- 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
-
Southern Africa
-
Namibia (1)
-
-
-
Antarctica
-
East Antarctica (1)
-
Transantarctic Mountains (1)
-
Victoria Land (1)
-
-
Canada (2)
-
Europe
-
Baltic region
-
Estonia (1)
-
-
Western Europe
-
Ireland (1)
-
United Kingdom
-
Great Britain
-
Scotland (1)
-
-
-
-
-
North America
-
Appalachian Basin (1)
-
Great Plains (1)
-
Western Interior
-
Western Interior Seaway (1)
-
-
-
United States
-
Indiana (3)
-
Kentucky (3)
-
Montana
-
Beaverhead County Montana (2)
-
Madison County Montana (1)
-
-
Ohio (3)
-
Oklahoma
-
Arbuckle Mountains (1)
-
-
Western U.S. (1)
-
-
-
commodities
-
aggregate (1)
-
-
elements, isotopes
-
carbon
-
C-13/C-12 (1)
-
-
isotope ratios (1)
-
isotopes
-
stable isotopes
-
C-13/C-12 (1)
-
-
-
-
fossils
-
Chordata
-
Vertebrata
-
Pisces
-
Osteichthyes
-
Actinopterygii (1)
-
-
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Perissodactyla
-
Hippomorpha
-
Equidae (2)
-
-
-
-
-
-
-
-
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Branchiopoda (2)
-
Ostracoda
-
Podocopida
-
Cypridocopina
-
Cyprididae
-
Candona (1)
-
-
-
Darwinula (1)
-
-
-
-
-
Trilobitomorpha
-
Trilobita (1)
-
-
-
Brachiopoda
-
Articulata
-
Orthida (1)
-
Rhynchonellida
-
Rhynchonellidae (1)
-
-
-
-
Bryozoa (1)
-
Cnidaria
-
Anthozoa (1)
-
-
Echinodermata
-
Crinozoa
-
Crinoidea (2)
-
-
-
Mollusca
-
Gastropoda (1)
-
-
-
microfossils (2)
-
-
geologic age
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene
-
middle Miocene (1)
-
-
Pliocene (1)
-
-
Paleogene
-
Eocene
-
upper Eocene (1)
-
-
Oligocene
-
lower Oligocene (2)
-
-
Renova Formation (1)
-
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous (1)
-
-
Jurassic
-
Ferrar Group (1)
-
Kirkpatrick Basalt (1)
-
-
-
Paleozoic
-
Cambrian
-
Lower Cambrian (1)
-
-
Devonian
-
Upper Devonian (1)
-
-
Ordovician
-
Middle Ordovician
-
Bromide Formation (1)
-
Simpson Group (1)
-
-
Upper Ordovician
-
Cincinnatian
-
Richmondian (1)
-
-
Katian (1)
-
-
-
-
-
metamorphic rocks
-
turbidite (1)
-
-
Primary terms
-
Africa
-
Southern Africa
-
Namibia (1)
-
-
-
Antarctica
-
East Antarctica (1)
-
Transantarctic Mountains (1)
-
Victoria Land (1)
-
-
biogeography (3)
-
Canada (2)
-
carbon
-
C-13/C-12 (1)
-
-
Cenozoic
-
Tertiary
-
Neogene
-
Miocene
-
middle Miocene (1)
-
-
Pliocene (1)
-
-
Paleogene
-
Eocene
-
upper Eocene (1)
-
-
Oligocene
-
lower Oligocene (2)
-
-
Renova Formation (1)
-
-
-
-
Chordata
-
Vertebrata
-
Pisces
-
Osteichthyes
-
Actinopterygii (1)
-
-
-
Tetrapoda
-
Mammalia
-
Theria
-
Eutheria
-
Perissodactyla
-
Hippomorpha
-
Equidae (2)
-
-
-
-
-
-
-
-
-
climate change (2)
-
data processing (1)
-
diagenesis (1)
-
Europe
-
Baltic region
-
Estonia (1)
-
-
Western Europe
-
Ireland (1)
-
United Kingdom
-
Great Britain
-
Scotland (1)
-
-
-
-
-
Invertebrata
-
Arthropoda
-
Mandibulata
-
Crustacea
-
Branchiopoda (2)
-
Ostracoda
-
Podocopida
-
Cypridocopina
-
Cyprididae
-
Candona (1)
-
-
-
Darwinula (1)
-
-
-
-
-
Trilobitomorpha
-
Trilobita (1)
-
-
-
Brachiopoda
-
Articulata
