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Cravenoceras leion

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Journal Article
Published: 01 November 2002
Proceedings of the Yorkshire Geological Society (2002) 54 (2): 111–119.
...D. Korn; J. W. Tilsley SUMMARY The Cravenoceras leion Marine Band at Backdale Mine has yielded a stratigraphically important ammonoid fauna consisting of the species Cravenoceras leion Bisat 1930 , Edmooroceras medusa ( Yates 1961 ) and Girtyoceras sp. C. leion, in particular, is represented...
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Correlation of the stratigraphical sections. For explanation of symbols and...
Published: 01 November 2005
Fig. 3. Correlation of the stratigraphical sections. For explanation of symbols and facies see Figure 5 . L. nodosa, Lochriea nodosa; C. okense, Calcifolium okense ; Cr. leion, Cravenoceras leion.
Journal Article
Published: 02 May 2019
Petroleum Geoscience (2020) 26 (2): 325–345.
... Formation, is taken at the base of the Cravenoceras leion Marine Band ( Fig. 2 ). In the East Midlands, the top of the formation coincides with the base of the Millstone Grit Group, locally represented by the turbidite succession of the Mam Tor Sandstones or fluvial sandstones of the Kinderscout Grit...
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Journal Article
Published: 01 November 2003
Proceedings of the Yorkshire Geological Society (2003) 54 (4): 237–251.
... eakringensis and Baliothyreus becki have been collected in situ only from the Cravenoceras leion Marine Band at the base of the Edale Shales at Backdale Mine, near Hassop. In the 1980s JWT collected loose blocks of dark, bituminous limestone from points along Mill Lane, between Eyam and Stoney Middleton...
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Journal Article
Published: 01 November 2005
Proceedings of the Yorkshire Geological Society (2005) 55 (4): 287–300.
...Fig. 3. Correlation of the stratigraphical sections. For explanation of symbols and facies see Figure 5 . L. nodosa, Lochriea nodosa; C. okense, Calcifolium okense ; Cr. leion, Cravenoceras leion. ...
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Journal Article
Published: 01 September 2008
Journal of Paleontology (2008) 82 (5): 906–923.
... ranges and the Lochriea lineage is absent, on which at present, most investigation on the Visean/Serpukhovian stage boundary is focused. The ammonoid Emstites leion ( Bisat, 1930 ) (= Cravenoceras ) is considered to be the best marker for defining the Visean/Serpukhovian stage boundary, although...
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Journal Article
Published: 05 February 2021
Journal of the Geological Society (2021) 178 (3): jgs2020-170.
... with that of the Serpukhovian, because Johnson et al. (1962) recorded the ammonoid Cravenoceras leion in mudstones above the Great Limestone, but they selected this limestone unit as the base of the Namurian due to its forming a regional mappable horizon. However, this difference is negligible, and the correlation...
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Journal Article
Published: 01 January 2004
Micropaleontology (2004) 50 (1): 89–103.
... for assemblages characterized by the presence of Cingulizonates cf. capistratus with Crassispora aculeata, but without those other taxa, in the lower part of the CN Biozone. The range top of C. aculeata occurs in strata above the Great Limestone in northern England. This horizon lies above the Cravenoceras leion...
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Journal Article
Published: 29 May 2018
Petroleum Geoscience (2018) 24 (3): 287–322.
... mudrocks with thinly interbedded clastics and carbonates is developed. The base of the Upper Bowland Shale defined at the marine flooding surface which introduces the ammonoid Emstites leion (formerly Cravenoceras leion ) marks the base of the Pendleian Stage (Namurian Series). The lower (E1a) part...
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Journal Article
Published: 22 May 2014
Proceedings of the Yorkshire Geological Society (2014) 60 (1): 29–51.
... Yorkshire ( Dean et al . 2011 ). This is lower in the succession than the base of the Pendleian Substage, which is taken at the base of the Cravenoceras leion Marine Band ( Ramsbottom et al . 1978 ; Waters & Condon 2012 ). The presence of C. leion in mudstones above the Great Limestone...
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Journal Article
Published: 01 April 1990
Journal of the Geological Society (1990) 147 (2): 287–300.
