Natural History - NWA 073 L6 Chondrite Meteorite Slice in Case

Diplomystus sp. on a large rectangular matrix. 724 grams, 21.1 cm



From The Green River Formation, Wyoming, USA. Ex 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.

Well preserved fossil Euthriofusus Regularis, gastropod shell. 12.8 grams, 55 mm



From the Barton Beds, Hampshire, UK, 1960. From a Leicestershire, UK, collection. Accompanied by an explanatory note.

With some good enamel, from Bahariasaurus ingens. 5.93 grams, 42 mm



Acquired during the 1980s. From an old Lincolnshire, UK, collection.

Bahariasaurus ingens was a mid-sized carnivore, and the teeth are different from Carcharodontosaurus in being thinner but having a thicker, more triangular X- section.