Natural History - British Arnioceras Fossil Ammonite 'Hidden Gem' Pair

The Mioplosus labracoides fish in a rectangular matrix. 837 grams, 16.5 cm



From Warfield's Quarry, Kemmerer, 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.

Komlosaurus carbonis on an irregular matrix with information ticket. 2.79 kg, 34 cm



From the Mecsek Coal Formation, Middle Hettangian to Early Sinemurian, Lower Lias, Lower Jurassic, Komlo, Mecsek Mountains. Baranya, Hungary. From the private collection of Mr J S, Northamptonshire, UK. Property of a Cambridgeshire gentleman.

Comprising specimens of different sizes, including examples retaining some or most of the root, enamel and/or serration. 940 grams total, 9-30 mm



Acquired 1990s-early 2000s. East Anglian private collection.