Natural History - Cut and Polished Agate and Amethyst Mineral Specimen Slab

Diplomystus sp. specimen on a matrix. 398 grams, 15.2 cm



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 two polished, dome-shaped masses, each with a central Goniatite sp. specimen. 858 grams total, 13.9 cm



From the Atlas Mountains of Morocco, North Africa. From a Cambridgeshire, UK, collection.

Comprising a mixed group of nine fossils in five card trays, different species and types including: Ichthyosaurus, Plesiosaurus, and whale bone from Walton-on-the-Naze, Essex. 981 grams total, 40-92 mm



From various sites in the UK. From a Norfolk, UK, collection.