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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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North Africa
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Ghadames Basin (1)
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Libya (1)
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Tunisia (1)
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Sahara (2)
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Asia
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Canada
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Europe
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North America
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South America
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United States
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Missouri
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Utah
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USSR (1)
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elements, isotopes
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metals
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alkali metals (1)
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fossils
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burrows (1)
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Graptolithina
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Graptoloidea
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Invertebrata
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Chelicerata
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Trilobitomorpha
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Brachiopoda
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Articulata
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Inarticulata
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Cnidaria
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Anthozoa
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Tabulata
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Heliolitida
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geologic age
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Paleozoic
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Devonian
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Read Bay Formation (2)
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igneous rocks
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igneous rocks (1)
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metamorphic rocks
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turbidite (1)
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Primary terms
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Africa
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North Africa
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Ghadames Basin (1)
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Libya (1)
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Tunisia (1)
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Sahara (2)
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Arctic region (1)
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Asia
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Indian Peninsula
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India (1)
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Kashmir (1)
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Canada
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Arctic Archipelago (3)
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Eastern Canada
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Maritime Provinces
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New Brunswick (1)
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Mackenzie Mountains (1)
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Nunavut
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Somerset Island (2)
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Western Canada
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Northwest Territories (4)
-
-
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Europe
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Baltic region
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Estonia
-
Saaremaa (1)
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-
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Southern Europe
-
Iberian Peninsula
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Spain
-
Cantabrian Mountains (1)
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Western Europe
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France (1)
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Scandinavia
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Norway (1)
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Sweden
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Gotland Sweden (2)
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United Kingdom
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Great Britain
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England
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Cumbria England
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Westmorland England (2)
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Shropshire England (4)
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Welsh Borderland (1)
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Wales
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Powys Wales
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Radnorshire Wales (1)
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-
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-
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glacial geology (1)
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Graptolithina
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Graptoloidea
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Monograptina
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Monograptus (1)
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-
-
-
igneous rocks (1)
-
Invertebrata
-
Arthropoda
-
Chelicerata
-
Merostomata
-
Eurypterida (1)
-
-
-
Trilobitomorpha
-
Trilobita (1)
-
-
-
Brachiopoda
-
Articulata
-
Orthida (3)
-
Pentamerida (1)
-
Rhynchonellida (1)
-
Spiriferida (1)
-
Strophomenida (2)
-
-
Inarticulata
-
Lingula (1)
-
-
-
Cnidaria
-
Anthozoa
-
Zoantharia
-
Tabulata
-
Heliolitida
-
Heliolitidae
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Heliolites (1)
-
-
-
-
-
-
-
Echinodermata
-
Crinozoa
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Crinoidea (2)
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-
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Mollusca (1)
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Porifera
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Stromatoporoidea (1)
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Protista (1)
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Vermes
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Annelida (1)
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scolecodonts (1)
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maps (1)
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metals
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alkali metals (1)
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North America
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Rocky Mountains (1)
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paleoecology (4)
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paleogeography (3)
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paleontology (18)
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Paleozoic
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Devonian
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Lower Devonian
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Gedinnian (1)
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Siegenian (1)
-
-
-
Read Bay Formation (2)
-
Silurian
-
Bainbridge Formation (1)
-
Lower Silurian (10)
-
Middle Silurian
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Roberts Mountains Formation (1)
-
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Niagaran (1)
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Upper Silurian (31)
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palynomorphs
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acritarchs (1)
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Chitinozoa (1)
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petrology (1)
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sedimentary petrology (1)
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sedimentary rocks
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clastic rocks
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black shale (1)
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red beds (1)
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sandstone (2)
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shale (1)
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sedimentary structures (1)
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sedimentation (1)
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sediments
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clastic sediments
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outwash (1)
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till (1)
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South America
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Bolivia
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Cochabamba Bolivia (1)
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-
-
stratigraphy (7)
-
United States
-
Missouri
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Perry County Missouri (1)
-
-
Utah
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Box Elder County Utah (1)
-
-
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USSR (1)
-
-
sedimentary rocks
-
sedimentary rocks
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clastic rocks
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black shale (1)
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red beds (1)
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sandstone (2)
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shale (1)
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turbidite (1)
-
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sedimentary structures
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burrows (1)
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sedimentary structures (1)
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sediments
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sediments
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clastic sediments
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outwash (1)
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till (1)
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turbidite (1)
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Ludlovian
Stratigraphic setting of the type specimen of Carpocrinus arcticus Frest and Strimple from the Late Silurian of Somerset Island, Arctic Canada
Atrypella scheii (Holtedahl) and Atrypella phoca (Salter), (Silurian Brachiopoda)
Carpocrinus (Echinodermata: Crinoidea) from the Late Silurian of Somerset Island, Northwest Territories, Canada
A Lingula-Heliolites association from the Silurian of Gotland, Sweden
Significance of a new fossil locality containing a Salopina community in the Waweig Formation (Silurian–uppermost Ludlow/Pridoli) of southwest New Brunswick
Late Silurian brachiopods from northwestern Utah
Resserella sabrinae Bassett, in the Wenlock of Wales and the Welsh Borderland
Le Silurien en Tunisie; ses relations avec le Silurien de Libye nord-occidentale
The boundary between the Wenlock and Ludlow Series [letter]
Silurian Brachiopoda, Upper Allen Bay Formation, Griffiths Island, Arctic Archipelago, and Uppermost Whittaker Formation, Mackenzie Mountains, Northwest Territories
This paper is a compilation of published information considered pertinent to the correlation of the 450 Silurian stratigraphic units now recognized in the British Isles. The number of units reflects both the geologic complexity of these islands and the fact that much careful description and geologic mapping was done during the past two centuries. The accompanying bibliography contains more than 800 titles. Graptolitic facies are widespread in the British Isles, and the graptolitic zonal sequence is used here to form the basis of correlation. In the shelf facies where graptolites are less common, brachiopod lineages are becoming increasingly useful in correlation. Recent work on other groups, particularly conodonts, spores, and ostracodes, provides further bases for correlation. In early Paleozoic time, Britain and Ireland were traversed by an ocean basin, called the Iapetus Ocean, which in Silurian time, however, provided no barrier to migration as most marine animals are common to both sides. The ocean-floor deposits are characterized by thin, pelagic shale sequences and thick graywacke turbidite sequences, all within the graptolitic facies. Shelf deposits occur along both margins of the ocean, in the Welsh Borderland and Wales on the southeast, and in Scotland and Ireland on the northwest. These shelf areas are characterized by clastic shelly facies with limestone locally developed. Nonmarine deposits are mainly associated with Late Silurian time, just prior to the late phases of the Caledonian orogeny, when all of the British Isles except southwest England became a mountainous, nonmarine area.