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LOT 2508
Natural History - Cut Fossil Ammonite Halves
MIDDLE CRETACEOUS PERIOD, 150 MILLION YEARS B.P.
4 3/8 in. (357 grams total, 11.2 cm each).
Polished to reveal the distinctive structure of the Cleoniceras sp. chambers, some iridescence; chip to edge of one half. [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 - Knightia Fossil Fish
Eocene Period, 56-33 million years B.P.Sold for (Inc. bp): £33
In a rectangular matrix. 345 grams, 18 x 12.5 cm
Fine condition.
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. -
Natural History - Fossil Tree Trunk Section
Late Triassic Period, circa 225 million years B.P.Sold for (Inc. bp): £20
Cut and polished to reveal the internal structure; freestanding. 779 grams, 10.4 cm
From a Cambridgeshire, UK, collection. -
Natural History - Fossil Hybodus Shark Fin Spine Group
Lower Cretaceous Period, circa 95 million years B.P.Sold for (Inc. bp): £7
Comprising three specimens. 57 grams total, 7.9-12.7 cm
From the Kem Kem Basin, Eastern Morocco, North Africa. Collected between 1930 and 1960. From the collection of the palaeontologist R Gledhill.
