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Volume 19: British Silurian Stratigraphy — Chapter 06
 

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Chap 06
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Figure 6.1
Distribution of the Geological Conservation Review sites for the PÍídolí Series, set against the palaeogeographical elements of Silurian Britain.

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Figure 6.2
Approximate outcrop of PÍídolí strata in England and Wales, with relationship to older strata (delimited as in Bassett et al., 1982).

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Figure 6.3
The Whitcliffe Group (Ludlow Series)–Downton Group (PÍídolí Series) boundary (marked by the position of the hammer head) at Ludford Lane (‘Whitcliffe Road’), Ludlow; see also Figure 6.5. (Photo: David J. Siveter.)

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Figure 6.4
Hummocky cross-stratification sequences in the Sandstone Member, Downton Castle Sandstone Formation, along the A49 road at Ludford Corner, Ludlow, Shropshire. (Photo: David J. Siveter.)

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Figure 6.5
Lithological and faunal succession across the Whitcliffe Group (Ludlow Series)/Downton Group (PÍídolí Series) boundary at Ludford Lane (see Figure 6.3), Ludlow, Shropshire (after Bassett et al., 1982; modified from Siveter et al., 1989).

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Figure 6.6
Cast of external mould of the ostracod Frostiella groenvalliana Martinsson, 1963 (tecnomorphic left valve, × 24) from the Platyschisma Shale Member, Downton Castle Sandstone Formation, PÍídolí Series; about 1.5 m above Ludlow Bone Bed Member, north side of Ludford Lane, Ludlow, Shropshire. (Photo: David J. Siveter.)

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Figure 6.7
Correlation of latest Ludlow–PÍídolí ostracod faunas of Britain, Baltoscandia and the Czech Republic (after Hansch and Siveter, 1994, fig. 1; see also Bassett et al., 1982, fig. 7; Siveter 1989, fig. 164, and Miller, 1995, fig. 14). Symbols denote the presence (mostly only the earliest occurrence) of a fauna within a stratigraphical unit, not their exact positions. Vertical columns not to scale.

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Figure 6.8
Reconstruction of Palaeotarbus Dunlop, 1999, a trigonotarbid arachnid, based partly on material from the Downton Castle Sandstone Formation, Ludford Corner, Ludlow, Shropshire. Carapace is c. 1 mm long (from Dunlop, 1996).

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Figure 6.9
Geology of the Netherton Anticline, near Dudley, West Midlands (based on an unpublished 1936 map by H.B. Whittington and after Hardie, 1971).

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Figure 6.10
Generalized composite section of the Silurian and Carboniferous rocks at Brewin’s Bridge and in the tramway cutting (see text for thicknesses), Netherton Anticline, near Dudley, West Midlands.

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Figure 6.11
Section in the north bank of the canal cutting at Brewin’s Bridge, Netherton Anticline, near Dudley, West Midlands (after Whitehead and Pocock, 1947).

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Figure 6.12
Geology of the general area of Capel Horeb Quarry in the Afon Gwydderig Valley, Carmarthenshire (modified from Potter and Price, 1965, fig. 4).

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Figure 6.13
The geology of Capel Horeb Quarry, Carmarthenshire (modified from Siveter et al., 1989, fig. 93).

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Figure 6.14
Capel Horeb Quarry, Carmarthenshire, looking approximately north (see Figure 6.15). (Photo: P.D. Lane.)

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Figure 6.15
Interpretation of the geology of Capel Horeb Quarry, Carmarthenshire, illustrating the main stratigraphical divisions, and the surface of unconformity (see Figure 6.14; after Edwards and Richardson in Friend and Williams, 1978).

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Figure 6.16
The geology of the Milford Haven area (modified from Allen and Williams, 1978).

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Figure 6.17
The general structure of Little Castle Head section (modified from Hancock et al., 1982).

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Figure 6.18
A measured representative sedimentary log of part of the PÍídolí Sandy Haven Formation in the Little Castle Head–Sandyhaven Pill area, Pembrokeshire (modified from Allen and Williams, 1978).

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Figure 6.19
Schematic sedimentary log of the Townsend Tuff Bed (modified from Allen and Williams, 1981).

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Figure 6.20
General geology of the Albion Sands to Gateholm Island area, Pembrokeshire (after Williams in Friend and Williams, 1978).

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Figure 6.21
View from Sandy Lane, looking south-west across Marloes Sands to Gateholm Island (centre distance) and Skokholm Island (centre left). Strata dip at high angle and young seawards, from right to left. (Photo: David J. Siveter.)

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Figure 6.22
The lithostratigraphy of the Albion Sands to Gateholm Island area, Pembrokeshire, with possible relationship to chronostratigraphy.

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Figure 6.23
Sedimentary log of the Albion Sands Formation, the Lindsway Bay Formation, and the lower part of the Sandy Haven Formation at the Albion Sands and Gateholm Island site (after Williams in Friend and Williams, 1978).

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Figure 6.24
Geological map of the area around Lower Wallop Quarry, Shropshire (modified from Das Gupta, 1932).

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Figure 6.25
The main face of Lower Wallop Quarry, Shropshire; metre rule for scale. (Photo: P.D. Lane, June 1996.)

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Figure 6.26
Log of previously exposed section in Lower Wallop Quarry, Shropshire, exposed a few metres to the east (right) of the main face shown in Figure 6.25 (modified from Miller, 1995, text-fig. 11).

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Figure 6.27
Stratigraphical range of ostracods in Lower Wallop Quarry, Shropshire (modified from Miller, 1995, text-fig. 12).

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Figure 6.28
The Helm, Cumbria (a) outcrop displaying the Helm Member (PÍídolí Series) of the Kirkby Moor Formation, (b) close-up of the strata. (Photos: David J. Siveter.)

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Figure 6.29
Representative log of the Helm Member of the Kirkby Moor Formation at The Helm (SD 5307 881; modified from King, 1992). Beds are assigned to one of several lithofacies (see text), numbered to match similar facies in the main Kirkby Moor Formation (see GCR site report for Benson Knott); in this particular section at The Helm, Cumbria, only lithofacies 3, 4 and 6 occur.

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