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LOT 2390
Natural History - Cut and Polished Fossil Ammonite
MIDDLE CRETACEOUS PERIOD, 150 MILLION YEARS B.P.
3 - 3 1/8 in. (124 grams total, 77-81 mm).
Polished to reveal the distinctive structure of the Cleoniceras sp. chambers, some iridescence. [2, No Reserve]
ProvenanceFrom Madagascar.
Collected 1930-1960.
From the collection of the palaeontologist R. Gledhill.
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AUCTIONS:
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Natural History - Large Blue Agate Book End Pair
Sold for (Inc. bp): £65
A polished blue banded agate book end pair, showing some exposed crystals. 4.6 kg total, 13.5-14.5 cm
From a Humberside, UK, collection. -
Natural History - Fossil Brittle Stars
Middle Ordovician Period, circa 450 million years B.P.Sold for (Inc. bp): £34
Comprising a pair of Ophiuroidea sp. on an irregular matrix. 321 grams, 16.5 cm
From El Kaid, Morocco. Acquired 1950s-1960s. From an old Bristol, UK, palaeontological collection. -
Natural History - Knightia Fossil Fish Group
Eocene Period, 56-33 million years B.P.Sold for (Inc. bp): £65
Comprising three round matrices, two with a single specimen and the third matrix with two overlapping Knightia alta fossil fish with remains of another to the edge. 174 grams total, 72-85 mm
Ex 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.
