Sand Shark Fossil Tooth Group

Sub-translucent formation of greenish-blue aquamarine set on a wooden display stand. 3.42 kg total, 22 cm high including stand



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

Irregular geode matrix with purple amethyst crystals; the metal branches tipped with polished dark and light green aventurine quartz pebbles. 723 grams, 18 cm



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

Showing two Knightia alta fish on a rectangular limestone matrix with a partial third fish. 1.14 kg total, 20.5 x 14.5 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.