Weirdest Fossil Ever Found: Rare Jimbacrinus Crinoid Fossils Discovered in Western Australia, Dating Back an Astonishing 280 Million Years

An image that has recently gone viral on social media depicts a well-preserved set of fossils from a marine creature that lived 280 million years ago. But what was this animal exactly?

Image credit: FossilEra

The fossils in question are those of Jimbacrinus crinoids, or sea lilies, and were found in Western Australia. These marine creatures lived approximately 280 million years ago, during the Permian period, and their fossils provide valuable insights into the evolution and diversity of life on Earth.

The fossils were first brought to the attention of the wider public through an image that circulated widely on social media. The image shows them arranged in a pattern that suggests they had been buried in sedimentary rock in their natural habitat. The fossils were reportedly found near Gascoyne Junction, a remote area in Western Australia that is known for its geological diversity.

A similarly well-preserved set of fossils found near Gascoyne Junction, Australia. Image credit: Crystal World

When the Midwest Times investigated the origins of the image, they found that it had been posted on the website of a US-based fossil dealer. The dealer claimed that the fossils were legally obtained and could be sold to interested buyers. This raised some questions about the legal status of fossil collection and trade in Australia, where laws regarding the collection and sale of fossils vary from state to state.

David Gear, a representative from the Western Australian Museum, clarified the legal status of fossil collection in Western Australia. According to Gear, it is legal to collect and export fossils under certain circumstances, but collectors must obtain the necessary permits and follow guidelines for responsible fossil collecting. Gear also emphasized the importance of leaving fossils in their natural environment whenever possible, as they provide important scientific data about the history of life on Earth.

280-million-year-old Jimbacrinus crinoid found near Gascoyne Junction, Western Australia. Image credit: Matthew Bietz

The alien-looking fossils of Jimbacrinus bostocki crinoids – which were once abundant in the shallow seas that covered much of Western Australia during the Permian period – were first discovered in 1949 by the manager of Jimba Jimba cattle station, for which the genus was named. Mr. J Bostock (after whom the species itself was named) found the fossils in the Cundlego Formation, a sandstone formation created by flooding and storm event deposition during the Early Permian period approximately 275 million years ago.

This deposit was found along a dry creek bed and contained the fossilized remains of numerous species that resided on the sea floor during that era. Interestingly, these fossils are usually found complete and have not been uncovered in any other location.

Signs near Gasocyne Junction in the Australian Outback, where the fossils were found. Image credit: Calistemon

The fossil deposit near Gasocyne Junction provides a glimpse into the extinction events of the Permian Period, at the end of which the “Great Dying” occurred. This was the largest and most severe of the five known mass extinction events throughout recorded geological time, causing more than 90% of all marine species to vanish from the fossil record. The rising global temperatures led to warmer and more acidic waters, increased methane and metal levels, and a severe drop in oxygen levels in waters made it difficult for marine animals to survive. Still, a small proportion of crinoids managed to survive the extinction event, and over 600 species exist today.

FUN FACT: Crinoid fossils were the inspiration for the Sentinels in the Matrix Movies. Although the Sentinels initially had several functions, they eventually evolved into robotic killing machines that scoured the underground metropolis in search of humans and Zion ships, serving the Matrix’s agenda.

Illustration by PIDJY – 2003

The Jimbacrinus crinoids found near Gascoyne Junction are particularly noteworthy for their excellent preservation, which may enable scientists to study their soft tissues and internal structures in greater detail.


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