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Volume 30: British Lower Jurassic Stratigraphy — Chapter 02
 

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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
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Chap 08
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Figure 2.1
The major structural elements and sub-basins of the Wessex Basin and its margins. Numbers correspond to the locations of the GCR sites: 1 – Pinhay Bay to Fault Corner and East Cliff; 2 – Cliff Hill Road Section; 3 – Blue Anchor–Lilstock Coast; 4 – Hurcott Lane Cutting; 5 – Babylon Hill; 6 – Ham Hill; 7 – Maes Down; 8 – Lavernock to St Mary’s Well Bay; 9 – Pant y Slade to Witches Point; 10 – Viaduct Quarry; 11 – Hobbs Quarry; 12 – Bowldish Quarry; 13 – Kilmersdon Road Quarry; 14 – Huish Colliery Quarry; 15 – Cloford Quarry; 16 – Holwell Quarry; 17 – Leighton Road Cutting. After Lake and Karner (1987).

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Figure 2.2
Lithostratigraphical subdivisions and stratigraphical ranges of GCR sites for the Lias Group of the Dorset coast, in the southern part of the Wessex Basin.

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Figure 2.3
Lithostratigraphical subdivisions and stratigraphical ranges of GCR sites for the Lias Group in the northern part of the Wessex Basin (Central Somerset and Bristol Channel basins) and the Mendip High and Welsh Massif.

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Figure 2.4
Coastal sections of the Lower Jurassic Series between Pinhay Bay and East Cliff. Based on House (1989) and Hesselbo and Jenkyns (1995).

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Figure 2.5
Looking eastwards along Church Cliffs to Black Ven. The classic limestone–mudstone alternations of the Blue Lias Formation are exposed in Church Cliffs, with the various members of the Charmouth Mudstone Formation exposed in the extensively slipped cliffs of Black Ven behind. The pale mudstones of the Belemnite Marl Member are clearly visible across the middle of Black Ven. (Photo: M.J. Simms.)

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Figure 2.6
a Section through the Penarth Group, Blue Lias Formation, Shales-with-Beef Member and basal Black Ven Marl Member west of Charmouth. After Hesselbo and Jenkyns (1995); with ammonite zones, subzones and biohorizons after Page (1992); and bed numbers after Lang (1924), Lang et al. (1923) and Lang and Spath (1926) . See Figure 2.6b for a key to the lithologies. 

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Figure 2.6
b Key to lithologies.

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Figure 2.7
Diagenetic concretion in the Shales-with-Beef Member containing a topotype specimen of the ammonite subzonal index fossil Microderoceras birchi (M.J. Simms collection, 1981). (Photo: M.J. Simms.)

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Figure 2.8
Section through the Black Ven Marl, Stonebarrow Pyritic and Belemnite Marl members of the Charmouth Mudstone Formation on Black Ven and Stonebarrow. After Hesselbo and Jenkyns (1995); with ammonite zones, subzones and biohorizons after Page (1992); and bed numbers after Lang and Spath (1926) and Lang et al. (1928).

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Figure 2.9
The pseudoplanktonic crinoid Pentacrinites fossilis, originally described from the Stellare Subzone of the Dorset coast. Specimen collected by M.J. Simms (1982); now in the Natural History Museum, London (BMNH E69605). (Photo: M.J. Simms.)

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Figure 2.10
Conspicuously striped mudstones and marls of the Belemnite Marl Member, overlying dark mudstones of the Stonebarrow Pyritic Member (largely obscured by talus) at the eastern end of Stonebarrow, Charmouth. (Photo: M.J. Simms.)

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Figure 2.11
Section from the (Lower Pliensbachian) Green Ammonite Mudstone Member to the (Toarcian) Down Cliff Clay Member of the Dorset coast. After Hesselbo and Jenkyns (1995); with ammonite zonules after Phelps (1985); and bed numbers after Lang (1936) and Howarth (1957).

