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LOT 1919
Natural History - Knightia Fossil Fish
EOCENE PERIOD, 56-33 MILLION YEARS B.P.
5 x 4 3/8 in. (336 grams, 12.6 x 11 cm).
A pair of Knightia alta fossil fish in a matrix. [No Reserve]
ProvenanceFrom 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.
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AUCTIONS:
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Natural History - Large Cut and Polished Agate Crystal Geode Slice
Sold for (Inc. bp): £117
A large blue-coloured cut and polished agate geode slice; colour-enhanced. 660 grams, 28.2 cm
Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's). -
Natural History - Fossil Dragonfly Larvae in Matrix
Miocene Period, circa 16 million years B.P.Sold for (Inc. bp): £156
An amorphous matrix displaying at least three fossil Libellula doris dragonfly larvae and another fossil; held in a collector's presentation box. 205 grams total, 16 x 13.5 cm including box
Ex Gloucestershire, UK, collection. -
Natural History - Insects in Baltic Amber Group
Oligocene Period, circa 45 million years B.P.Sold for (Inc. bp): £59
A group of five Baltic amber pieces, each containing flies together with other inclusions. 3.3 grams total, 11-23 mm
Collected between 1930 and 1960. From the collection of the palaeontologist R Gledhill.