... and ?eticulatisporites carnosu: Cravenoceras malhamense Eumorphcceras Cravenoceras leion pseudobiliigue tPENDLEIAN )INANT VISEAN BRIGANTIAN \N (pars) (pars) (pars) -l C. leion I E. hudsoni E. stubblefieldi E. tornauisti Fig. 2. Silesian subdivisions and zones discussed in this paper (after Ramsbottom et al. 1978; Owens...
Journal Article
Published: 01 November 2012
Journal of the Geological Society (2012) 169 (6): 713–721.
... boundary of the Namurian western European regional stage is defined as at the base of strata containing the earliest occurrence of the ammonoid Cravenoceras leion ( van Leckwijck 1960 ). In the Pennine Basin, this corresponds to the base of the E1a1 ( C. leion ) marine band, which occurs 15.5 sedimentary...
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Journal Article
Published: 01 November 2011
Journal of Paleontology (2011) 85 (6): 1105–1127.
..., which is defined by the first appearance of Cravenoceras leion, a datum well established in the British Isles ( Bisat, 1930 ). Ammonoids, in particular C. leion, are not free of controversy and their identification depends on well-preserved specimens. Furthermore, their usefulness...
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Journal Article
Published: 06 April 2018
Proceedings of the Yorkshire Geological Society (2018) 62 (1): 51–57.
... of a significant low-gamma interval interpreted as a major flooding event (which, if the correlation is correct, would represent the horizon of the Emstites leion Marine Band). Andrews (2013) ambiguously marked two points for the base of the Pendleian (marked as the top of the Brigantian). One is at a similar...
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Journal Article
Published: 01 May 2012
Proceedings of the Yorkshire Geological Society (2012) 59 (1): 25–36.
... referred to in the Midlands as the Edale Shale or Edale Mudstone Group, is now classified as the Bowland Shale Formation of the Craven Group ( Waters et al . 2009 ). In the south part of the basin, the formation extends from the Cravenoceras leion Marine Band, the base of which defines the base...
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Journal Article
Published: 01 May 2013
Proceedings of the Yorkshire Geological Society (2013) 59 (3): 187–194.
...., Nuculoceras; Ct., Cravenoceratoides; C., Cravenoceras Reg. no. Locality Ammonoid Age Reference Remarks GSM 85212 River Darwen, Samlesbury Bottoms, Lancashire N. nuculum Arnsbergian, E 2c 2–E 2c 4 Price et al . (1963, p. 60, pl. 3 fig. 2) Labial concavity, short base, side cusp...
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Series: Geological Society, London, Special Reports
Published: 01 January 2011
DOI: 10.1144/SR26.12
EISBN: 9781862396944
... with Cravenoceras leion +8 ( Arthurton et al. 1988 ). Above it the Yoredale Group is represented by the Stainmore Formation, which ranges throughout the early Namurian (Pendleian to ? early Kinderscoutian) in the Stainmore Trough and Alston Block (Fig. 38 , Cols 6 & 8). On the Askrigg Block (Fig. 38 , Col...
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Journal Article
Published: 01 May 2011
Proceedings of the Yorkshire Geological Society (2011) 58 (3): 173–196.
...) on the southern Askrigg Block at Fountains Fell, based on the first stratigraphical appearance of the ammonoid Cravenoceras leion in mudstones close above the Underset (= Four Fathom) Limestone and below the Main Limestone ( Arthurton et al . 1988 , pp. 36, 71). These authors suggested that the base...
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Journal Article
Published: 02 April 2020
Petroleum Geoscience (2020) 26 (2): 303–324.
...–Brigantian) Lower Bowland Shale and (Pendelian) Upper Bowland Shale Formations, the contact between which is marked by the Cravenoceras leion marine band ( Aitkenhead et al. 1992 ) representing the boundary between the Dinantian and Silesian (Visean and Namurian). The upper boundary of the BSG is marked...
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Journal Article
Journal: AAPG Bulletin
Published: 01 February 2010
AAPG Bulletin (2010) 94 (2): 189–219.
... is defined by the Cravenoceras leion and Cravenoceras cowlingense goniatite (ammonoid) bands at its base and top, respectively ( Figure 1C ). Up to 1500 m (4921 ft) of Mississippian to Pennsylvanian siliciclastic sediments has been proven in the nearby Boulsworth borehole, but the original thickness over...
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