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![Cut and Polished Agate Geode Slice Group [6]](https://timelineauctions.com/zoom_images/zoomthumb/2/2/227946_900x900.jpg "Cut and Polished Agate Geode Slice Group [6]")
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LOT 2618
Cut and Polished Agate Geode Slice Group [6]
4 5/8 - 5 1/4 in. (625 grams total, 11.7-13.4 cm).
Comprising: three with red and white banding; three green dyed with white banding. [6, No Reserve]
ProvenanceFrom Brazil.
Ex Mineral Imports, London, UK.
Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.
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AUCTIONS:
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Meteoritic Tektite Specimen
Sold for (Inc. bp): £59
A tongue-shaped specimen with dimpled surface. 8.44 grams, 44 mm
From Indo-China. Acquired from Friars Square market, Aylesbury, UK, October 2012. 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. -
Detailed Fossil Ammonite Display
Jurassic Period, Toarcian, circa 184.2-174.7 million years B.P.Sold for (Inc. bp): £1,560
An impressive freestanding structure containing scallop and belemnite fossils, as well as Hammatoceras and Grammoceras sp. ammonites showing strong ribbing, the largest specimen measuring 23 cm in diameter. 50.1 kg, 64.5 cm
with Science & Natural History, South Kensington, 27 April 2017, no.27. -
Knightia Fossil Fish
Eocene Period, circa 58-36 million years B.P.Sold for (Inc. bp): £39
A rounded matrix with two Knightia alta fish with faint remains of another one. 62 grams, 91 mm
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.
