Bedrock geology for Áak’w & T’aakú Aaní. Units based upon a shapefile by USGS, but color coded by 6 broad rock-type families. Expand the legend (>>, upper left), then tap again on > for dropdown color palette. Granitic types (pink, our highest & most resistant peaks) are mostly back under the icefield. Rocks with highest carbonate content (blue) hosted most of Juneau’s successful mines. For more info on each rock unit, click, and a popup will name the geologic period (capital letters in the code), dominant rocks, and broader rock family
4-box-selector on left gives choice of basemaps. Best for seeing bare-earth landforms is National Geographic Style Map.
