Calamite tree seed fern white fossil Gerastos Tuberculatus Marocensis trilobite

Gerastos Tuberculatus Marocensis trilobite

Dating from the upper Cretaceous

Ambient sand was incorporated into the crystal structures that form in arid and sandy conditions

near Antwerp

Western Madagascar

Calamite tree seed fern white fossil Gerastos Tuberculatus Marocensis trilobiteFossilised leaves from the extinct Calamite tree which have been preserved in an ironstone concretion. This two part fossil shows both the fern and its 'negative'. The Calamite was a medium sized tree, growing to around 30 meters (100 feet). Mazon Creek Fossil Beds, Braidwood, Illinois, USA. Carboniferous, circa 309 million years old. Length: 7cm width: 4cm depth: 2cm Measurements are approximate and the minimum size you should expect your item to be.