1-20 OF 52 RESULTS FOR

Longvillian

Results shown limited to content with bounding coordinates.
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
Journal Article
Published: 01 December 1989
Journal of the Geological Society (1989) 146 (6): 965–970.
...P. T. LEAT; R. S. THORPE Abstract Basalts of the Bedded Pyroclastic Formation, Snowdon Volcanic Group, North Wales of Longvillian (Caradoc) age, are heterogeneous in trace element composition, forming a mixing trend between ocean island basalt (OIB)-type and magmatic arc basalt. The two end-member...
Journal Article
Published: 01 November 1969
Geological Magazine (1969) 106 (6): 603–606.
Journal Article
Published: 01 April 1999
Journal of the Geological Society (1999) 156 (2): 301–316.
... sediments and minor basaltic lithic tuffs of the Cwm Eigiau Formation (Soudleyan-Longvillian). Llŷn Phase 2 is recorded by a 120 m thick pyroclastic flow (Allt Fawr Rhyolitic Tuff Formation) which interrupted Longvillian marine sedimentation (Cwm Eigiau Formation below; Dwyfach Formation above). This ash...
Series: AAPG Memoir, AAPG Memoir
Published: 01 January 1969
DOI: 10.1306/M12367C18
EISBN: 9781629812274
... different generic composition, as do pre-Longvillian faunas of Anglesey and southeast Ireland. Cluster analyses of these faunas and contemporaneous assemblages from North America and Europe show that the faunas of Scotland and western Ireland belong to an American Province and those of Anglesey...
Journal Article
Published: 01 March 1960
Geological Magazine (1960) 97 (2): 163–171.
... be restricted to the beds of the lower Longvillian stage, and the Alternata limestone applied to the upper Longvillian. GeoRef, Copyright 2004, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO...
Journal Article
Published: 01 December 2002
Scottish Journal of Geology (2002) 38 (2): 65–67.
... with that of the Kirkcolm Formation, Kilbucho, Scotland, indicating a Woolstonian age. Faunas from the middle member and the top part of the lower member of the Bardahessiagh Formation comprise species of which oldest record has been found from rocks of Longvillian age in Laurentia. References CANDELA , Y...
FIGURES | View All (4)
Journal Article
Journal: GSA Bulletin
Published: 01 December 1938
GSA Bulletin (1938) 49 (12_2): 1909–1924.
... Abstract The stages Costonian—Onnian correspond roughly to the lower half of the Upper Ordovician as conceived in England. They embrace seven stages, the Costonian, Harnagian, Soudleyan, Longvillian, Marshbrookian, Actonian, and Onnian. These stages are subdivided into 32 zones, the zonal indices...
Image
A correlation in cartoon form of upper Ordovician – lower Silurian strata f...
Published: 19 July 2013
– Rawtheyan; 4–2 – Cautleyan; W – Woolstonian; L – Longvillian; S – Soudleyan. Onnian deposits of the Nod Glas (Blaen-y-Cwm Shale, Pen-y-Garnedd Shale) shown solid; horizons above the Nod Glas and below Cautleyan zone 2 are undifferentiated Pusgillian
Series: Geological Society, London, Memoirs, Geological Society, London, Memoirs
Published: 01 January 2002
DOI: 10.1144/GSL.MEM.2002.025.01.14
EISBN: 9781862394001
... not mention the possibility of its being intrusive.) His placement of the Stile End beds in the Caradoc held the field for about a decade; but his allocation of the Drygill Shales to the Longvillian (mid-Caradoc) remained accepted in 2000. From the Cross Fell Inlier, Dean moved on to examine the fossils...
FIGURES | View All (12)
Book Chapter

Author(s)
David J. Siveter
Series: The Micropalaeontological Society, Special Publications, The Micropalaeontological Society, Special Publications
Published: 01 January 2009
DOI: 10.1144/TMS003.2
EISBN: 9781862396210
FIGURES | View All (6)
Journal Article
Published: 01 September 2003
Journal of the Geological Society (2003) 160 (5): 773–781.
... rocks in the overlying Dent Group, of Ashgill (Cautleyan) age ( Ingham et al . 1978 ). On the margins of the Lake District, to the north of the Carrock Fell Complex, and in the Cross Fell Inlier, the lowest Dent Group strata are of mid-Caradoc age (Longvillian; Fig. 2 ; Dean 1963 ; Burgess &...
FIGURES | View All (4)
Book Chapter

