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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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sulfides
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Primary terms
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absolute age (16)
-
Africa
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Afar (1)
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Southern Africa
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South Africa
-
Bushveld Complex (1)
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Merensky Reef (1)
-
-
-
-
Arctic Ocean
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Norwegian Sea
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Jan Mayen Ridge (1)
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-
Asia
-
Altai Mountains (1)
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Far East
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China
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Xinjiang China
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Junggar Basin (1)
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Atlantic Ocean
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biogeography (1)
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Canada
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carbon
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Cenozoic
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Cordilleran ice sheet (1)
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-
upper Pleistocene
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Wisconsinan
-
upper Wisconsinan
-
Fraser Glaciation (1)
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-
-
-
-
-
Tertiary
-
Neogene
-
Miocene
-
Columbia River Basalt Group (1)
-
-
-
Paleogene
-
Eocene (1)
-
Paleocene
-
Clayton Formation (1)
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lower Paleocene
-
Danian (1)
-
-
upper Paleocene
-
Thanetian (1)
-
-
-
Wasatch Formation (1)
-
-
-
-
Chordata
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Vertebrata
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Tetrapoda
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Mammalia (1)
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Reptilia
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Testudines
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Testudinidae (1)
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clay mineralogy (2)
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granites
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Rockport area
Demarcation of a Duplex Zone: Rockport Lake Area, Utah: ABSTRACT
Patterns of Cretaceous shallow-marine sedimentation, Coalville and Rockport areas, Utah
—Bottom topography and locality names, Rockport area. Bay contour interval ...
—Sediment distribution, Rockport area, based on percentages of sand-silt-cl...
—Distribution of low-salinity reefs in Rockport area, illustrated by long, ...
—Showing locations of samples in Rockport area (see also Fig. 2 ). General...
—Sediment distribution in Rockport area bays based on sand-silt-clay conten...
—Environments of deposition in Rockport area based largely on coarse-fracti...
—Minor internal structures in cores of Rockport area. In part related to ef...
—Facies of Foraminifera in Rockport area. Other organisms show similar faci...
—Percentage of carbonate of samples in Rockport area based on gasometric an...
—Location of borings in Rockport area.
—Environments in Rockport area along Texas coast as indicated by coarse-fra...
—Generalized map of Coalville and Rockport areas. Outcrop area of Frontier ...
Sedimentary Patterns of Microfaunas in Northern Gulf of Mexico
Abstract The planktonic foraminiferal fauna in the Gulf of Mexico is composed of mixed mid- and low-latitude species; the mid-latitude forms may be relict from the last glacial stage. Planktonic Foraminifera are characteristic of offshore water; they are rare on the inner continental shelf in this area; apparent depth zonation in the continental shelf sediments is due to frequency distributions. The Holocene planktonic assemblage is underlain by a mid-latitude assemblage of glacial age. The benthonic faunas of the marginal marine environments, including marsh, lagoon, and beach, are delineated and are related to the known general characteristics of the environments. Distinctive faunas associated with deltas are fluvial marine, found in the Mississippi estuary, and deltaic marine or deltaic lagoonal. The best-known patterns of Foraminifera in the open ocean are associated with depth. Faunas of the following environments can be easily recognized—turbulent zone, 0–10 fathoms (0–18 m); inner continental shelf, 0–30 fathoms (0–55 m); outer continental shelf, 30–60 fathoms (55–110 m); upper continental slope, 60–500 fathoms (110–910 m); and lower continental slope and deep sea, deeper than 500 fathoms (910 m). It is not possible to evaluate single ecologic factors causing these patterns, but they can be discussed in general terms. Range of variation in the environmental features is an important general concept. Ecologically distinctive nearshore water masses are formed by varying amounts of runoff. The continental shelf in the Gulf of Mexico is overlain by the seasonal layer; the permanent thermocline water is on the upper continental slope; and the deep water is below 500 fathoms (910 m). Marginal marine biofacies of Ostracoda in the Rockport and Mississippi Delta areas have patterns similar to the foraminiferal biofacies. Rates of deposition based upon live-total populations of Foraminifera correlate well with depth changes in the eastern Mississippi Delta. Low sedimentation rates are indicated for the lower portion of the Rockport area lagoons and high sedimentation rates for Mississippi Sound and Mobile Bay. The northeastern Gulf of Mexico continental shelf appears to be receiving little sediment; rates are high near the Mississippi Delta; and appreciable deposition is occurring only on the inner part of the northwest shelf. The amount of Holocene sedimentation on the continental slope and in the deep sea is based on thickness of the beds containing modern planktonic foraminiferal fauna. In the northwest there is more than 150 centimeters of Holocene sediment on the upper slope, with a decrease to about 100 centimeters at depths greater than 1,000 fathoms (1,829 m). In the central area few cores penetrated the modern fauna and there is more than 200 centimeters of Holocene sediment at depths less than 1,000 fathoms (1,829 m), but sediment in the deep basin is not significantly thicker than that in the west. There is relatively thin Holocene sediment on the upper continental slope in the eastern sector; thicker deposits are found on the lower slope and basin.
Macro-Invertebrate Assemblages of Central Texas Coastal Bays and Laguna Madre
Central Texas Coast Sedimentation: Characteristics of Sedimentary Environment, Recent History, and Diagenesis: PART 1
—From Swain (1955), showing characteristic ostracods in several environment...
—Compilation by M. N. Bramlette, showing Quaternary deposits of Rockport ar...
Abstract Laguna Madre is a linear coastal lagoon, developed on the pre-Holocene 3 3 Throughout the paper the age of transgressive de posits following the last glaciation is referred to as “Holocene,” in keeping with its generally accepted usage. erosion surface by the buildup of a barrier island, resulting from the transgression brought about during the postglacial rise in sea level. The Holocene deposits average 10-20 feet in thickness, although local depressions in the pre-Holocene surface may contain a considerably thicker section. The bulk of the Holocene deposits consists of subgraywacke and subarkosic sand. Local concentrations, however, include limestones, gravels, oolites, and relatively pure clays. Source of the clay is unknown, but heavy and light mineral analyses of the sand fraction indicate locally reworked earlier deposits. The northern Laguna sediments are derived from the pre-Holocene sediments off the Nueces delta province and the southern Laguna sediments are derived from the Holocene and pre-Holocene deposits of the Rio Grande distributary province. The immediate source of the lagoonal fill is the barrier island sand, which is believed to be derived from the earlier deposits of the nearshore gulf. During and after sea-level rise, the near-shore gulf floor was actively eroded by wave action to establish an equilibrium profile. The eroded material was sorted and the sand fraction was transported landward. Wind action piled the new beach sands into coastal dunes on the barrier. Where the earlier deposits were relatively un-consolidated, as offshore northern Padre Island, thick dune deposits could form because of large supply. Where the earlier deposits were more consolidated, and consequently less easily eroded, as in the vicinity of the Rio Grande delta, the dunes are lower and the barrier narrower. Subsequent to the formation of the lagoon about 5,000 years ago, partial filling was accomplished by washover storm waves, wind transport, and tidal activity.