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LOT 1996
Natural History - Cut and Polished Fossil Ammonite
JURASSIC PERIOD, 199-145 MILLION YEARS B.P.
4 3/4 in. (405 grams total, 11.9 cm wide each).
A pair of cut and polished fossil ammonite halves, each displaying the gas chambers; possibly Cleoniceras sp. [2, No Reserve]
ProvenanceFrom Madagascar.
Collected between 1930 and 1960.
From the collection of the palaeontologist R Gledhill.
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AUCTIONS:
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Natural History - Medium Uncut and Polished Fossilised Wood Branch Specimen Group
Sold for (Inc. bp): £33
A group of ten fossil branch sections of varying length and thickness. 1.2 kg total, 6.3-10.7 cm
From Madagascar. Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's). -
Natural History - Amethyst Crystal Section
Sold for (Inc. bp): £33
A section of amethyst geode displaying some large purple crystals. 677 grams, 85 mm
From Brazil. Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's). -
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Natural History - Fossil Diplomystus Fish
Eocene Period, 56-33 million years B.P.Sold for (Inc. bp): £46
A fossil Diplomystus sp. fish in a matrix. 500 grams, 16.5 x 11.7 cm
From the Green River Formation, Lincoln County, Wyoming, U.S.A. From an old Lincoln, UK, collection.
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.
