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LOT 2432
Natural History - Mosasaur Fossil Tooth Group
CRETACEOUS PERIOD, 145-65 MILLION YEARS B.P.
1 1/8 - 1 3/8 in. (26 grams total, 30-35 mm).
Of three teeth from Prognathodon sp., mosasaur specialised in eating tough shelled prey. [3, No Reserve]
ProvenanceUK collection since the 1990s.
Property of a Sussex, UK, teacher.
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AUCTIONS:
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Natural History - Knightia Fossil Fish in Matrix
Eocene Period, 58-33 million years B.P.Sold for (Inc. bp): £33
Displaying a fossil Knightia sp. fish. 235 grams, 12.2 cm
Acquired during the 1980s. From the Pradi Collection, Boston, U.S.A.
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. -
Natural History - Deltadromeus Dinosaur Fossil Leg Bone Section
Cretaceous Period, 90 million years B.P.Sold for (Inc. bp): £26
From the front leg of Deltadromeus agilis. 405 grams, 18 cm
From the Kem-Kem Basin, Morocco, North Africa. From an old German paleontological collection.
Deltadromeus had extraordinarily delicate and long limbs making it one of the fastest dinosaurs to have existed. This meat-eating dinosaur was an early off-shoot of the theropod line on northern continents that gave rise to Tyrannosaurus and the raptor Deinonychus. -
Natural History - Priscacara Fossil Fish
Eocene Period, 58-36 million years B.P.Sold for (Inc. bp): £117
In a rectangular matrix. 385 grams, 16.5 x 13.5 cm
Fine condition. Scarce.
Lincolnshire, UK, 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.
