Natural History - Large Cut and Polished Septarian Egg Half

Each labelled bag containing a number of mainly dark purple chunks. 689 grams total, 20-35 mm



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

A vertebra with partial neural arch from the dinosaur Deltadromeus agilis. 364 grams, 12.2 cm



From the Kem-Kem Basin, Morocco, North Africa. From an old German paleontological collection.

Deltadromeus meaning 'delta runner' has extraordinarily delicate and long limbs making it one of the fastest dinosaurs to have existed. This meat-eating dinosaur is an early off-shoot of the theropod line on northern continents that gave rise to Tyrannosaurus and the raptor Deinonychus.

Knightia alta specimen on a rectangular matrix. 300 grams, 13.4 cm



From Wyoming (Green River Formation), USA. Acquired during 1980s. From the Pradi Collection, Boston, USA.

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.