Preserved in a large rectangular block of chalk is this stunning and rare example of this cretaceous chalk sponge. The sponge has been expertly prepared. Examples like this are very seldom seen for sale as most of them end up in museum collections. This is a particularly fine and extremely sought after specimen.
Preserved on a block of chalk is this beautiful specimen. The specimen has been carefully prepared using air abrasive techniques to reveal the fine ornamentation on the shell as well as the delicate long spines. There are modern forms of Spondilus "Spiny Oysters" that still exist today. A very aesthetic and fine specimen.
Cotham Marble is also known as 'Landscape Marble' because of the shrub and tree like structures. This is a biothermal association of algal growth forms. The tree like structures are formed by sediment-binding algae. Approximately 215 million years old. A very nice display fossil for either the home or indeed office space.
This thick section has been ground gem smooth and a very high polish applied to reveal wonderful colours and detail throughout. Cotham Marble, also known as "Landscape Marble" is evidently a biothermal association of algal growth forms. The tree like structures are formed by sediment-binding algae. Approximately 215 million years old. A lovely display fossil.