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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
North Africa
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
Anti-Atlas (2)
-
-
-
Morocco
-
Moroccan Atlas Mountains
-
Anti-Atlas (2)
-
-
-
-
-
Asia
-
Central Asia
-
Kazakhstan
-
Eastern Kazakhstan
-
Chingis-Tau (1)
-
Semipalatinsk Kazakhstan (1)
-
-
-
-
Far East
-
China
-
Chongqing China (2)
-
Gansu China (1)
-
Guangxi China (1)
-
Guizhou China (1)
-
Henan China (2)
-
Hubei China (1)
-
Hunan China (1)
-
Qilian Mountains (1)
-
Sichuan Basin (2)
-
Sichuan China (1)
-
Xinjiang China
-
Tarim Basin (3)
-
-
Yangtze Platform (3)
-
Yunnan China (1)
-
-
-
Himalayas
-
Kumaun Himalayas (1)
-
-
Indian Peninsula
-
India
-
Himachal Pradesh India
-
Spiti (1)
-
-
Uttarakhand India
-
Chamoli India (1)
-
-
-
-
-
Atlantic Ocean
-
North Atlantic
-
Baltic Sea (1)
-
Hudson Bay (1)
-
Hudson Strait (1)
-
-
-
Australasia
-
Australia
-
New South Wales Australia (1)
-
-
-
Caledonides (1)
-
Canada
-
Eastern Canada
-
Baffin Island (2)
-
Newfoundland and Labrador
-
Newfoundland (1)
-
-
Ontario
-
Manitoulin District Ontario
-
Manitoulin Island (2)
-
-
Simcoe County Ontario (2)
-
-
Quebec
-
Anticosti Island (2)
-
-
-
Hudson Bay (1)
-
Mackenzie Mountains (1)
-
Nunavut
-
Baffin Island (2)
-
Southampton Island (1)
-
-
Queen Elizabeth Islands
-
Parry Islands (1)
-
-
Western Canada
-
Manitoba
-
Lake Winnipeg (1)
-
Winnipeg Manitoba (1)
-
-
Yukon Territory (1)
-
-
-
Commonwealth of Independent States
-
Kazakhstan
-
Eastern Kazakhstan
-
Chingis-Tau (1)
-
Semipalatinsk Kazakhstan (1)
-
-
-
-
Cornwallis Island (1)
-
Dunnage Zone (1)
-
Europe
-
Baltic region
-
Estonia (3)
-
-
Central Europe
-
Czech Republic
-
Bohemia
-
Prague Basin (1)
-
-
-
-
Southern Europe
-
Iberian Peninsula
-
Spain
-
Aragon Spain
-
Saragossa Spain (1)
-
-
Iberian Mountains (1)
-
-
-
-
Western Europe
-
Ireland (1)
-
Scandinavia
-
Denmark
-
Bornholm (1)
-
-
Sweden
-
Dalarna Sweden
-
Siljan (1)
-
-
Gotland Sweden (1)
-
-
-
United Kingdom
-
Great Britain
-
England
-
Shropshire England (1)
-
-
Scotland
-
Ayrshire Scotland
-
Girvan Scotland (1)
-
-
Borders region Scotland (1)
-
-
Wales (1)
-
-
-
-
-
Midlands (1)
-
North America
-
Appalachian Basin (1)
-
Appalachians
-
Northern Appalachians (1)
-
-
-
Pacific Ocean
-
North Pacific
-
Northwest Pacific
-
Celebes Sea (1)
-
-
-
West Pacific
-
Indonesian Seas
-
Celebes Sea (1)
-
-
Northwest Pacific
-
Celebes Sea (1)
-
-
-
-
Roberts Mountains (1)
-
Southern Uplands (1)
-
United States
-
Alabama (1)
-
Alaska (1)
-
Cincinnati Arch (2)
-
Eastern U.S. (1)
-
Indiana
-
Dearborn County Indiana (1)
-
Franklin County Indiana (1)
-
Jefferson County Indiana (1)
-
-
Iowa
-
Winneshiek County Iowa (1)
-
-
Kentucky
-
Boone County Kentucky (1)
-
Franklin County Kentucky (1)
-
Kenton County Kentucky (1)
-
Mason County Kentucky (1)
-
Trimble County Kentucky (1)
-
-
Maine
-
Aroostook County Maine (1)
-
-
Michigan
-
Michigan Upper Peninsula
-
Delta County Michigan (1)
-
-
-
Minnesota
-
Fillmore County Minnesota (1)
-
Olmsted County Minnesota (1)
-
-
Mississippi Valley
-
Upper Mississippi Valley (1)
-
-
Nevada (1)
-
New England (1)
-
New York
-
Lewis County New York (1)
-
