Fossils formed when an animal's shell or other hard structure is buried without being ... The movement of groundwater through the limestone has caused formation of chert nodules. The chert is composed ...

The fossils of this rock sequence are commonly found in ancient Archean chert, a hard, fine-grained sedimentary rock composed of microcrystalline or cryptocrystalline quartz. 5. Western Australia ...

Dr Christine Strullu-Derrien, the lead author, stumbled upon the first specimen in 2015 within fossil samples from Scotland's pivotal Rhynie Chert site, known for its exceptionally preserved Early ...