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LOT 2464
Australian Opal Group
1/4 - 7/8 in. (6.71 grams total, 8-22 mm).
Comprising seven milky examples showing good play of colour, five polished. [7, No Reserve]
ProvenanceAcquired on the UK art market before 2000.
Property of an Essex, UK, gentleman.
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AUCTIONS:
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Green River Fossil Knightia Fish Group
Eocene Period, circa 56-33 million years B.P.Sold for (Inc. bp): £26
Comprising three rounded matrices, two with a single Knightia alta specimen and one with a pair of fish. 188 grams total, 73-98 mm
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 Ulinta, 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. -
Fossil Gryphaea Bivalve
Jurassic Period, circa 150-200 million years B.P.Sold for (Inc. bp): £1
Gryphaea arcuata Lamarck showing good detail, a small oyster shell attached to the lower end. 167 grams, 69 mm
From Conersby Quarry, Scunthorpe, Lincolnshire, UK. Ex old British collection. From a Leicestershire, UK, collection. Accompanied by a copy of an illustrated information sheet. -
Fossil Mamite Ammonite on Stand
Cretaceous Period, circa 90 million years B.P.Sold for (Inc. bp): £20
The horned ammonite with regularly disposed spines to the outer shell, set on a domed stone stand. 937 grams total, 130 mm
From a Cambridgeshire, UK, collection.
