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LOT 2735
Fossil Platyostoma Gastropod on Matrix
SILURIAN PERIOD, CIRCA 430 MILLION YEARS B.P.
3 5/8 in. (242 grams, 92 mm).
Platyostoma niagarensis set on an irregular matrix. [No Reserve]
ProvenanceAcquired Hunstanton, UK.
From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent.
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AUCTIONS:
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Meteoritic Tektite Specimen
Sold for (Inc. bp): £33
A cigar-shaped specimen with dimpled surface. 12.3 grams, 68 mm
From South East Asia. Acquired from Organica Gems. From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent.
Tektites are lumps of black or dark grey natural glass produced from melted crustal rocks that are caused by large hypervelocity meteorite impacts on sediments. -
Sawfish Fossil Rostral Spine Group
Cretaceous Period, circa 100-66 million years B.P.Sold for (Inc. bp): £13
Comprising three Onchopristus numidus sawfish rostral teeth. 48 grams total, 48-60 mm
From a Cambridgeshire, UK, collection. -
Green River Fish Fossils
Eocene Period, circa 58-36 million years B.P.Sold for (Inc. bp): £33
Comprising three rounded matrices with Knightia alta fish fossils. 143 grams total, 8.6-10.5 cm
From Wyoming (Green River Formation), USA. From a Lincolnshire, UK, collection.
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.
