The following note appears on the published source map (Gray, 1989): This map was prepared
using data from many sources, among the most important being earlier geologic work of Frank
Leverett, C. A. Malott, W. D. Thornbury, W. J. Wayne, A. F. Schneider, A. M. Gooding, and
G. H. Johnson. These were supplemented by field investigations, soils maps, and drilling
data. Many of the concepts and interpretations used in the mapping have evolved through
discussions with N. K. Bleuer, G. S. Fraser, and J. R. Hill. Geologic assistance by J. J.
Johnson, D. P. Brewester, W. E. Nellist, D. A. Heidt, A. W. Bottum, and D. K. Spaulding.
Drafted by Roger L. Purcell and assisted by Lori A. Zinn.
Tests for attribute consistency were performed by IGS personnel:
Values of each field were checked, using the QueryBuilder Tool in Arcview.
(a) Completeness of values were verified.
- All attribute values in the shapefile were confirmed to be present
on the paper source map.
- No values were left blank, unless appropriate.
(b) Validity of values was verified.
- All values were checked for spelling and capitalization.
(c) Relationships between fields symbol and description were created with a database join.