Natural History - Large Blue Agate Crystal Cut and Polished Slice

Comprising a mixed group of eight fossils in eight card trays, different species and types including: Rugose Coral from Toddington, Derbyshire; Parinoceramus ventricosus and Aegoceras sp. ammonite from Blockley in Gloucestershire; Hysteroceras sp. ammonites from the foreshore at Folkestone, Kent; Dactylioceras commune from Staithes, Yorkshire; Hildoceras bifrons from near Eype, Dorset; and Dactylioceras sp. ammonite from Seavington St. Michael, Dorset. 1.2 kg total, 2-10.5 cm



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

Comprising four large examples showing clusters of well-formed pseud-hexagonal twinned crystals. 1.09 kg total, 7.8-10.1 cm



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

A negative impression of Diplomystus sp. specimen on a rectangular matrix. 441 grams, 15 cm



From Wyoming (Green River Formation), USA. From an old Bristol, 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.