Michael E. Brownfield             Research Geologist

United States Geological Survey
Box 25045 Denver Federal Center Mail Stop 939
Denver, CO 80225-0046
U.S.A.
303.236.7767
mbrownfield@usgs.gov

Mikhail Yu. Povarennykh         Senior Scientific Researcher

Vernadsky State Geological Museum
Mokhovaya Street, House 11, Building 2
Moscow, 103009
Russia
095.292.0586
povar@sgm.ru

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