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LOT 2471
Natural History - Fossil Seed Fern Pair
MIDDLE PENNSYLVANIAN PERIOD, CIRCA 300 MILLION YEARS B.P.
2 1/4 - 2 3/8 in. (118 grams total, 58-60 mm).
Comprising two pairs of Pecopteris sp. [4, No Reserve]
ProvenanceFrom the Mazon Creek Fossil Beds, Braidwood, Illinois, USA.
Collected 1930-1960.
From the collection of the palaeontologist R Gledhill.
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AUCTIONS:
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Natural History - Mastodon Bone Face Carving
Pliocene Period, 5.2-2.5 million years B.P.Sold for (Inc. bp): £65
Displaying a later carved stylised face with exaggerated facial detailing. 74 grams, 78 mm
Private UK collection formed in the 1980s. Property of an East Sussex, UK, teacher. -
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 of Sporadoceras sp. 330 grams, 10.8 cm
From the Atlas Mountains, Morocco. Acquired 1950s-1960s. From an old Bristol, UK, palaeontological collection. -
Natural History - Knightia Fossil Fish
Eocene Period, circa 58 million years B.P.Sold for (Inc. bp): £78
The Knightia alta fossil fish on a rectangular matrix. 234 grams, 14.4 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.
