Complete Unopened 'Discovery' Agate Crystal Geode Collection [3]

Large, polished section of geode showing prismatic dark purple amethyst crystals on the inner surface with a large mass of calcite to one side, the calcite with clusters of small quartz crystals; mounted on a custom-made display stand. 17.1 kg total, 34.5 cm including stand



From Artigas, Uruguay. Property of a London lady.

Comprising three rounded matrices, each with a Knightia alta specimen. 145 grams total, 63-74 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.

Comprising three specimens, one with a cut face showing clearly part of the hexagonal crystal structure. 158 grams total, 30-64 mm



Ex property of a UK gallery, early 2000s.