Natural History - Boxed Historic Yellow Calcite Mineral Specimen

The bendable metal branches tipped with polished citrine pebbles, the trunk resting on a geode section with lavender-coloured amethyst and clear quartz crystals. 511 grams, 16 cm high



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

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.

Cut and polished from a single fossiliferous block and each side set with a large Goniatite sp. specimen. 3.4 kg total, 15.3 cm high each



From a Cambridgeshire, UK, collection.