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_900x900.jpg "Natural History - Fossil Diplomystus Fish")
_200x200.jpg "Natural History - Fossil Diplomystus Fish")
.jpg "Natural History - Fossil Diplomystus Fish")
LOT 2461
Natural History - Fossil Diplomystus Fish
EOCENE PERIOD, 56-33 MILLION YEARS B.P.
5 1/8 x 3 3/8 in. (112 grams, 13.2 x 8.5 cm).
In a matrix. [No Reserve]
ProvenanceFrom the Green River Formation, Lincoln County, Wyoming, U.S.A.
From an old Lincoln collection.
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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Natural History - Mosasaur Fossil Tooth Group
Cretaceous Period, 145-65 million years B.P.Sold for (Inc. bp): £20
Of three teeth from Prognathodon sp., mosasaur specialised in eating tough shelled prey. 27.2 grams, 33-45 mm
UK collection since the 1990s. Property of a Sussex, UK, teacher. -
Natural History - Mosasaur Fossil Jaw Section
Late Cretaceous Period, 70 million years B.P.Sold for (Inc. bp): £26
Comprising a partial jaw and two teeth from Igdamanosaurus aegyptiacus. 110 grams, 72 mm
From the Oulad Abdoun Basin, Morocco, North Africa. Collected between 1930 and 1960. From the collection of the palaeontologist R Gledhill.
Most Mosasaurs had sharp teeth that had evolved to grab slippery prey such as fish. Igdamanosaurus had semi-spherical teeth with rounded points, which were better suited for crushing tough-armoured prey such as turtles, ammonites, nautili, and bivalves. -
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Natural History - Knightia Fossil Fish Group
Eocene Period, 56-33 million years B.P.Sold for (Inc. bp): £52
Comprising seven complete and two partial Knightia alta fossil fish in a rectangular matrix. 373 grams, 15.3 x 9.8 cm
Fine condition.
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.
