Data set describes a 20-million-year-old shield volcano in the Wrangell volcanic field of north-central Alaska. These digital files were used to create the 1:63,360-scale geologic map of the McCarthy D-1 quadrangle.
Additional publication details
USGS Numbered Series
Geologic map of the McCarthy D-1 Quadrangle, Alaska
1 map :col. ;44 x 31 cm., on sheet 80 x 103 cm., folded in envelope 30 x 24 cm.