Period: Middle Devonian (393-388 ma)
Location: Djebel Issomour, Alnif (Morocco)
Description: This trilobite has not been found in the usual timeline, but in a lower layer.
Fulgurite (lightning tube)
Description: Fulgurite resulting from the fall of an atmospheric lightning on a sandy ground, causing the fusion of the silica grains, being crystallized in the form of a tube.
Origin: Sahara Desert (Algeria)
Origin: Caithness (Scotland)
Description: Osteolepis was a tetrapodomorphic sarcopterygian that lived in the fresh waters found in the plains of the North Atlantic continent. Due to their anatomical characteristics, they are located in the line that gave rise to amphibians.
Description: Gastrolites are stomach stones used within the digestive tract of an animal. Sauropod dinosaurs are believed to have used large amounts of rocks to crush the plant matter they fed on.
Period: Lower Cretaceous
Origin: Carter Country, Oklahoma (USA)
Oncolith around Brotia scheri
Origin: Aude (France)
Description: Concentric layers around Brotia scheri. Oncoliths are microbialites with spherical or ovoid sedimentary structures of organic origin, formed by concentric layers of calcium carbonate.