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LOT 2538
Aventurine Gem Tree on Amethyst Crystal Geode Section
7 in. (723 grams, 18 cm).
Irregular geode matrix with purple amethyst crystals; the metal branches tipped with polished dark and light green aventurine quartz pebbles. [No Reserve]
ProvenanceFrom Brazil.
Ex Mineral Imports, London, UK.
Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.
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AUCTIONS:
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Fossil Brittle Star on Matrix
Ordovician Period, circa 485-443 million years B.P.Sold for (Inc. bp): £78
An irregular matrix with Ophiuroidea sp. specimen. 362 grams, 16 cm
From a Cambridgeshire, UK, collection. -
Round Amethyst Crystal Geode with Polished Borders
Estimate: £2,000 - 3,000 (+bp*)
Opening Bid: £1,100
An unusual rounded geode section with stalagmite-like formations of calcite and quartz rising from the base, polished borders revealing the celadonite shell with some exterior basalt visible; accompanied by a custom-made display stand. 17.5 kg total, 29.5 cm high including stand
From Artigas, Uruguay. Property of a London lady. -
Knightia Multiple Fossil Fish Plate
Eocene Period, circa 58-36 million years B.P.Sold for (Inc. bp): £72
An oval matrix with four small and one large Knightia alta specimens. 192 grams, 14.4 cm
From Wyoming, USA. From a Lincolnshire, UK, collection.
In southwest Wyoming (and parts of Colorado and Utah), in the Green River Formation, are found some of the world's most outstanding specimens of fossil fish. The Green River system was composed of three lakes: Lake Uinta, Lake Gosiute and Fossil Lake. These Eocene lakes lay in a series of intermountain basins formed by geological events that uplifted the Rocky Mountains during the early Tertiary time. The climate was much different from the desert-like climate of this area today. Both the fauna (crocodiles, alligators, boa constrictors and some subtropical fish families) and the flora (such as large palm trees) indicate a climate much like that found along the Gulf Coast today. Large amounts of ash found in the sediments indicate that volcanoes were particularly active at this time.
