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Polygon data published by the U.S. Geologic Survey (USGS) to delineate and classify geologic resources, sediment types, and era of deposit. Data was clipped to the extent of Chatham County, GA.
Dataset last edited 2007
Data is static and unchanging
A primary goal of this work is to develop geologic map datasets with standardized structure and attribution. The database design and standards are documented in Chapter A of this series. The intent is that contiguous databases can be merged seamlessly and without any additional effort. In addition to a common database structure, the conterminous U.S. state databases (the contiguous 48 states) have been fitted to a set of standard state boundaries so that, when states are merged, they match without slivers or overlap. No attempt has been made to reconcile differences in mapping across state boundaries.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This report presents the results of the USGS Mineral Resources Program activity to compile a national-scale geologic map database to support national and regional level projects, including mineral resource and geoenvironmental assessments. The only comprehensive sources of regional- and national-scale geologic maps are state geologic maps with scales ranging from 1:100,000 to 1:1,000,000. Digital versions of these state maps form the core of what is presented here. Because no adequate geologic map exists for the state of Alaska, it is being compiled in regional blocks that also form part of this national database. It is expected that this series will completed by approximately the end of 2007. These maps and databases are being released in blocks of states or, in the case of Alaska, as compiled blocks of 1:250,000-scale quadrangles as chapters in this series. For Alaska, formal maps as well as databases are being published here, whereas for the conterminous U.S. only state databases and preview graphics are presented, because published maps for most states already exist. For Alaska these regional compilations will form the base for compiling a new geologic map of the state. As documented in Chapter A, standards for the conterminous U.S. are somewhat different than those for Alaska and Hawaii.</SPAN></P></DIV></DIV></DIV>
U.S. Geologic Survey (USGS)
Mineral Resources Program (MRP)
703-648-6344
geology
geologic
rock
sediment
mineral
age
USGS
<DIV STYLE="text-align:Left;"><DIV><P><SPAN>Available for public download at mrdata.usgs.gov</SPAN></P><P><SPAN>This database is not meant to be used or displayed at any scale other than 1:500,000.</SPAN></P><P><SPAN>Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.</SPAN></P></DIV></DIV>
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