AREA PERIMETER FRCT# FRCT-ID DEP_TYPE SYMBOL AREA PERIMETER BOG# BOG-ID DEP_TYPE SYMBOLThe FRCT coverage contains all contact lines and label points for each polygon related to the ferricrete data, and the BOG coverage contains all contact lines and label points for each polygon related to the bogs and springs data. The FRCT.PAT and BOG.PAT INFO files have the non-common attribute field for DEP_TYPE. DEP_TYPE is a text field that describes each deposit type polygon and each poly line. Two shapefiles each comprise the ferricrete and bogs and springs features. The ferricrete poly and arc features are included in the "frct.shp" and "frcta.shp" shapefiles, respectively. The bog and spring features are included in the bog.shp and boga.shp shapefiles, respectively.
af Alluvial ferricrete cf Colluvial ferricrete uf Undifferentiated ferricrete mncf Colluvial manganocrete mnaf Alluvial manganocrete tf Transitional colluvial manganocrete and ferricrete bi Bog ironThe INFO files BOG.PAT and BOG.AAT have populated attribute fields for item DEP_TYPE and SYMBOL. The INFO items DEP_TYPE and SYMBOL are populated with corresponding text that identifies each unique mapped deposit type and its corresponding map symbol. These bog and spring DEP_TYPE and corresponding SYMBOL attributes are as follows.
sb Sedge bog spi Iron spring ib Iron bog ub Undifferentiated bog
D.B. Yager; S.E. Church; P.L. Verplanck; and Laurie Wirt mapped the ferricrete and bog occurrences. T.C. Sole assisted in digitally compiling data along Cement Creek. D.B. Yager compiled all ferricrete and bog data and created the ArcInfo coverages. Preliminary ferricrete maps were provided by T.J. Casadevall and D.J. Sofield, which were used to guide detailed mapping efforts.
This map was constructed to identify ferricrete occurrences in the upper Animas River watershed. Ferricrete is one indicator of pyrite oxidation and acid rock drainage that have been ongoing in this region since the late Pleistocene. The mapping of ferricrete occurrences increases our understanding of the geochemical baseline conditions that existed in the Animas River watershed prior to mining. The digital GIS coverages provided may be used to evaluate the spatial relationships among iron-rich ground water, ferricrete occurrences,structure, and alteration assemblages.
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Use_Constraints:The intended scale of use for these data is 1:24,000. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data.
The U.S. Geological Survey (USGS) provides these geographic data "as is". The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied, as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by the USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.
|Data format:||Iron and bog occurrence data in format ARCE (version 7.2.1) Size: 2.1|
|Data format:||Iron and bog occurrence data in format Shapefile (version 1.0) Size: 2.1|