Natural History - Large Size Cut and Polished Pink Agate Crystal Geode Slice

The large sandstone matrix with five Knightia alta specimens. 8.25 kg, 50.5 x 38 cm



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.

Comprising clusters of calcite on an iron rich matrix. 96 grams, 96 mm



Collected in person in 1966. From the private mineral collection of Stephen Atkinson, Harpenden, UK. Accompanied by a copy of a letter from the vendor giving details of him collecting these minerals throughout his life.

Comprising: tiger's eye; amber; red jasper with one polished face and old collector's label; pink onyx(?) polished to an egg-shape; sphalerite; titanium bismuth; flint; orange jasper with one polished face an old collector's label; an echinoid fossil; bivalve in flint; a wooden egg-shaped container and others in a wooden case; accompanied by a mounted piece of granite with an old label to base reading 'from Iona Monastery June 1947'. 1.28 kg total, 28.5 x 24 cm



Acquired before 1990s/early 2000s. From the family collection of Jack Lyttle (1944-2023), Kilmacolm, Scotland; thence by descent to his granddaughter. Property of an East Sussex, UK, gentleman.