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Invertebrata
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Tertiary
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Paleogene
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Mesozoic
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Vaca Muerta Formation (2)
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Paleozoic
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Carboniferous
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Virgilian (1)
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Catskill Formation (2)
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Huron Member (1)
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Utica Shale (3)
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Permian
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Road River Formation (1)
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Lower Silurian
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upper Paleozoic (1)
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Primary terms
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absolute age (6)
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Arctic region
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Asia
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Far East
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China
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Ordos Basin (1)
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Yunnan China (1)
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Japan
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Honshu
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Hakusan (1)
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Mongolia (1)
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Middle East (1)
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Atlantic Ocean
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North Atlantic
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Caribbean Sea
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Cariaco Basin (1)
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Ontario
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Grey County Ontario (1)
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Richardson Mountains (1)
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Western Canada
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Alberta
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Peace River Arch (1)
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British Columbia (3)
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Canadian Rocky Mountains (2)
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Yukon Territory (1)
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carbon
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C-13/C-12 (9)
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C-14 (2)
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organic carbon (1)
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Caribbean region
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West Indies
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Antilles
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Lesser Antilles
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Trinidad and Tobago
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Trinidad (1)
-
-
-
-
-
-
Cenozoic
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Quaternary
-
Holocene
-
lower Holocene (1)
-
-
Pleistocene
-
Lake Agassiz (1)
-
upper Pleistocene
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Lake Iroquois (1)
-
Weichselian
-
upper Weichselian
-
Allerod (1)
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Bolling (1)
-
Younger Dryas (1)
-
-
-
Wisconsinan
-
upper Wisconsinan (1)
-
-
-
-
-
Tertiary
-
Neogene
-
Miocene (1)
-
-
Paleogene
-
Eocene (1)
-
-
-
-
Chordata
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Vertebrata
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Tetrapoda (1)
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continental drift (1)
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Southern Europe
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Western Europe
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England
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inclusions
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Invertebrata
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Ptychopariida (1)
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Brachiopoda
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Articulata
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Pentamerida (1)
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Cnidaria
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Anthozoa
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Zoantharia
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Tabulata (1)
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Hydrozoa (1)
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Echinodermata
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Mollusca
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Bivalvia (1)
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Cephalopoda
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Ammonoidea (2)
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Nautiloidea (1)
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Gastropoda (1)
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Porifera
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Stromatoporoidea (1)
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Protista
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Foraminifera (1)
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Radiolaria (1)
-
-
-
isotopes
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radioactive isotopes
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Be-10 (1)
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C-14 (2)
-
-
stable isotopes
-
C-13/C-12 (9)
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D/H (2)
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N-15/N-14 (1)
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O-18/O-16 (1)
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S-34/S-32 (2)
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Sr-87/Sr-86 (1)
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land subsidence (2)
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land use (1)
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lineation (2)
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Mediterranean Sea
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East Mediterranean
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Black Sea (1)
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Mesozoic
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Cretaceous
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GeoRef Categories
Era and Period
Epoch and Age
Book Series
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Geneseo Formation
Sediment transport processes and lateral facies gradients across a muddy shelf: Examples from the Geneseo Formation of central New York, United States
Abstract The Middle Devonian Geneseo Formation and its lateral equivalents in the Northern Appalachian Basin are regarded as crucial secondary targets to the extensively explored Marcellus subgroup. High-resolution sedimentology, stratigraphy, and petrography have yielded differentiation of genetically related packages, comprised of distinct lithofacies with characteristic physical, biological, and chemical attributes. In addition, argon ion milling and nanoscale scanning electron microscopy of shale sections has shown that the pore structure of the Geneseo derives from pores defined by phyllosilicate frameworks, carbonate dissolution, and within organic matter. Intervals of silt-rich mudstones and muddy siltstones occur in multiple facies types and “interrupt” facies, reflecting background sedimentation. These deposits and their sedimentary features are interpreted as products of high-density fluvial discharge events. Pore morphology and distribution correlates with distinct mudstone lithofacies as a result of small-scale compositional and textural characteristics. Phyllosilicate framework pores are small triangular openings (100-1500 nm wide) and are the dominant pore type observed in hyperpycnites. Organic matter porosity is common (10-500 nm pore size) and dominates the organic-rich facies that represents “background” sedimentation with high organic content. Carbonate dissolution pores (50-500 nm wide) are observed in calcareous intervals and reflect partial dissolution of carbonate grains during catagenetic formation of carboxylic/phenolic acids.
Sedimentary Facies and Depositional Environment of the Middle Devonian Geneseo Formation of New York, U.S.A.
Carbonate concretions in the Geneseo Formation in A) the Cayuga Crushed S...
Stratigraphic column for the Geneseo Formation (Ms, mudstone; Zs, siltstone...
When do black shales tell molybdenum isotope tales?
Abstract A Marcellus-Burket/Geneseo field trip in the Appalachian Valley and Ridge features both brittle and ductile structures. The degree to which these structures have developed depends on both lithology, which is a function of the stratigraphic architecture of the Devonian Appalachian Basin and position relative to the foreland during the Alleghanian Orogeny. Joints are best developed in the black shales and the units immediately above with the J 2 joint set most prominent in the Brallier Formation just above the Burket/Geneseo Formation. Faults are seen in the form of cleavage duplexes and bedding-parallel slip accompanying flexural-slip folding. Cleavage duplexes are found in the Marcellus whereas bedding-parallel slip is more common in the overlying Mahantango Formation and further up the section in the Brallier Formation. Layer-parallel shortening decreases from greater than 50% to approximately 10% when crossing the Jacks Mountain–Berwick Anticline structural front from the hinterland portion to the foreland portion of the Valley and Ridge. Disjunctive cleavage, the primary mechanism for layer-parallel shortening, is best developed in carbonates whereas pencil cleavage is best developed in shales.