Link to U.S. Geological Survey

U.S. Geological Survey Miscellaneous Field Studies Map MF-2406

Ferricrete, manganocrete, and bog iron occurrences with selected sedge bogs and active iron bogs and springs in the upper Animas River watershed, San Juan County, Colorado

By Douglas B. Yager, Stanley E. Church, Philip L. Verplanck, and Laurie Wirt

thumbnail image of map

Version 1.1

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.

The text of this report is presented here in Portable Document Format. The latest version of Adobe Acrobat Reader or similar software is required to view it. If you wish to download the latest version of Acrobat Reader free of charge, click here.

Metadata file (18 KB)

MF-2406 PDF file (2.17 MB)
For viewing
MF-2406 PDF file (89.92 MB) For printing

Text Only PDF file (834 KB)

(This version of the report is accessible as defined in Section 508.)


Download the Arc/Info Files and Supplemental Information
mf-2406.tar.gz (522 KB) (513 KB) logo  Take Pride in America button