-
Orthida (1)
-
Rhynchonellida
-
Rhynchonellidae (1)
-
-
-
-
Bryozoa (1)
-
Cnidaria
-
Anthozoa (1)
-
-
Echinodermata
-
Crinozoa
-
Crinoidea (2)
-
-
-
Mollusca
-
Gastropoda (1)
-
-
-
isotopes
-
stable isotopes
-
C-13/C-12 (1)
-
-
-
Mesozoic
-
Cretaceous
-
Upper Cretaceous (1)
-
-
Jurassic
-
Ferrar Group (1)
-
Kirkpatrick Basalt (1)
-
-
-
North America
-
Appalachian Basin (1)
-
Great Plains (1)
-
Western Interior
-
Western Interior Seaway (1)
-
-
-
paleoclimatology (2)
-
paleoecology (7)
-
paleogeography (1)
-
Paleozoic
-
Cambrian
-
Lower Cambrian (1)
-
-
Devonian
-
Upper Devonian (1)
-
-
Ordovician
-
Middle Ordovician
-
Bromide Formation (1)
-
Simpson Group (1)
-
-
Upper Ordovician
-
Cincinnatian
-
Richmondian (1)
-
-
Katian (1)
-
-
-
-
sedimentary rocks
-
carbonate rocks (1)
-
clastic rocks
-
mudstone (1)
-
sandstone (1)
-
siltstone (1)
-
-
-
sedimentary structures
-
planar bedding structures
-
laminations (1)
-
-
-
sedimentation (1)
-
stratigraphy (1)
-
United States
-
Indiana (3)
-
Kentucky (3)
-
Montana
-
Beaverhead County Montana (2)
-
Madison County Montana (1)
-
-
Ohio (3)
-
Oklahoma
-
Arbuckle Mountains (1)
-
-
Western U.S. (1)
-
-
-
rock formations
-
Oil Creek Formation (1)
-
-
sedimentary rocks
-
sedimentary rocks
-
carbonate rocks (1)
-
clastic rocks
-
mudstone (1)
-
sandstone (1)
-
siltstone (1)
-
-
-
siliciclastics (1)
-
turbidite (1)
-
-
sedimentary structures
-
sedimentary structures
-
planar bedding structures
-
laminations (1)
-
-
-
-
sediments
-
siliciclastics (1)
-
turbidite (1)
-
-
soils
-
paleosols (1)
-
Insights for modern invasion ecology from biotic changes of the Clarksville Phase of the Richmondian Invasion (Ordovician, Katian)
Ordovician of the conterminous United States
Abstract The Ordovician rocks of the conterminous United States (US) have a complex history, spanning multiple ancient basins, shifting palaeoclimate and evolving tectonic regimes. The US portion of the palaeocontinent of Laurentia occupied a relatively stable and isolated position around the southern tropics during the Ordovician. In general, Lower Ordovician rocks form a vast autochthonous blanket of fine-grained (tropical) carbonates that covered much of Laurentia, named the ‘Great American Carbonate Bank’. Outboard, ribbon carbonates and graptolitic shales are found in allochthonous fragments of the ancient continental margin. Middle Ordovician strata are more lithologically diverse, including the addition of several regionally distributed sandstones of the inner detrital belt, mostly overlying the Sauk–Tippecanoe unconformity. Upper Ordovician strata show the greatest lithologic and faunal diversity, reflecting steepening topography resulting from regional compression along the south Laurentian (Appalachian) margin. Recent advances in the interpretation of the US Ordovician come primarily from studies of carbon and oxygen stable isotopes, sequence stratigraphy, palaeoecology, tephrochronology, redox geochemistry, strontium isotopes and geochronology.
