- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
- Abstract
- Affiliation
- All
- Authors
- Book Series
- DOI
- EISBN
- EISSN
- Full Text
- GeoRef ID
- ISBN
- ISSN
- Issue
- Keyword (GeoRef Descriptor)
- Meeting Information
- Report #
- Title
- Volume
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
-
Altai-Sayan region (1)
-
Central Asia
-
Kazakhstan
-
Eastern Kazakhstan
-
Chingis-Tau (1)
-
Semipalatinsk Kazakhstan (1)
-
-
-
-
Far East
-
China
-
Chongqing China (3)
-
Gansu China (1)
-
Guangxi China (1)
-
Guizhou China (1)
-
Henan China (2)
-
Hubei China (1)
-
Hunan China (1)
-
Inner Mongolia China (1)
-
Jiangxi China (1)
-
North China Platform (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)
-
-
-
-
Middle East
-
Iran (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)
-
-
Nipissing District Ontario
-
Brent Crater (1)
-
-
Renfrew County Ontario (1)
-
Simcoe County Ontario (3)
-
-
Quebec
-
Anticosti Island (3)
-
-
-
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)
-
-
-
Russian Federation (1)
-
-
Cornwallis Island (1)
-
Dunnage Zone (1)
-
Europe
-
Baltic region
-
Estonia (3)
-
-
Central Europe
-
Czech Republic
-
Bohemia
-
Prague Basin (1)
-
-
-
Poland
-
Swiety Krzyz Mountains (1)
-
-
-
Southern Europe
-
Iberian Peninsula
-
Central Iberian Zone (1)
-
Portugal (1)
-
Spain
-
Aragon Spain
-
Saragossa Spain (1)
-
-
Iberian Mountains (1)
-
-
-
-
Western Europe
-
France
-
Armorican Massif (1)
-
Finistere France
-
Crozon Peninsula (1)
-
-
-
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)
-
-
Northern Ireland (1)
-
-
-
-
Midlands (1)
-
North America
-
Appalachian Basin (2)
-
Appalachians
-
Northern Appalachians (1)
-
-
Canadian Shield (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 (4)
-
Eastern U.S. (1)
-
Illinois (1)
-
Indiana
-
Dearborn County Indiana (1)
-
Franklin County Indiana (1)
-
Jefferson County Indiana (1)
-
-
Iowa
-
Winneshiek County Iowa (1)
-
-
Kentucky
-
Boone County Kentucky (1)
-
Bracken County Kentucky (1)
-
Franklin County Kentucky (2)
-
Kenton County Kentucky (1)
-
Mason County Kentucky (2)
-
Trimble County Kentucky (1)
-
-
Maine
-
Aroostook County Maine (1)
-
-
Maryland
-
Allegany County Maryland
-
Cumberland Maryland (1)
-
-
-
Michigan
-
Michigan Upper Peninsula
-
Delta County Michigan (1)
-
-
-
Minnesota
-
Fillmore County Minnesota (1)
-
Olmsted County Minnesota (1)
-
-
Mississippi Valley
-
Upper Mississippi Valley (1)
-
-
Missouri (1)
-
Nevada (1)
-
New England (1)
-
New York
-
Lewis County New York (1)
-
Oneida County New York (2)
-
-
Ohio
-
Clermont County Ohio (3)
-
Hamilton County Ohio
-
Cincinnati Ohio (3)
-
-
Highland County Ohio (1)
-
-
Oklahoma (2)
-
Virginia (2)
-
West Virginia (1)
-
Wisconsin
-
Columbia County Wisconsin (1)
-
Dane County Wisconsin (1)
-
Dodge County Wisconsin (1)
-
Grant County Wisconsin (1)
-
-
Wyoming
-
Teton County Wyoming (1)
-
Teton National Forest (1)
-
-
-
-
commodities
-
bitumens (1)
-
petroleum
-
natural gas
-
shale gas (2)
-
-
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (13)
-
-
isotope ratios (15)
-
isotopes
-
stable isotopes
-
C-13/C-12 (13)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (6)
-
Sr-87/Sr-86 (1)
-
-
-
metals
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (1)
-
-
-
mercury (1)
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
oxygen
-
O-18/O-16 (6)
-
-
-
fossils
-
borings (2)
-
burrows (1)
-
Chordata
-
Vertebrata (7)
-
-
Graptolithina
-
Graptoloidea (2)
-
-
Hemichordata (5)
-
ichnofossils
-
Thalassinoides (1)
-
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)
-
-
-
