An onion-shaped dome is built above the structural dome, over an eight-sided cupola.
4.
Supported by and about three feet off the structural domes is a cladding sphere to which the shiny Alucobond panels and drainage system are mounted.
5.
It is best displayed by streams draining a maturely dissected structural dome or Red Valley, which nearly encircles the domal structure of the Black Hills of South Dakota.
6.
This coincided with the release of reports of a multiple year United States Geological Survey research project which mapped the bottom of Yellowstone Lake and identified a structural dome that had uplifted at some time in the past.
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