Oneida County New York (2)
-
-
Ohio
-
Clermont County Ohio (2)
-
Hamilton County Ohio
-
Cincinnati Ohio (2)
-
-
-
Oklahoma (1)
-
Virginia (1)
-
Wisconsin
-
Columbia County Wisconsin (1)
-
Dane County Wisconsin (1)
-
Dodge County Wisconsin (1)
-
Grant County Wisconsin (1)
-
Green County Wisconsin (1)
-
-
-
-
commodities
-
bitumens (1)
-
petroleum
-
natural gas
-
shale gas (2)
-
-
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (10)
-
-
isotope ratios (11)
-
isotopes
-
stable isotopes
-
C-13/C-12 (10)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (3)
-
-
-
metals
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
oxygen
-
O-18/O-16 (3)
-
-
-
fossils
-
borings (2)
-
burrows (1)
-
Chordata
-
Vertebrata (4)
-
-
Graptolithina
-
Graptoloidea (1)
-
-
Hemichordata (4)
-
ichnofossils
-
Trypanites (2)
-
-
Invertebrata
-
Arthropoda
-
Chelicerata
-
Merostomata
-
Eurypterida (1)
-
-
-
Mandibulata
-
Crustacea
-
Ostracoda (2)
-
-
-
Trilobitomorpha
-
Trilobita
-
Phacopida
-
Phacopina (1)
-
-
-
-
-
Brachiopoda
-
Articulata
-
Orthida (2)
-
Pentamerida (1)
-
Rhynchonellida (1)
-
Spiriferida
-
Atrypidae (1)
-
-
Strophomenida
-
Strophomena (1)
-
-
-
-
Bryozoa
-
Cryptostomata (2)
-
Trepostomata (6)
-
-
Cnidaria
-
Anthozoa (1)
-
Scyphozoa
-
Conulariida (1)
-
-
-
Echinodermata
-
Crinozoa
-
Crinoidea
-
Inadunata (1)
-
-
-
Homalozoa
-
Homoiostelea (1)
-
-
-
Mollusca
-
Bivalvia (2)
-
Cephalopoda
-
Nautiloidea (2)
-
-
Gastropoda (3)
-
Monoplacophora (1)
-
Polyplacophora (1)
-
Tentaculitida (1)
-
-
Protista
-
Radiolaria (1)
-
-
Vermes
-
Polychaeta (1)
-
scolecodonts (1)
-
-
-
microfossils
-
Chitinozoa (1)
-
Conodonta (6)
-
problematic microfossils (1)
-
scolecodonts (1)
-
-
palynomorphs
-
Chitinozoa (1)
-
-
Plantae
-
algae
-
Chlorophyta (2)
-
-
-
problematic fossils
-
problematic microfossils (1)
-
-
Pterobranchia (3)
-
-
geochronology methods
-
U/Pb (3)
-
-
geologic age
-
Paleozoic
-
Cambrian (1)
-
Devonian (1)
-
Ellis Bay Formation (1)
-
lower Paleozoic
-
Cape Phillips Formation (1)
-
-
Ordovician
-
Lexington Limestone (1)
-
Middle Ordovician
-
Deicke Bentonite Bed (1)
-
Millbrig Bentonite Bed (1)
-
Platteville Formation (1)
-
-
Trenton Group (2)
-
Upper Ordovician
-
Caradocian (1)
-
Cincinnatian
-
Maysvillian (1)
-
Richmondian (1)
-
-
Fairview Formation (3)
-
Hirnantian (8)
-
Katian (63)
-
Kope Formation (2)
-
Lorraine Group (1)
-
Red River Formation (1)
-
Sandbian (12)
-
Whitewater Formation (1)
-
Wufeng Formation (2)
-
-
Utica Shale (1)
-
Womble Shale (1)
-
-
Silurian
-
Lower Silurian
-
Llandovery
-
Rhuddanian (2)
-
-
-
-
-
-
igneous rocks
-
ophiolite (1)
-
-
metamorphic rocks
-
K-bentonite (2)
-
ophiolite (1)
-
-
minerals
-
K-bentonite (2)
-
phosphates
-
apatite (2)
-
-
silicates
-
framework silicates
-
silica minerals
-
quartz (1)
-
-
-
orthosilicates
-
nesosilicates
-
zircon group
-
zircon (2)
-
-
-
-
sheet silicates
-
clay minerals (1)
-
-
-
-
Primary terms
-
absolute age (3)
-
Africa
-
North Africa
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
Anti-Atlas (2)
-
-
-
Morocco
-
Moroccan Atlas Mountains
-
Anti-Atlas (2)
-
-
-
-
-
Asia
-
Central Asia
-
Kazakhstan
-
Eastern Kazakhstan
-
Chingis-Tau (1)
-
Semipalatinsk Kazakhstan (1)
-
-
-
-
Far East
