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These data provide an inventory of colluvial (gravity transport) and alluvial (water transport) deposits in North Carolina. These deposits differ from Landslide Footprints in that they are accumulating very slowly over relatively long periods of time. They generally do not have well defined sources areas. In addition they likely have prehistoric landslide deposits intermixed within. This in many cases leads to the individual deposits containing a multitude of erosional processes (landslides, rainwash, creep, etc.). The data is presented by the North Carolina Geological Survey. Mapping is ongoing. |
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These data provide an inventory of colluvial (gravity transport) and alluvial (water transport) deposits in North Carolina. These deposits differ from Landslide Footprints in that they are accumulating very slowly over relatively long periods of time. They generally do not have well defined sources areas. In addition they likely have prehistoric landslide deposits intermixed within. This in many cases leads to the individual deposits containing a multitude of erosional processes (landslides, rainwash, creep, etc.). The data is presented by the North Carolina Geological Survey. Mapping is ongoing. |
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North Carolina Geological Survey (NCGS) |
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5000 |
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[] |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>These colluvial and alluvial deposits represent the areal extents of significant volumes of earth, debris, and rock fragments that could have accumulated in part because of past debris flows and debris slides and, to a lesser extent, rock falls and rockslides. These colluvial and alluvial deposits indicate areas that can be affected by landslides and can be unstable in some circumstances. The bulk of the deposits are likely prehistoric in age, but their ages have yet to be verified by modern age-dating techniques. Colluvial deposits consist of heterogeneous mixtures of clay, silt, and sand particles with gravel- to boulder-sized rock clasts in various stages of weathering and decomposition. Areas mapped as deposits met two or more of the following criteria: 1) exhibited an elongate, lobate or fan shape, or other landform characteristic of a slope movement deposit, visible at a scale of <1:7,500 using Light Detecting And Ranging (LiDAR) digital elevation model (DEM) derivatives; 2) had an adequate upslope source area where past slope movements could have initiated; 3) were verified in the field to contain gravel- to boulder-sized clasts or other textures and depositional structures that characterize deposits produced by slope movements (i.e. matrix supported or imbricated clasts, or scour and fill structures); and/or contained boulder deposits visible in some recent orthophotography. Many narrow stream valleys likely contain colluvial deposits that are not feasible to map at this scale.</SPAN></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>All users of this electronic data set must read and fully comprehend the metadata prior to use. All electronic and/or hardcopy products (maps, data, and text, etc.) produced by the North Carolina Geological Survey landslide hazard assessment program are considered public information (unless otherwise noted) and may be distributed or copied. When using, distributing or copying this data set as a source, the Originator must be acknowledged. These products are intended to serve for general planning purposes only and are provided on an "as is" basis. This data set shall not be used beyond the limits of the set source scale. This data set does not represent a survey document completed by a licensed land surveyor and should not be utilized as such.</SPAN></P></DIV></DIV></DIV> |
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| title:
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Deposits |
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| tags:
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["geologic hazards","landslides","Blue Ridge","geoscientific Information","Appalachia","landslide deposits","NC","North Carolina","NCGS","North Carolina Geological Survey","DEQ","Department of Environmental Quality"] |
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en-US |
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150000000 |
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