Echinozoa
-
Edrioasteroidea (1)
-
Ophiocistioidea (1)
-
-
Homalozoa
-
Homoiostelea (1)
-
-
-
Mollusca
-
Bivalvia (2)
-
Cephalopoda
-
Nautiloidea (2)
-
-
Gastropoda (3)
-
Monoplacophora (1)
-
Polyplacophora (1)
-
Tentaculitida (1)
-
-
Porifera
-
Stromatoporoidea (1)
-
-
Protista
-
Radiolaria (1)
-
-
Vermes
-
Polychaeta (1)
-
scolecodonts (1)
-
-
-
microfossils
-
Chitinozoa (2)
-
Conodonta (9)
-
problematic microfossils (1)
-
scolecodonts (1)
-
-
palynomorphs
-
acritarchs (2)
-
Chitinozoa (2)
-
-
Plantae
-
algae
-
Chlorophyta (3)
-
-
-
problematic fossils
-
problematic microfossils (1)
-
-
Pterobranchia (4)
-
-
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)
-
Lower Ordovician
-
Floian (1)
-
Tremadocian (1)
-
-
Middle Ordovician
-
Dapingian (1)
-
Darriwilian (1)
-
Deicke Bentonite Bed (1)
-
Millbrig Bentonite Bed (1)
-
Platteville Formation (1)
-
-
Trenton Group (2)
-
Upper Ordovician
-
Bighorn Dolomite (1)
-
Caradocian (1)
-
Cincinnatian
-
Maysvillian (1)
-
Richmondian (1)
-
-
Fairview Formation (5)
-
Hirnantian (10)
-
Juniata Formation (1)
-
Katian (81)
-
Kope Formation (3)
-
Lorraine Group (1)
-
Red River Formation (1)
-
Sandbian (15)
-
Whitewater Formation (1)
-
Wufeng Formation (3)
-
-
Utica Shale (1)
-
Womble Shale (1)
-
-
Silurian
-
Lower Silurian
-
Llandovery
-
Rhuddanian (3)
-
-
-
-
-
-
igneous rocks
-
igneous rocks
-
peperite (1)
-
volcanic rocks
-
basalts (1)
-
pyroclastics
-
tuff (1)
-
-
-
-
ophiolite (1)
-
-
metamorphic rocks
-
K-bentonite (2)
-
metamorphic rocks
-
metasedimentary rocks (1)
-
-
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
-
Altai-Sayan region (1)
-
Central Asia
-
Kazakhstan
-
Eastern Kazakhstan
-
Chingis-Tau (1)
-
Semipalatinsk Kazakhstan (1)
-
-
-
-
Far East
-
China
-
Chongqing China (3)
-
Gansu China (1)
-
Guangxi China (1)
-
Guizhou China (1)
-
Henan China (2)
-
Hubei China (1)
-
Hunan China (1)
-
Inner Mongolia China (1)
-
Jiangxi China (1)
-
North China Platform (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)
-
-
-
-
Middle East
-
Iran (1)
-
-
-
Atlantic Ocean
-
North Atlantic
-
Baltic Sea (1)
-
Hudson Bay (1)
-
Hudson Strait (1)
-
-
-
Australasia
-
Australia
-
New South Wales Australia (1)
-
-
-
biogeography (8)
-
bitumens (1)
-
Canada
-
Eastern Canada
-
Baffin Island (2)
-
Newfoundland and Labrador
-
Newfoundland (1)
-
-
Ontario
-
Manitoulin District Ontario
-
Manitoulin Island (2)
-
-
Nipissing District Ontario
-
Brent Crater (1)
-
-
Renfrew County Ontario (1)
-
Simcoe County Ontario (3)
-
-
Quebec
-
Anticosti Island (3)
-
-
-
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 (13)
-
-
Chordata
-
Vertebrata (7)
-
-
climate change (4)
-
crystal chemistry (1)
-
data processing (1)
-
deformation (1)
-
diagenesis (2)
-
ecology (1)
-
Europe
-
Baltic region
-
Estonia (3)
-
-
Central Europe
-
Czech Republic
-
Bohemia
-
Prague Basin (1)
-
-
-
Poland
-
Swiety Krzyz Mountains (1)
-
-
-
Southern Europe
-
Iberian Peninsula
-
Central Iberian Zone (1)
-
Portugal (1)
-
Spain
-
Aragon Spain
-
Saragossa Spain (1)
-
-
Iberian Mountains (1)
-
-
-
-
Western Europe
-
France
-
Armorican Massif (1)
-
Finistere France
-
Crozon Peninsula (1)
-
-
-
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)
-
-
Northern Ireland (1)
-
-
-
-
geochemistry (2)
-
glacial geology (1)
-
Graptolithina
-
Graptoloidea (2)
-
-
Hemichordata (5)
-
ichnofossils
-
Thalassinoides (1)
-
Trypanites (2)
-
-
igneous rocks
-
peperite (1)
-
volcanic rocks
-
basalts (1)
-
pyroclastics
-
tuff (1)
-
-
-
-
inclusions (1)
-
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)
-
-
-
Echinozoa
-
