Large Group of Four Hundred [400] Cut and Polished Mini Agate Geode Halves

Large quantity of pale coloured topaz pebbles, including quartz and possibly some other specimens. 1.3 kg total, 11-52 mm



Ex Mineral Imports, London, UK. Gregory, Bottley & Lloyd (Gregory's), Harwich, UK.

A Knightia alta fish on a rectangular limestone matrix. 929 grams, 17.5 x 12.5 cm



From Wyoming, USA. From the private collection of a Devon, UK, lady.

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 Uinta, 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 two intergrown egg-shaped mounds, produced by the activity of ancient cyanobacteria, the sediment layers visible on the underside. 853 grams, 11.9 cm



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.