-
China
-
Chongqing China (2)
-
Gansu China (1)
-
Guangxi China (1)
-
Guizhou China (1)
-
Henan China (2)
-
Hubei China (1)
-
Hunan China (1)
-
Qilian Mountains (1)
-
Sichuan Basin (2)
-
Sichuan China (1)
-
Xinjiang China
-
Tarim Basin (3)
-
-
Yangtze Platform (3)
-
Yunnan China (1)
-
-
-
Himalayas
-
Kumaun Himalayas (1)
-
-
Indian Peninsula
-
India
-
Himachal Pradesh India
-
Spiti (1)
-
-
Uttarakhand India
-
Chamoli India (1)
-
-
-
-
-
Atlantic Ocean
-
North Atlantic
-
Baltic Sea (1)
-
Hudson Bay (1)
-
Hudson Strait (1)
-
-
-
Australasia
-
Australia
-
New South Wales Australia (1)
-
-
-
biogeography (6)
-
bitumens (1)
-
Canada
-
Eastern Canada
-
Baffin Island (2)
-
Newfoundland and Labrador
-
Newfoundland (1)
-
-
Ontario
-
Manitoulin District Ontario
-
Manitoulin Island (2)
-
-
Simcoe County Ontario (2)
-
-
Quebec
-
Anticosti Island (2)
-
-
-
Hudson Bay (1)
-
Mackenzie Mountains (1)
-
Nunavut
-
Baffin Island (2)
-
Southampton Island (1)
-
-
Queen Elizabeth Islands
-
Parry Islands (1)
-
-
Western Canada
-
Manitoba
-
Lake Winnipeg (1)
-
Winnipeg Manitoba (1)
-
-
Yukon Territory (1)
-
-
-
carbon
-
C-13/C-12 (10)
-
-
Chordata
-
Vertebrata (4)
-
-
climate change (3)
-
crystal chemistry (1)
-
data processing (1)
-
diagenesis (2)
-
ecology (1)
-
Europe
-
Baltic region
-
Estonia (3)
-
-
Central Europe
-
Czech Republic
-
Bohemia
-
Prague Basin (1)
-
-
-
-
Southern Europe
-
Iberian Peninsula
-
Spain
-
Aragon Spain
-
Saragossa Spain (1)
-
-
Iberian Mountains (1)
-
-
-
-
Western Europe
-
Ireland (1)
-
Scandinavia
-
Denmark
-
Bornholm (1)
-
-
Sweden
-
Dalarna Sweden
-
Siljan (1)
-
-
Gotland Sweden (1)
-
-
-
United Kingdom
-
Great Britain
-
England
-
Shropshire England (1)
-
-
Scotland
-
Ayrshire Scotland
-
Girvan Scotland (1)
-
-
Borders region Scotland (1)
-
-
Wales (1)
-
-
-
-
-
geochemistry (2)
-
Graptolithina
-
Graptoloidea (1)
-
-
Hemichordata (4)
-
ichnofossils
-
Trypanites (2)
-
-
Invertebrata
-
Arthropoda
-
Chelicerata
-
Merostomata
-
Eurypterida (1)
-
-
-
Mandibulata
-
Crustacea
-
Ostracoda (2)
-
-
-
Trilobitomorpha
-
Trilobita
-
Phacopida
-
Phacopina (1)
-
-
-
-
-
Brachiopoda
-
Articulata
-
Orthida (2)
-
Pentamerida (1)
-
Rhynchonellida (1)
-
Spiriferida
-
Atrypidae (1)
-
-
Strophomenida
-
Strophomena (1)
-
-
-
-
Bryozoa
-
Cryptostomata (2)
-
Trepostomata (6)
-
-
Cnidaria
-
Anthozoa (1)
-
Scyphozoa
-
Conulariida (1)
-
-
-
Echinodermata
-
Crinozoa
-
Crinoidea
-
Inadunata (1)
-
-
-
Homalozoa
-
Homoiostelea (1)
-
-
-
Mollusca
-
Bivalvia (2)
-
Cephalopoda
-
Nautiloidea (2)
-
-
Gastropoda (3)
-
Monoplacophora (1)
-
Polyplacophora (1)
-
Tentaculitida (1)
-
-
Protista
-
Radiolaria (1)
-
-
Vermes
-
Polychaeta (1)
-
scolecodonts (1)
-
-
-
isotopes
-
stable isotopes
-
C-13/C-12 (10)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (3)
-
-
-
metals
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
metasomatism (1)
-
museums (1)
-
North America
-
Appalachian Basin (1)
-
Appalachians
-
Northern Appalachians (1)
-
-
-
oxygen
-
O-18/O-16 (3)
-
-
Pacific Ocean
-
North Pacific
-
Northwest Pacific
-
Celebes Sea (1)
-
-
-
West Pacific
-
Indonesian Seas
-
Celebes Sea (1)
-
-
Northwest Pacific
-
Celebes Sea (1)
-
-
-
-
paleoclimatology (6)
-