Edrioasteroidea (1)
-
Ophiocistioidea (1)
-
-
Homalozoa
-
Homoiostelea (1)
-
-
-
Mollusca
-
Bivalvia (2)
-
Cephalopoda
-
Nautiloidea (2)
-
-
Gastropoda (3)
-
Monoplacophora (1)
-
Polyplacophora (1)
-
Tentaculitida (1)
-
-
Porifera
-
Stromatoporoidea (1)
-
-
Protista
-
Radiolaria (1)
-
-
Vermes
-
Polychaeta (1)
-
scolecodonts (1)
-
-
-
isotopes
-
stable isotopes
-
C-13/C-12 (13)
-
Nd-144/Nd-143 (1)
-
O-18/O-16 (6)
-
Sr-87/Sr-86 (1)
-
-
-
lava (1)
-
metals
-
alkaline earth metals
-
strontium
-
Sr-87/Sr-86 (1)
-
-
-
mercury (1)
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
metamorphic rocks
-
metasedimentary rocks (1)
-
-
metasomatism (1)
-
museums (1)
-
North America
-
Appalachian Basin (2)
-
Appalachians
-
Northern Appalachians (1)
-
-
Canadian Shield (1)
-
-
oxygen
-
O-18/O-16 (6)
-
-
Pacific Ocean
-
North Pacific
-
Northwest Pacific
-
Celebes Sea (1)
-
-
-
West Pacific
-
Indonesian Seas
-
Celebes Sea (1)
-
-
Northwest Pacific
-
Celebes Sea (1)
-
-
-
-
paleoclimatology (7)
-
paleoecology (21)
-
paleogeography (10)
-
Paleozoic
-
Cambrian (1)
-
Devonian (1)
-
Ellis Bay Formation (1)
-
lower Paleozoic
-
Cape Phillips Formation (1)
-
-
Ordovician
-
Lexington Limestone (1)
-
Lower Ordovician
-
Floian (1)
-
Tremadocian (1)
-
-
Middle Ordovician
-
Dapingian (1)
-
Darriwilian (1)
-
Deicke Bentonite Bed (1)
-
Millbrig Bentonite Bed (1)
-
Platteville Formation (1)
-
-
Trenton Group (2)
-
Upper Ordovician
-
Bighorn Dolomite (1)
-
Caradocian (1)
-
Cincinnatian
-
Maysvillian (1)
-
Richmondian (1)
-
-
Fairview Formation (5)
-
Hirnantian (10)
-
Juniata Formation (1)
-
Katian (81)
-
Kope Formation (3)
-
Lorraine Group (1)
-
Red River Formation (1)
-
Sandbian (15)
-
Whitewater Formation (1)
-
Wufeng Formation (3)
-
-
Utica Shale (1)
-
Womble Shale (1)
-
-
Silurian
-
Lower Silurian
-
Llandovery
-
Rhuddanian (3)
-
-
-
-
-
palynomorphs
-
acritarchs (2)
-
Chitinozoa (2)
-
-
petroleum
-
natural gas
-
shale gas (2)
-
-
-
Plantae
-
algae
-
Chlorophyta (3)
-
-
-
plate tectonics (2)
-
problematic fossils
-
problematic microfossils (1)
-
-
Pterobranchia (4)
-
reefs (1)
-
sea water (1)
-
sea-level changes (8)
-
sedimentary rocks
-
carbonate rocks
-
limestone
-
microbialite (1)
-
-
-
clastic rocks
-
black shale (1)
-
mudstone (1)
-
shale (2)
-
-
-
sedimentary structures
-
biogenic structures
-
bioherms
-
mud mounds (1)
-
-
microbial mats
-
cyanobacterial mats (1)
-
-
-
-
sedimentation (3)
-
stratigraphy (1)
-
tectonics (6)
-
United States
-
Alabama (1)
-
Alaska (1)
-
Cincinnati Arch (4)
-
Eastern U.S. (1)
-
Illinois (1)
-
Indiana
-
Dearborn County Indiana (1)
-
Franklin County Indiana (1)
-
Jefferson County Indiana (1)
-
-
Iowa
-
Winneshiek County Iowa (1)
-
-
Kentucky
-
Boone County Kentucky (1)
-
Bracken County Kentucky (1)
-
Franklin County Kentucky (2)
-
Kenton County Kentucky (1)
-
Mason County Kentucky (2)
-
Trimble County Kentucky (1)
-
-
Maine
-
Aroostook County Maine (1)
-
-
Maryland
-
Allegany County Maryland
-
Cumberland Maryland (1)
-
-
-
Michigan
-
Michigan Upper Peninsula
-
Delta County Michigan (1)
-
-
-
Minnesota
-
Fillmore County Minnesota (1)
-
Olmsted County Minnesota (1)
-
-
Mississippi Valley
-
Upper Mississippi Valley (1)
-
-
Missouri (1)
-
Nevada (1)
-
New England (1)
-
New York
-
Lewis County New York (1)
-
Oneida County New York (2)
-
-
Ohio
-
Clermont County Ohio (3)
-
Hamilton County Ohio
-
Cincinnati Ohio (3)
-
-
Highland County Ohio (1)
-
-
Oklahoma (2)
-
Virginia (2)
-
West Virginia (1)
-
Wisconsin
-
Columbia County Wisconsin (1)
-
Dane County Wisconsin (1)
-
Dodge County Wisconsin (1)
-
Grant County Wisconsin (1)
