Blue Ridge Front—a Fault Scarp

White, William A.

doi:10.1130/0016-7606(1950)61[1309:brffs]2.0.co;2

Cited by 24 publications

(26 citation statements)

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“…The initial BRE topography almost certainly formed well seaward of its present location, and quartz mylonite clasts in terraces B and E (Fig. 3A) indicate the Brevard/Bowens Creek fault zone was a drainage-controlling feature atop the Upland and did not reactivate to initiate the BRE as suggested by White (1950). This idea is further supported by fluvial evidence of retreat atop the ECD and BRE where it is located well seaward of the Brevard Zone in western North Carolina (Fig.…”

Section: Discussionsupporting

confidence: 52%

“…The BRE has long been viewed as a feature shaped by erosional retreat related to the asymmetry of the divide (Davis, 1903;Wright, 1927;White, 1950;Dietrich, 1957Dietrich, , 1959Harbor, 1996) but has seldom been regarded as a great escarpment produced by rift-flank uplift (e.g., Ollier, 1984;Tucker and Slingerland, 1994). Pazzaglia and Gardner (2000) suggested that the BRE is a great escarpment that was excavated from a fixed inland divide after Mesozoic rifting and base level drop.…”

Section: The Blue Ridge Escarpmentmentioning

confidence: 98%

“…Other hypotheses for its origin have favored active tectonic or geodynamic origins. White (1950) proposed that normal-sense reactivation of the nearby Brevard/Bowens Creek fault zone produced the escarpment. Numerous workers have cited isostatic rebound related to thickened Appalachian crust or flexural response to offshore sediment loading as drivers of BRE formation and evolution (Wright, 1927;Pratt et al, 1988;Battiau-Queney, 1989;Hubbard et al, 1991;Pazzaglia and Brandon, 1996;Pazzaglia and Gardner, 2000).…”

Section: The Blue Ridge Escarpmentmentioning

confidence: 99%

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New physical evidence of the role of stream capture in active retreat of the Blue Ridge escarpment, southern Appalachians

2010

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Section: Discussionsupporting

confidence: 52%

Section: The Blue Ridge Escarpmentmentioning

confidence: 98%

Section: The Blue Ridge Escarpmentmentioning

confidence: 99%

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New physical evidence of the role of stream capture in active retreat of the Blue Ridge escarpment, southern Appalachians

2010

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“…This pattern is likely a result of the relatively youthful intrusion of the Toxaway River into the Blue Ridge escarpment (White 1950), which is itself a result of headward migration in the Savannah River basin as a whole. Waterfalls delineate the boundaries of these discontinuous assemblages by preventing upstream movements of fish; distributional patterns suggest that these barriers have been in place since the uplift and subsequent erosion of some southern Appalachian streams, and corresponding invasions by stream fishes.…”

Section: Discussionmentioning

confidence: 99%

“…1). These features have created a landscape shaped by processes of erosion, including stream capture and head-cutting (White 1950). This is the smallest major watershed in North Carolina, with a total area of 391 km 2 .…”

Section: Study Areamentioning

confidence: 99%

Discontinuity in fish assemblages across an elevation gradient in a southern Appalachian watershed, USA

Robinson

Rand

2005

Ecology of Freshwater Fish

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Discontinuity in fish assemblages across an elevation gradient in a southern Appalachian watershed, USA Un resumen en españ ol se incluye detrás del texto principal de este artículo.Abstract -We examine patterns in fish species assemblages in the Toxaway and Horsepasture rivers, two high elevation streams in North Carolina, USA. This region is noted for extreme topographical relief, high cumulative annual rainfall and many rare and endemic plants and animals. The study area encompasses a portion of the Blue Ridge Escarpment and the associated Brevard Fault Zone. We hypothesise that major waterfalls and cascade complexes have acted to limit invasion and colonisation by fishes from downstream. This hypothesis is supported by longitudinal fish assemblage patterns in our study streams. Fish species richness in Toxaway River increased from 4 to 23 between Lake Toxaway and Lake Jocassee, a distance of 10 river km. We found similar discontinuities in neighbouring Horsepasture River and Bearwallow Creek. We found no instances of species replacement along this elevation gradient, and the trend in increased diversity downstream showed discontinuities coincident with sharp elevation breaks. With regard to theories posited to explain community formation in headwater stream fish communities (especially in those characterised by high topographical relief), we suggest coloniser 'access' may be more important than other factors including competitive interactions.

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Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic ¹⁰Be

Linari

Bierman

Portenga

et al. 2016

Earth Surf Processes Landf

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The Blue Ridge escarpment, located within the southern Appalachian Mountains of Virginia and North Carolina, forms a distinct, steep boundary between the lower‐elevation Piedmont and higher‐elevation Blue Ridge physiographic provinces. To understand better the rate at which this landform and the adjacent landscape are changing, we measured cosmogenic beryllium‐10 (10Be) in quartz separated from sediment samples (n = 50) collected in 32 streams and from three exposed bedrock outcrops along four transects normal to the escarpment, allowing us to calculate erosion rates integrated over 104–105 years. These basin‐averaged erosion rates (5.4–49 m Myr−1) are consistent with those measured elsewhere in the southern Appalachain Mountains and show a positive relationship between erosion rate and average basin slope. Erosion rates show no relationship with basin size or relative position of the Brevard fault zone, a fundamental structural element of the region. The cosmogenic isotopic data, when considered along with the distribution of average basin slopes in each physiographic province, suggest that the escarpment is eroding on average more rapidly than the Blue Ridge uplands, which are eroding more rapidly than the Piedmont lowlands. This difference in erosion rates by geomorphic setting suggests that the elevation difference between the uplands and lowlands adjacent to the escarpment is being reduced but at extremely slow rates. Copyright © 2016 John Wiley & Sons, Ltd.

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Blue Ridge Front—a Fault Scarp

Cited by 24 publications

References 0 publications

New physical evidence of the role of stream capture in active retreat of the Blue Ridge escarpment, southern Appalachians

New physical evidence of the role of stream capture in active retreat of the Blue Ridge escarpment, southern Appalachians

Discontinuity in fish assemblages across an elevation gradient in a southern Appalachian watershed, USA

Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic ¹⁰Be

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Blue Ridge Front—a Fault Scarp

Cited by 24 publications

References 0 publications

New physical evidence of the role of stream capture in active retreat of the Blue Ridge escarpment, southern Appalachians

New physical evidence of the role of stream capture in active retreat of the Blue Ridge escarpment, southern Appalachians

Discontinuity in fish assemblages across an elevation gradient in a southern Appalachian watershed, USA

Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic 10Be

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Rates of erosion and landscape change along the Blue Ridge escarpment, southern Appalachian Mountains, estimated from in situ cosmogenic ¹⁰Be