Comprising two elongated pieces containing insects and other inclusions. 20 grams total, 10 - 19mm



From a Lincolnshire, UK, collection.

Comprising fourteen teeth, one with only a tip visible, and various jaw fragments set on a sedimentary matrix wrapped in a plaster field jacket. 9.75 kg, 47.5 cm



From a Cambridgeshire, UK, collection. Property of a Cambridgeshire, UK, gentleman.

Mosasaurs (from the Greek for 'lizard') were aquatic dinosaurs which probably gave birth to live young.

Comprising long, coarse outer hairs and a dense tuft of the undercoat; supplied in a display case. 24 grams including case, case: 50 x 50mm



From Yacutia, Siberia. Ex Gerald Lucy Rocks, minerals and fossils. From the private collection of Kenneth Machin (1936-2020), Buckinghamshire, UK; his collection of antiquities and natural history was formed since 1948; thence by descent. Accompanied by a Gerald Lucy information display card.

A polished cabochon with a central insect inclusion, inked collector's note to one end '132'; mounted on cardboard backing. 0.87 grams total, amber: 13 mm



Acquired on the UK art market before 2000. Property of an Essex, UK, gentleman.

Comprising three polished milky opal specimens showing play of colour. 1.93 grams total, 12-14 mm



Acquired on the UK art market before 2000. Property of an Essex, UK, gentleman.

From Carcharocles megalodon polished, showing some good enamel. 78 grams, 79 mm



Acquired on the UK art market before 2000. Property of an Essex, UK, gentleman.

Carcharodon megalodon is regarded as one of the largest and most powerful marine predators in vertebrate history and likely had a profound impact on structuring of the marine communities. Fossil remains indicate that this giant shark reached a length of more than 16 metres (52 ft) and also affirm that it had a cosmopolitan distribution. Scientists suggest that in life it looked like a stockier version of the great white shark, Carcharodon carcharias.

The nodule split in half to expose the crystal filled cavity with dyed pink crystals. 127 grams total, 53 mm each



From a Cambridgeshire, UK, collection. Property of a Cambridgeshire, UK, gentleman.

The aquatic arthropod showing good detail to the carapace, resting on an irregular matrix. 120 grams, 72 mm



From a Cambridgeshire, UK, collection.

Ophiuroidea sp. on an irregular matrix. 366 grams, 14.4 cm



From a Cambridgeshire, UK, collection.

Knightia alta specimen on a rectangular matrix. 439 grams, 15.5 cm



Ex AA Shop, Windsor, UK; and Donaldson 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.

A rare Primigatus sp. fish on a rectangular matrix. 285 grams, 145 mm



From Lebanon. From a Cambridgeshire, UK, collection.

Priscacara liops fish in rectangular matrix, showing good detail especially to the fins. 433 grams, 220 mm



From a 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.