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LOT 2490
Natural History - Historic 'Sierra Madre, Mexico' Rhyolite Mineral Specimen
4 1/8 in. (315 grams, 10.5 cm high).
Displaying attractive brown banding, probably due to wind-weathering, collection number 363. [No Reserve]
ProvenanceAcquired on the UK mineral and fossil market, since 1970.
From the historic mineral collection of Richard Valentine Cain, London, UK, thence by descent.
Accompanied by an original historic index file card.
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AUCTIONS:
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LOT 2490
Natural History - Historic 'Sierra Madre, Mexico' Rhyolite Mineral Specimen
Sold for (Inc. bp): £247
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Natural History - Fossil Ichthyosaur 'Marine Dinosaur' Coprolite
Early Jurassic Period, circa 199 million years B.P.Sold for (Inc. bp): £13
Irregular coprolite with tiny fish-bone inclusions. 32 grams, 52 mm
From Broad Ledge, near Church Cliffs, Lyme Regis, Dorset, 2004. From a Leicestershire, UK, collection. Accompanied by a copy of a previous illustrated catalogue page. -
Natural History - Fossil Plesiosaur 'Marine Dinosaur' Vertebra Group
Jurassic Period, circa 200-145 million years B.P.Sold for (Inc. bp): £52
Comprising two main bodies. 617 grams total, 86-96 mm
From a Cambridgeshire, UK, collection. -
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Natural History - Knightia Fossil Fish
Eocene Period, circa 56-33 million years B.P.Sold for (Inc. bp): £33
Knightia alta specimen on a rectangular matrix. 397 grams, 13.3 cm
From Wyoming (Green River Formation), 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 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.
