.

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