paleoecology (19)
-
paleogeography (7)
-
Paleozoic
-
Cambrian (1)
-
Devonian (1)
-
Ellis Bay Formation (1)
-
lower Paleozoic
-
Cape Phillips Formation (1)
-
-
Ordovician
-
Lexington Limestone (1)
-
Middle Ordovician
-
Deicke Bentonite Bed (1)
-
Millbrig Bentonite Bed (1)
-
Platteville Formation (1)
-
-
Trenton Group (2)
-
Upper Ordovician
-
Caradocian (1)
-
Cincinnatian
-
Maysvillian (1)
-
Richmondian (1)
-
-
Fairview Formation (3)
-
Hirnantian (8)
-
Katian (63)
-
Kope Formation (2)
-
Lorraine Group (1)
-
Red River Formation (1)
-
Sandbian (12)
-
Whitewater Formation (1)
-
Wufeng Formation (2)
-
-
Utica Shale (1)
-
Womble Shale (1)
-
-
Silurian
-
Lower Silurian
-
Llandovery
-
Rhuddanian (2)
-
-
-
-
-
palynomorphs
-
Chitinozoa (1)
-
-
petroleum
-
natural gas
-
shale gas (2)
-
-
-
Plantae
-
algae
-
Chlorophyta (2)
-
-
-
plate tectonics (2)
-
problematic fossils
-
problematic microfossils (1)
-
-
Pterobranchia (3)
-
reefs (1)
-
sea water (1)
-
sea-level changes (5)
-
sedimentary rocks
-
carbonate rocks
-
limestone (2)
-
-
clastic rocks
-
black shale (1)
-
mudstone (1)
-
shale (2)
-
-
-
sedimentary structures
-
biogenic structures
-
bioherms
-
mud mounds (1)
-
-
microbial mats
-
cyanobacterial mats (1)
-
-
-
-
sedimentation (3)
-
tectonics (5)
-
United States
-
Alabama (1)
-
Alaska (1)
-
Cincinnati Arch (2)
-
Eastern U.S. (1)
-
Indiana
-
Dearborn County Indiana (1)
-
Franklin County Indiana (1)
-
Jefferson County Indiana (1)
-
-
Iowa
-
Winneshiek County Iowa (1)
-
-
Kentucky
-
Boone County Kentucky (1)
-
Franklin County Kentucky (1)
-
Kenton County Kentucky (1)
-
Mason County Kentucky (1)
-
Trimble County Kentucky (1)
-
-
Maine
-
Aroostook County Maine (1)
-
-
Michigan
-
Michigan Upper Peninsula
-
Delta County Michigan (1)
-
-
-
Minnesota
-
Fillmore County Minnesota (1)
-
Olmsted County Minnesota (1)
-
-
Mississippi Valley
-
Upper Mississippi Valley (1)
-
-
Nevada (1)
-
New England (1)
-
New York
-
Lewis County New York (1)
-
Oneida County New York (2)
-
-
Ohio
-
Clermont County Ohio (2)
-
Hamilton County Ohio
-
Cincinnati Ohio (2)
-
-
-
Oklahoma (1)
-
Virginia (1)
-
Wisconsin
-
Columbia County Wisconsin (1)
-
Dane County Wisconsin (1)
-
Dodge County Wisconsin (1)
-
Grant County Wisconsin (1)
-
Green County Wisconsin (1)
-
-
-
weathering (1)
-
-
sedimentary rocks
-
sedimentary rocks
-
carbonate rocks
-
limestone (2)
-
-
clastic rocks
-
black shale (1)
-
mudstone (1)
-
shale (2)
-
-
-
shell beds (1)
-
siliciclastics (1)
-
-
sedimentary structures
-
borings (2)
-
burrows (1)
-
mounds (2)
-
sedimentary structures
-
biogenic structures
-
bioherms
-
mud mounds (1)
-
-
microbial mats
-
cyanobacterial mats (1)
-
-
-
-
-
sediments
-
shell beds (1)
-
siliciclastics (1)
-
Katian
Paleocommunity composition, relative abundance, and new camerate crinoids from the Brechin Lagerstätte (Upper Ordovician)
Comparisons of Late Ordovician ecosystem dynamics before and after the Richmondian invasion reveal consequences of invasive species in benthic marine paleocommunities
Late Ordovician brachiopods from east-central Alaska, northwestern margin of Laurentia
Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation: REPLY
