Erosional Scour and Geologic Evolution of Croatan Sound, Northeastern North Carolina PDF Download
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Author: Stanley R. Riggs
Publisher:
ISBN:
Category : Coast changes
Languages : en
Pages : 234
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Author: Stanley R. Riggs
Publisher:
ISBN:
Category : Coast changes
Languages : en
Pages : 238
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Author: Peter R. Parham
Publisher:
ISBN:
Category : Croatan Sound (N.C.)
Languages : en
Pages : 278
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Author: Greg L. Rudolph
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ISBN:
Category : Croatan Sound (N.C.)
Languages : en
Pages : 474
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Author: Peter R. Parham
Publisher:
ISBN:
Category : Geological time
Languages : en
Pages : 580
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Author: Sarah Ann Roberts
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 152
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Author: Kelly M. Best
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Category : Barrier islands
Languages : en
Pages : 265
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Foraminiferal, lithologic, chronostratigraphic, and geophysical data were utilized to describe the Quaternary geologic evolution of the Croatan Beach Ridge Complex, Bogue Sound, and Bogue Banks. The Croatan Beach Ridge Complex is a beach ridge feature located on the mainland of Carteret County, NC. It is separated from the adjacent barrier island, Bogue Banks, by Bogue Sound. Seventeen geoprobe and vibracores were collected along four shore-normal and shore-parallel transects from within the beach ridge complex, on the sound side of Bogue Banks, and in Bogue Sound. Seven depositional facies representing various coastal paleoenvironments were identified using sedimentological data and a cluster analysis of foraminiferal samples taken from core material. Three of these depositional facies were determined to be of normal marine salinity (high energy normal marine salinity, low energy normal marine salinity, and shallow inner shelf) and comprise the basal units of the Croatan Beach Ridge Complex, Bogue Banks, and Bogue Sound. The high energy normal marine salinity depositional facies is characterized by Buccella inusitata, Cibicides lobatulus, Elphidium galvestonense, Eponides repandus, Hanzawaia strattoni, Nonionella atlantica, Quinqueloculina spp., and Textularia cf. T. gramen. The low energy normal marine salinity depositional facies is characterized by Bolivina lowmani, Bolivina paula, Eponides repandus, Gavelinopsis praegeri, Quinqueloculina seminula, and Rosalina floridana. The shallow inner shelf depositional facies is characterized by Bolivina lowmani, Buliminella elegantissima, and Quinqueloculina bosciana. The flood tide delta depositional facies contains a diverse foraminiferal assemblage with abundant Elphidium excavatum, Ammonia parkinsoniana, and Elphidium mexicanum and is found in the older sediments underlying Bogue Sound. The high salinity estuary depositional facies, restricted to basal units of Bogue Sound and Bogue Banks, is characterized by Ammonia tepida, Elphidium poeyanum, Haynesina germanica, and Trochammina sp. The high energy back-barrier lagoon depositional facies comprises the modern sediment of Bogue Sound and contains the shelf taxa typical of assemblages South of Cape Hatteras (such as Ammonia cf. A. beccarii and Elphidium gunteri) as well as agglutinated species (Ammotium salsum). Chronostratigraphic data combined with foraminiferal, sedimentological, and geophysical data suggest that the Croatan Beach Ridge Complex formed and prograded south during MIS 5a (~80-95 ka), producing a cape structure at the southern end of the Suffolk Scarp. Similar data suggest aeolian reactivation of the upper segments of the Croatan Beach Ridge Complex during MIS 2 (~18 ka). OSL and radiocarbon age estimates and the occurrence of flood tide delta deposits indicate the formation of Bogue Banks approximately 6 ka. Seaward and westward spit progradation of Bogue Banks began in the Pine Knoll Shores area ca. 1.7 ka and continued to the eastern tip of Salter Path until ca. 1.3 ka. This corresponds to a spit progradation rate of ~16 m/yr, a rate similar to those found at Oregon Inlet. Normal marine salinity conditions were present in Bogue Sound ca. 1.1 ka, suggesting removal of at least the narrowest parts of Bogue Banks, coincident with the collapse of segments of the barrier islands along the Outer Banks.
Author: Andrew Lyman Dietsche
Publisher:
ISBN:
Category :
Languages : en
Pages : 152
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Northern Core Sound is a shallow lagoonal estuary located behind the Outer Banks barrier islands of eastern North Carolina. Thirty-two vibracores and 155 km of chirp and boomer seismic data have been used to define the geologic framework and establish the Holocene evolution of this back-barrier lagoon. Vibracores have been logged for lithology, and sampled to establish the distribution and abundance of foraminifera. The lithostratigraphy and biofacies could not be directly correlated but when related to the seismic data, apparent patterns could be recognized. The Quaternary stratigraphic framework of North Core Sound consists of five depositional sequences, comprising transgressive, highstand, and falling stage systems tracts. Seismic reflections are prominent and are correlated to the sequence stratigraphic surfaces within Pamlico Sound defined by Mallinson et al. (2010). The late Pleistocene paleotopographic surface dips slightly seaward and is characterized by two or three fluvial channels correlating to modern embayments. These channels are separated by a paleotopographic high that extends from Cedar Island seaward. The channels run northeast in the north and southwest in the south creating two different paleo-environments. The paleotopographic high may have contributed to differing foraminiferal assemblages found within Holocene unit. The Holocene unit is characterized by high salinity estuarine deposits dominated by the foraminifera Elphidium excavatum and Ammonia parkinsoniana. Three very similar biofacies were defined with more abundant Ammonia parkinsoniana where salinities may have been slightly lower. Only a salt marsh facies was significantly different. The biofacies may also represent the two paleo-environments illustrated in the seismic data as one is mainly found to the north of the paleotopographic high and the other to the south. Two seismic reflections, H30 and H60, are interpreted as tidal ravinement surfaces and divide the Holocene into three parasequences. Lithologically the units are coarsening upward, which may be a result of the transgressing barrier island (Core Banks) or increased tidal energy related to inlet activity. Radiocarbon age estimates place the lower surface, H30, older than 600 cal y BP, suggesting that this erosional surface is related to the segmentation of the Outer Banks during the Medieval Warm Period or the Little Ice Age, as defined by other workers.
Author: North Carolina. Geological Survey Section
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: David R. Soller
Publisher:
ISBN:
Category : Cape Fear River Valley (N.C.)
Languages : en
Pages : 60
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Author: Thomas P. Moorefield
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 200
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