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LOT 2464
Natural History - Fossil Mesacristata Trilobite
DEVONIAN PERIOD, 417-354 MILLION YEARS B.P.
3 3/8 in. (307 grams, 84 mm).
On a matrix, Hollardops mesacristata. [No Reserve]
ProvenanceFrom the Atlas Mountains, Hamar Laghdad Formation, Pragian, (Alnif), Morocco.
From an old Oxfordshire, UK, fossil and mineral collection.
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AUCTIONS:
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Natural History - Fossil Sporadoceras Goniatite
Upper Devonian Period, circa 385-359 million years B.P.Sold for (Inc. bp): £26
Polished through the shell to reveal the calcite preserved inside and showing the dividing gas chambers; freestanding. 534 grams, 11.8 cm
From the Atlas Mountains, 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 matrices, two with a pair of Knightia alta fossil fish and the third matrix with three specimens. 216 grams total, 8.8-10.4 cm
Ex Lincolnshire, UK, collection. -
Natural History - Knightia Fossil Fish
Eocene Period, circa 58 million years B.P.Sold for (Inc. bp): £78
The rectangular matrix containing a Knightia alta fish. 233 grams, 14.6 cm
From Wyoming (Green River Formation), USA. Acquired during 1980s. From the Pradi Collection, Boston, U.S.A.
Seasonally some 58 million years ago, in the Green River region of Wyoming, torrential rains fell in the mountains. They flowed down the mountain sides, forming wide shallow lakes in the valley below. During the dry season, these lakes would dry up due to evaporation (as happens in 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 entombed all these fish. At a much later date, volcanic activity uplifted this area to expose the fossils.
