Details
The upright free-form with dozens of ringed cavities, the specimen supported on stand.
2212 x 17 x 512in. (57.2 x 43.1 x 14cm.)
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Lot Essay

Once thought to be a stromatolite (a very primitive life form), these concretions are now considered abiotic formations from the Precambrian (circa 600 million years ago).
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