Micraster Sea Urchin.  Micraster Sea Urchin (the featured image above) shows the top surface of the Micraster. The image (left) shows the underside that was attached to the sea-bed. Fossil size 2 1/2″ x 2 1/2″ inches. The Cretaceous Period – 150 million years ago to recent.

Bivalve Clam Shell. Bivalve Clam Shell. This Clam Shell has been fossilised by Permineralisation. Fossil size 2″ x 1 1/4″ inches.   The Triassic Period – 250 million years ago to recent.

Vestinautilus Nautiloid. Vestinautilus Nautiloid. A Squid like creature in a shell housing. Similar to an Ammonite but survived much earlier. Fossil size 3 1/2″ x 1 1/2″ inches. The early Carboniferous Period – 350 million years ago.

Bifericeras Ammonite. Bifericeras Ammonite within a stone matrix. A Squid like creature in a shell housing. Size of matrix 4″ x 3″ inches. The early Jurassic Period – 200 million years ago.

Pavlovia Ammonite. Pavlovia Ammonite. A Squid like creature in a shell housing. Fossil size 2 1/2″ x 3/4″ inches. The late Jurassic to early Cretaceous Period – 150 million years ago.

Douvilleiceras Ammonite. Douvilleiceras Ammonite. A Squid like creature in a shell housing. It had a hard strong and robust shell. Fossil size 2 1/2″ x 1 1/4″ inches. The early Cretaceous Period – 150 million years ago.

Dactylioceras Ammonite. Dactylioceras Ammonite. A Squid like creature in a shell housing. In medieval times these fossils were thought to be petrified Snakes. This fossil shown has a negative and positive matrix. Fossil size 3″ x 2 1/2″ inches. The early Jurassic Period – 220 million years ago.

Belemnite. A Belemnite within a stone matrix, Belemnites and Squids belong to a diverse group of Cephalopods which includes Cuttlefish and Octopus. The group has an internal chambered shell enclosed by soft muscular tissue. Size of matrix 5″ x 3″ inches. Ranging from the Devonian Period – 400 million years to the Cretaceous Period 100 million years ago.

Actinocyathus Coral. Actinocyathus Coral (the featured image above) shows the top surface of the Coral.  The image (left) shows the underside that was attached to the sea-bed. Size of fossil 3″ x 3″ inches.   The early Carboniferous Period – 350 million years ago.

Fossilised Tree Trunk. This tree trunk has been completely transitioned to stone by the process of Permineralization. All the organic material has been replaced with minerals (mostly Silicate such as Quartz) The petrification occurs underground when it becomes buried beneath sediment or volcanic ash.   The fossilisation quartz is colourless but when contaminants are added to the process the crystals …