Comprising three obelisks with facetted edges. 81 grams total, 44-58 mm



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

Comprising variously sized polished Orthoceras sp. specimens on a textured freestanding matrix. 903 grams, 21 cm



From Atlas Mountains, Morocco, North Africa. From a Cambridgeshire, UK, collection.

Comprising large geode sections lined with lavender and dark purple coloured amethyst crystals. 1.78 kg total, 7.8-13.5 cm



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

A cut and polished half displaying a wolf-shaped formation of brown aragonite within lighter limestone. 242 grams, 84 mm



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

Comprising three irregular matrices, each with 'Dawn Redwood' specimen. 118 grams total, 50-60 mm



From a Lincolnshire, UK, collection.

Agatized and displaying deep red and brown colours. 2.5 kg, 30.6 cm



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

A cut and polished section of petrified wood trunk. 230 grams, 13.4 cm



From Madagascar. From a Lincolnshire, UK, collection.

The upper part of a fossil Argochampsa krebsi crocodile skull on a sandy matrix wrapped in a plaster field jacket. 4.94 kg, 45 cm



From Morocco, North Africa. From a Cambridgeshire, UK, collection.

Argochampsa or 'Argo crocodile' is an extinct genus of eusuchian crocodylomorph, usually regarded as a gavialoid crocodilian, related to modern gharials. It lived in the Paleocene of Morocco. Described by Hua and Jouve in 2004, the type species is A. krebsi. Argochampsa had a long narrow snout, and apparently marine in its behaviour.

Containing small Cymbites, and other ammonites, the three larger specimens set on the matrix. 5.12 kg total, 29 cm



From Yorkshire coast. From a Lincolnshire, UK, collection.

Rounded pebble half containing a Dactylioceras commune specimen. 308 grams, 80 mm



From Yorkshire coast. From a Lincolnshire, UK, collection.

Restrung using recently polished Mammuthus primigenius bone beads. 207 grams, 59 cm



Ex West country, UK, collection, 1990s onwards.

The mammoth lineage branched from the Asian elephant around 6 million years ago, and later on the Woolly Mammoth, Mammuthus primigenius, evolved in eastern Siberia. Woolly mammoths, being slightly smaller than living African elephants, were foragers and ate grass, as well as small, nutritious flowering plants that flourished in the environment where they lived. They may also have used their curved tusks to dig through snow and eat plants that other foragers were unable to reach.

Comprising six crystal clusters, each with attractive clear prismatic crystals. 366 grams total, 50-76 mm



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