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Figure 2.12
The sheer cliff face of the Eype Clay Member below Golden Cap, part of the spectacularly thick development of the Stokesi Subzone in Dorset. Thorncombe Beacon and East Cliff are visible in the distance. (Photo: M.J. Simms.)

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Figure 2.13
The Bridport Sand Formation at East Cliff, west of Burton Bradstock. (Photo: M.J. Simms.)

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Figure 2.14
Geological map of the Burton Bradstock area showing the location of the Cliff Hill Road Section. After House (1989).

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Figure 2.15
The section through the Lower–Middle Jurassic boundary exposed at the northern end of Cliff Hill Road Section, Burton Bradstock. After Hesselbo and Jenkyns (1995); with bed numbers for the Inferior Oolite Group from Callomon and Cope (1995).

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Figure 2.16
The eastern side of Cliff Hill Road, looking north. The continous hard band just below the vegetation is Bed 37. (Photo: M.J. Simms.)

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Figure 2.17
Generalized geological map of the Blue Anchor–Lilstock Coast GCR site showing specific locations mentioned in the text.

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Figure 2.18
Composite log of the Penarth Group and Lias Group succession exposed on the north Somerset coast. After Warrington and Ivimey-Cook (1995); with ammonite biohorizons in italics based on Page (1992) and Bloos and Page (2000a,b). In the Lias Group only limestones (vertical hatching) and mudstones (blank) are distinguished.

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Figure 2.19
The basal Lias Group and candidate Global Stratotype Section and Point (GSSP) for the base of the Hettangian Stage and Jurassic System at St Audrie’s Bay, Somerset. The lowest level at which Psiloceras has been found is in Bed 8, visible immediately above the person’s head. (Photo: M.J. Simms.)

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Figure 2.20
Limekiln Steps, East Quantoxhead, west of Kilve, the Global Stratotype Section and Point (GSSP) for the base of the Sinemurian Stage. The limestone platform at the foot of the cliff is the top of Bed 144 and the Hettangian–Sinemurian boundary lies in the thick shale unit at the base of the cliff (beds 145–146). (Photo: M.J. Simms.)

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Table 2.1
Table of approximate zone/subzone-pair thicknesses for the Hettangian and basal Sinemurian stages at six different locations. (* = figures estimated from total zone thickness.) Data from Cope et al. (1980a), Warrington and Ivimey-Cook (1995) and Page (1992, unpublished Geological Society Correlation Guide).

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Figure 2.21
Geological map of the area around the Hurcott Lane Cutting GCR site showing the location of other published sections through the Beacon Limestone Formation.

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Figure 2.22
Landslip exposing the Barrington Limestone Member of the Beacon Limestone Formation on the east side of Hurcott Lane. The conspicuous notch is at about the level of beds 11–13. (Photo: M.J. Simms.)

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Figure 2.23
Section through the Barrington Limestone Member of the Beacon Limestone Formation exposed in Hurcott Lane Cutting. After B. Constable, 1992, MSc thesis, Birkbeck College, London.

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Figure 2.24
Geological map of the Babylon Hill area.

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Figure 2.25
The Bridport Sand Formation exposed in Bradford Hollow, Babylon Hill, Yeovil. (Photo: M.J. Simms.)

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Figure 2.26
Sections through the Bridport Sand Formation on the south side of the A30 Sherborne Road (centred on ST 583 161) at Babylon Hill, Yeovil. After Prudden in Torrens (1969b).

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Figure 2.27
Geological map of the known outcrop area of the Ham Hill Limestone Member of the Bridport Sand Formation. After Wilson et al. (1958).

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Figure 2.28
Generalized lithostratigraphical succession and facies interpretation for the Ham Hill Limestone Member of the Bridport Sand Formation.

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Figure 2.29
The Main Building Stone of the Ham Hill Limestone Member in the working quarry on Ham Hill. (Photo: M.J. Simms.)

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Figure 2.30
Geology and location map of the Maes Down area.

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Figure 2.31
The Marlstone Rock Member of the Beacon Limestone Formation at Maes Down. (Photo: M.J. Simms.)

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