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LOT 1830
Natural History - British Polished Ichthyosaur Vertebrae Display
JURASSIC PERIOD, CIRCA 180 MILLION YEARS B.P.
6 1/2 in. (236 grams, 16.5 cm).
A polished fossil Ichthyosaur sp. vertebrae section in a jet matrix, partially pyritised; Upper Lias. [No Reserve]
ProvenanceFrom Sandsend, Whitby, North Yorkshire, UK.
Property of a Leicestershire, UK, private collector.
Ichthyosaurs (Greek for "fish lizard" - ichthus meaning "fish" and sauros meaning "lizard") were giant marine reptiles that resembled dolphins, in a textbook example of parallel evolution. They thrived during much of the Mesozoic era; based on fossil evidence, they first appeared approximately 245 million years ago and disappeared about 90 million years ago, about 25 million years before the dinosaurs became extinct.
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AUCTIONS:
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LOT 1830
Natural History - British Polished Ichthyosaur Vertebrae Display
Sold for (Inc. bp): £169
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Natural History - Desert Rose Specimen Group
Sold for (Inc. bp): £33
A group of 100 'Desert Rose' crystalline gypsum specimens with sand grain inclusions, mostly of single spheroid form, showing the crystal plate structure to advantage. 518 grams total, 13-31 mm
Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's). -
Natural History - Very Large Quartz Crystal Specimen Group
Sold for (Inc. bp): £13
A group of three very large quartz crystal specimens, each with one pointed terminal. 1.36 kg total, 11.3-13 cm
From Brazil. Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's). -
Natural History - Knightia Fossil Fish
Eocene Period, 56-33 million years B.P.Sold for (Inc. bp): £33
A Knightia alta fossil fish in matrix. 678 grams, 18 cm wide
From Wyoming, Green River Formation, U.S.A. Acquired during the 1980s. From the Pradi Collection, Boston, U.S.A.
Seasonally, some 56 million years ago, in the Green River Region of Wyoming, torrential rains fell on the mountains. The rain flowed down the mountain sides, forming wide shallow lakes in the valley below. During the dry season, these lakes evaporated (similar to certain parts of Africa today). Millions of fish died in this short period of time. This climatic cycle happened over a 20-thousand-year period. Layer upon layer of mud was deposited over these years, entombing huge numbers of fish. At a much later date volcanic activity uplifted this area to expose their fossils.