Abstract Owing to the increasing availability of data for many fossil groups and a generally accepted palaeogeographical configuration, palaeontologists have been able to develop progressively more robust palaeobiogeographical scenarios for the spatial distributions of Ordovician marine faunas. However, most research in Early Paleozoic palaeobiogeography centres on data derived from extensively studied localities in North America and Europe. Thus, clear patterns are emerging of regional biogeography for these areas. However, the fragmentary nature of data from other regions hinders the development of a detailed understanding of palaeogeographical schemes of many clades at the global level. Provincial patterns are now available for several fossil groups, but the global coverage remains generally fragmentary. Palaeobiogeographical investigations were traditionally focused on better understanding of palaeogeographical scenarios and often employed quantitative analyses of faunal similarity. More recently palaeobiogeographical analyses have expanded to investigate questions such as the location and pace of speciation and macroevolution together with macroecological change. For example, studies on the evolution of speciation levels in the frame of the taxonomic radiation of the Great Ordovician Biodiversification are now available. Future investigations, including modelling, will provide more integrative, global patterns of provincialism, including the location of Ordovician biodiversity hotspots and the recognition of latitudinal diversity gradients.
PALEOECOLOGICAL ASPECTS OF WESTERN UNITED STATES NONMARINE OSTRACODS DURING THE EOCENE–OLIGOCENE TRANSITION: THE EARLY OLIGOCENE FAUNAS OF THE RENOVA FORMATION, SOUTHWESTERN MONTANA
Response by Alycia L. Stigall for the presentation of the 2016 Schuchert Award of the Paleontological Society
The first Cenozoic spinicaudatans from North America
A combined morphometric and phylogenetic revision of the Late Ordovician brachiopod genera Eochonetes and Thaerodonta
Synchronous diversification of Laurentian and Baltic rhynchonelliform brachiopods: Implications for regional versus global triggers of the Great Ordovician Biodiversification Event
Pedogenic mud aggregates and sedimentation patterns between basalt flows (Jurassic Kalkrand Formation, Namibia)
Short-term sediment accumulation directly on basalt flows without the damming of drainage is not well studied. Can lakes form on basalt surfaces during times of volcanic quiescence between outpourings? Large faulted downthrown blocks of the lower Jurassic Kalkrand basalt within the Hardap Recreational Resort in central Namibia provided depressions for sediment accumulation during two periods of volcanic quiescence. The sedimentary infill was preserved as two sedimentary interlayers from 6 to 8 m in thickness between lava flow units. These sedimentary rocks, formerly interpreted as dominantly lacustrine deposits, now can be recognized as alluvial fill because of the presence of pedogenic mud aggregates. Sedimentation processes filling these fault-bound depressions included sheetflooding and grain flow, archived in successions containing sandstone, siltstone, and mudrock. Large cracks and fractures on the basalt surfaces, filled with quartz sandstone, showed that the regional water table was below the basalt flow surface, making the formation of lakes impossible, especially because of the permeability and porosity of such flows in general. No pattern or cyclicity during sediment deposition was found and paleocurrent measurements showed random sedimentary influx directions, probably related to the lava field surface topography. Autochthonous weathering of basalts added to the allochthonous drainage input of quartz-rich sand and silt that produced sandstone and siltstone containing smectitic clays. Most of these clay-rich siltstones and sandstones contained mud laminae within traction-load sedimentary structures, providing evidence for the presence of pedogenic mud aggregates within these sheetflood deposits. Geothermal groundwaters circulating through the basalt and the sediments, mixing with meteoric waters, produced Ca-rich diagenetic waters with an elevated temperature to precipitate calcite cement and dendritic crystals. This work demonstrates that characteristics of mud deposition can provide important clues in determining the true depositional paleoenvironment of these Jurassic sedimentary interlayers between basalt flows.