
Les enchères pour ce lot sont terminées
April 28, 06:28 PM GMT
Estimation
2,500 - 3,000 USD
Description du lot
Description
Morton Gneiss Plate
Canadian Shield, Minnesota River Valley, Southwestern Minnesota, USA
The large rectangular plate having grey pink and black medium to coarse-grained biotite-quartz-plagioclasse gneiss, with bright polished surface, measuring 68 ½ x 48 ¼ inches.
The world’s oldest known rocks come from the Canadian Shield area of North America. Among the most ancient is the present material, Morton Gneiss, dated at approximately 3.5 billion years old. It is believed to be a piece of Earth’s first planetary crust. The swirls and layers result from metamorphism incurred when the original volcanic rock was buried to tremendous depths.
PROVENANCE
Phillips Auction New York, June 3, 1995 (lot 81)
Private Florida collection from 1995 till the present
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