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This feature class contains points that depict the distribution of rock types that are related to the Groundwater Features on the Groundwater Features Map of Chatham County.
Diabase - The red circle points identify a location where a boulder(s) or cobble(s) of the rock type diabase was observed. Diabase is a mafic igneous rock with a composition similar to ocean floor basalts which intruded the Piedmont approximately 200 million years ago. Diabase occurs in narrow, nearly vertical sheets called dikes. The red circle locations mark the surface trace of a diabase dike. Diabase dikes are present as thin (up to 200 feet wide – but more typically are a few feet to 40 feet wide) bodies. Diabase can also occur as sills within the sedimentary rocks of the Triassic basin. Sills are tabular bodies that are oriented generally parallel to the bedding of the Triassic sediments. Diabase dikes are known by groundwater professionals to be good places to install productive groundwater wells in comparison to the surrounding rocks.
Quartz – Quartz is a common rock forming mineral and can be present as gravel- to boulder-sized debris throughout Chatham County. Zones of quartz can form associated with faulting and other geologic environments. In the map area, quartz cobbles and boulders are common. The quartz may be an indication of an area that was faulted in the geologic past and likely has abundant bedrock fractures. Quartz can also occur associated with locations that have undergone hydrothermal alteration. Rocks that show signs of hydrothermal alteration are common in parts of Chatham and adjacent counties. The hydrothermal alteration is the reason there are historic copper mines in the southwest portion of Chatham County. Hydrothermal alteration occurs when water, heated by magma, permeates through rocks or deposits and changes their composition by adding, removing or redistributing chemical elements. Hydrothermal alteration often creates zones of the mineral quartz. Quartz formed during faulting and... |
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This feature class contains points that depict the distribution of rock types that are related to the Groundwater Features on the Groundwater Features Map of Chatham County.
Diabase - The red circle points identify a location where a boulder(s) or cobble(s) of the rock type diabase was observed. Diabase is a mafic igneous rock with a composition similar to ocean floor basalts which intruded the Piedmont approximately 200 million years ago. Diabase occurs in narrow, nearly vertical sheets called dikes. The red circle locations mark the surface trace of a diabase dike. Diabase dikes are present as thin (up to 200 feet wide – but more typically are a few feet to 40 feet wide) bodies. Diabase can also occur as sills within the sedimentary rocks of the Triassic basin. Sills are tabular bodies that are oriented generally parallel to the bedding of the Triassic sediments. Diabase dikes are known by groundwater professionals to be good places to install productive groundwater wells in comparison to the surrounding rocks.
Quartz – Quartz is a common rock forming mineral and can be present as gravel- to boulder-sized debris throughout Chatham County. Zones of quartz can form associated with faulting and other geologic environments. In the map area, quartz cobbles and boulders are common. The quartz may be an indication of an area that was faulted in the geologic past and likely has abundant bedrock fractures. Quartz can also occur associated with locations that have undergone hydrothermal alteration. Rocks that show signs of hydrothermal alteration are common in parts of Chatham and adjacent counties. The hydrothermal alteration is the reason there are historic copper mines in the southwest portion of Chatham County. Hydrothermal alteration occurs when water, heated by magma, permeates through rocks or deposits and changes their composition by adding, removing or redistributing chemical elements. Hydrothermal alteration often creates zones of the mineral quartz. Quartz formed during faulting and... |
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This digital database was prepared by the North Carolina Geological Survey. Bradley, P.J. and Bolich, R.E., 2022, Groundwater features map of Chatham County and surrounding areas, North Carolina: North Carolina Geological Survey Open-file Report 2022-04, scale 1:50,000, in color. |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This feature class contains points that depict the distribution of rock types that are related to the Groundwater Features on the Groundwater Features Map of Chatham County.</SPAN></P><P><SPAN /></P></DIV></DIV></DIV> |
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<DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>Not for use at scales larger than 1:24,000 or at scales larger than the LocationConfidenceMeters field. Refer to field name: LocationConfidenceMeters in each featureclass for numerical value of approximate location confidence. </SPAN></SPAN><SPAN><SPAN>The North Carolina Geological Survey (NCGS) is committed to offering its users accurate, useful, and current information. Although every effort has been made to ensure the accuracy of information it provides, the NCGS shall not be held liable for improper or incorrect use of the data described and/or contained herein. The information contained in these data is dynamic and may change over time. Earlier versions of this data set may exist. The client must be aware of data conditions and bear responsibility for the appropriate use of the information with respect to possible errors, original map scale, collection methodology, currency of data, and other conditions specific to certain data. </SPAN></SPAN></P><P STYLE="margin:0 0 11 0;"><SPAN><SPAN>The NCGS gives no warranty, expressed or implied, as to the accuracy, reliability, or completeness of these data. It is strongly recommended that these data are acquired directly from an NCGS source and not indirectly through other sources which may have modified the data in some way. </SPAN></SPAN></P><P STYLE="margin:0 0 6 0;"><SPAN><SPAN>Although these data have been processed successfully on computer systems at the NCGS, no warranty expressed or implied is made regarding the utility of the data on other systems for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and aggregate use with other data. The use of trade names or commercial products does not constitute their endorsement by the NCGS.</SPAN></SPAN></P><P><SPAN /></P></DIV></DIV></DIV> |
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Groundwater Features Map of Chatham County - Points |
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["Groundwater Features","digital compilation","North Carolina","Chatham County","NC DEQ","DEMLR"] |
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en-US |
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500000 |
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