This report was published August 1981 by Idaho Department of Water Resources. Lithologies not expected to change. Tana Dace, digitizer and coverage creator. William Graham and Linford Campbell, original lithology data. Checkplots created and perused for inaccuracies.
Every polygon has a label and all polygons are closed.
All data from the source mylar map were included in the coverage. Registration RMS error was consistently under .003 except in one area of map. This area exists in SE Idaho in the vicinity of Arco and INEL with a RMS error of .008. We have been unable to discern the cause of the problem. Lithologies not expected to change.