These beautiful 2! carboniferous fossil matrixes show a beautiful clear Trigonocarpus! Great quality and magnificent contrast! Positive and negative belonging together. The Trigonocarpus is a seed capsule of a group of plants called Medullosans, also called seed ferns. Medullosans produce seeds, not spores (like ferns), and are more closely related to conifers and flowering plants than to ferns. Although the leaves of Medullosans are very similar to the leaves of ferns. Medullosans lived all over the landscape during the Carboniferous and Permian periods. Some medullosans grew as trees, reaching about 33 feet (10 meters) tall, while others grew as vines, entwined around other plants. The tree-form is notable for having leaves that were up to 10 feet (3 meters). The stones were found by myself in November 2025 in the region of the district Saarland in Germany. Found in rest material that came out of the former coal mines in this region. The fossil is between 309 and 302 million years old.