Early parasitic drilling in a rhynchonelliform brachiopod Rongatrypa xichuanensis from the Katian (Upper Ordovician) of central China
A new method for predicting the shale distribution of the Wufeng Formation in the Upper Yangtze Region, China
Biodiversity, systematics, and new taxa of cladid crinoids from the Ordovician Brechin Lagerstätte
An Ordovician nectocaridid hints at an endocochleate origin of Cephalopoda
Oceanic environment changes caused the Late Ordovician extinction: evidence from geochemical and Nd isotopic composition in the Yangtze area, South China
Paleogeographic and paleoecological significance of Schachriomonia (Brachiopoda) from the Upper Ordovician of the Tarim Basin, Northwest China
A restudy of the Sandbian to Katian (Upper Ordovician) graptolites from the East Qilianshan (Chilianshan), Northwest China
Katian (Upper Ordovician) carbon isotope chemostratigraphy in the Neixiang area, central China: implications for intercontinental correlation
A new cryptostome bryozoan Ptilotrypa from the Upper Ordovician Yong Limestone Formation: Tethyan sequence of Kumaun Higher Himalaya, India
Insight into late Iapetus tectonics from new U–Pb zircon and micropalaeontological data from the Navan area, eastern Ireland
Revised stratigraphy of the middle Simcoe Group (Ordovician, upper Sandbian–Katian) in its type area: an integrated approach
New Ordovician marine macroalgae from North America, with observations on Buthograptus , Callithamnopsis , and Chaetocladus
ABSTRACT Aseismic ridge subduction is common along modern convergent margins. We enumerate six criteria that can be used to recognize aseismic ridge subduction in orogens, including a magmatic gap with uplift followed by bimodal volcanism, which commonly includes explosive, voluminous rhyodacitic volcanism that erupts far from the trench. Features temporally linked with the explosive volcanism include retroarc thrusts and consequent thrust-loaded retroarc foreland basin development. Using these criteria to examine features of the Taconic orogen, together with new stratigraphic and structural data from the Utica basin that constrain the basin subsidence architecture and thrust timing, we propose that at least the older units of the 456–435 Ma Oliverian Plutonic Suite in New England were generated during steepening of the downgoing slab after passage of a subducting aseismic ridge. Weakened crust from delamination and decompression melting promoted westerly directed thrusts (present-day coordinates) that loaded the Taconic retroarc foreland. The resulting Utica basin subsided rapidly and nearly synchronously over an ~150-km-wide region and contains interbedded 453–451 Ma ash layers from the Oliverian Plutonic Suite or coeval plutons to the south. This history of basin subsidence indicates that the major thrust loads that drove development of the Utica basin were emplaced over a similarly brief interval beginning ca. 455 Ma. Thus, the Taconic thrusts, the Utica basin, the volcanic ashes, and the early Oliverian felsic magmatic units could all be related to an aseismic ridge subduction event. Because of the ubiquity of seamount chains, we expect that aseismic ridge subduction affected other segments of the Taconic orogen.