-
-
Wyoming
-
Teton County Wyoming (1)
-
Teton National Forest (1)
-
-
-
weathering (1)
-
-
sedimentary rocks
-
sedimentary rocks
-
carbonate rocks
-
limestone
-
microbialite (1)
-
-
-
clastic rocks
-
black shale (1)
-
mudstone (1)
-
shale (2)
-
-
-
shell beds (1)
-
siliciclastics (1)
-
volcaniclastics (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)
-
volcaniclastics (1)
-
Katian
Katian volcanism in Central Armorican Domain (France) and Central Iberian Zone (Portugal): a single monogenetic basaltic field?
The influence of Late Ordovician volcanism on the marine environment based on high-resolution mercury data from South China
A new marrellomorph arthropod from southern Ontario: a rare case of soft-tissue preservation on a Late Ordovician open marine shelf
TAPHONOMIC CONTROLS ON MICROBIALITE TEXTURES FROM THE STEAMBOAT POINT MEMBER, UPPER ORDOVICIAN BIGHORN DOLOMITE, WESTERN TETON MOUNTAINS, USA
Diverse labechiid stromatoporoids from the Upper Ordovician Xiazhen Formation of South China and their paleobiogeographic implications
Reassessment of ocean paleotemperatures during the Late Ordovician
A possible Laurentian volchoviid ophiocistioid from the Katian of southwestern Ohio
Precession-driven climate cycles and time scale prior to the Hirnantian glacial maximum
Katian (Late Ordovician) conodonts on the northwestern margin of the North China Craton
Spiracarneyella , a new carneyellid edrioasteroid from the Upper Ordovician (Katian) of Kentucky and Ohio and comments on carneyellid heterochrony
Preliminary palynological study of the Upper Ordovician Pin Formation in northern Indian Himalaya
Eustatic and local tectonic impact on the Late Ordovician – early Silurian facies evolution on the SW margin of peri-Baltica (the southern Holy Cross Mountains, Poland)
Paleocommunity composition, relative abundance, and new camerate crinoids from the Brechin Lagerstätte (Upper Ordovician)
Colonial palynomorphs from the Upper Ordovician of north-eastern Iran: ‘thalli’, coenobial Chlorophyceae (Hydrodictyaceae) or cyanobacteria?
ABSTRACT The Upper Ordovician Juniata Formation, Central Appalachian Basin, USA, is a thick succession of cyclically bedded arenites, wackes, and mudrocks. Sedimentary facies of the formation in West Virginia, Virginia, and Maryland indicate cyclic peritidal deposition along the northern shoreline of the basin. The subsurface Juniata Formation has been drilled throughout the basin, and long, continuous well logs are available for analysis of the cyclic deposition. A 2400-ft-long (731.52-m-long) gamma-ray (GR) log from the Preston 119 well, northern West Virginia, provides a proxy of terrigenous siliciclastic fluxes originating from the Taconic highlands, from the early Ashgillian to the Ordovician–Silurian transition. Strong cycling in the GR log shows evidence for Milankovitch-forced sea-level oscillations, hypothesized to have been produced by dynamic Late Ordovician glaciation in polar (southern) Gondwana. Juniata cycle frequencies are different from those of Quaternary Milankovitch cycles, with significantly higher obliquity and precession index frequencies, consistent with a 21.5 h Ordovician day and an Earth-Moon distance that was 95% of present day. These results support John Dennison’s long-held view that Milankovitch forcing of sedimentation took place in the early Paleozoic Appalachian Basin by action of remotely generated glacio-eustatic oscillations powered by glaciation on southern Gondwana, and that this sedimentary record has tracked “Earth’s movement through space.”