Series: Geological Society, London, Special Reports
Published: 01 January 2000
DOI: 10.1144/SR24.13
EISBN: 9781862396920
... to formational status by McConnell et al. 1994 ). The Grange Cottage Formation disconformably overlies the Llanvirn rocks. The Allen Andesite Formation is constrained by Soudleyan (or Longvillian: Owen & Parkes in press) siltstones below and the Longvillian mudstones of the Grange Hill Formation above...
FIGURES | View All (7)
Journal Article
Published: 01 April 1995
Journal of the Geological Society (1995) 152 (2): 209–212.
... et al. 1991). Two eruptive cycles are recognized, each being short-lived ( 4 Ma), and confined to a single chronostratigraphic stage. The first cycle was erupted during the Soudleyan (458-450Ma), and the second during the Longvillian (450-447Ma). The same volcanic stratigraphy is present on LIP...
Journal Article
Published: 01 April 1979
Journal of the Geological Society (1979) 136 (2): 137–144.
...) includes graptolitic shales in the Lower Llanvirn, followed by shallow shelf sediments in the Upper Llanvirn and Lower Llandeilo (Williams 1953). Progressively deeper environments are present during the later Llandeilo and basal Caradoc. The Longvillian and Marshbrookian stages are represented by mid...
Book Chapter

Series: Geological Society, London, Special Reports
Published: 01 January 2000
DOI: 10.1144/SR24.5
EISBN: 9781862396920
... the Aran volcanic activity ceased, at about the beginning of the Harnagian, and farther north new volcanic centres of the Llewelyn and Snowdon groups became active, through the Soudleyan and Longvillian and into the Woolstonian. The substadial divisions of the Caradoc are of use in dividing these thick...
FIGURES | View All (5)
Series: Geological Society, London, Geology of Series, Geological Society, London, Geology of Series
Published: 01 January 2006
DOI: 10.1144/GOEWP.3
EISBN: 9781862393882
... widespread during the Soudleyan and Longvillian Substages, but persisted until the end of the Woolstonian. Most of the activity was associated with shallow marine environments in which ephemeral volcanic islands were constructed. Close to the eastern margin of the basin, in the Breidden Hills and Shelve...
FIGURES | View All (47)
Journal Article
Published: 01 August 1990
Journal of the Geological Society (1990) 147 (4): 591–594.
... in the Upper Arenig-Llanvirn (e.g Shelve) and in the Soudleyan-Longvillian (mid-Caradoc) of Snowdonia (Kokelaar et al. 1984). Only during these times was sufficient, largely juvenile, volcanogenic detritus available to dominate the overall Sm-Nd isotopic signature of contemporaneous sediments. &Nd(f) values...
Journal Article
Published: 01 December 1991
Journal of the Geological Society (1991) 148 (6): 949–957.
... 1990; Perroud et al. 1990). These studies have yet to include the sampling of a continuous vertical section however. Supplemental data Although t ey do not display stratigraphically-related reversals, polarity data from Longvillian (middle Caradoc) equivalents of the Snowdon volcanic rocks, Lleyn...
Journal Article
Published: 01 September 1985
Journal of the Geological Society (1985) 142 (5): 875–888.
... Scott S. D. Kissin G. A. Sphalerite composition in the Zn-Fe-S system below 300°C. Econ. Geol 1973 68 475 9 Williams H. The geology of Snowdon (North Wales) Q J geol Soc London 1927 83 346 431 Wright, D. K. 1979. A fauna1 analysis of Soudleyanl Longvillian rocks...
Series: Geological Society, London, Special Publications, Geological Society, London, Special Publications
Published: 01 January 2002
DOI: 10.1144/GSL.SP.2002.201.01.05
EISBN: 9781862394490
... Llandeilian (late Darriwil-ian) to Aurelucian ( stentor Biozone), early Harnagian ( dalbyensis Biozone), and late Har-nagian to Longvillian ( cervicornis Biozone) times. However, we made cluster and CS analyses for the stentor biozone only, because impoverished assemblages were recovered from the other...
FIGURES | View All (13)