Photograph of specimen PMO 219.250. Credit: Engelschiøn et al. PLOS ONE, CC-BY 4.0
New analysis reveals that sulfur minerals that make fossils within the Norwegian archipelago are particularly well-suited to radiography.
X-ray evaluation has led to the categorization of a previously-unidentified marine reptile fossil found in Edgeøya, Svalbard. The analysis was lately revealed within the journal PLOS ONE. The research, performed by Victoria S. Engelschiøn of the University of Oslo and her workforce, means that this technique may reveal recent insights about historical life sooner or later.
The effectiveness of X-ray methods in investigating well-conserved fossil stays is commonly depending on the situation of preservation, which may fluctuate significantly throughout completely different websites. Through this research, Engelschiøn and her workforce confirmed that fossils from the Middle Triassic Botneheia Formation in Svalbard, Norway, are particularly suitable for radiographic imaging.
An overlook of the Muen plateau as seen from the Muen mountain on Edgeøya, Svalbard. Marine reptiles are spread out across the plateau. Author VSE in red jacket for scale. Credit: Sofie Bernhardsen, CC-BY 4.0
The focus of this study is a fossil marine reptile whose remains are compressed and encased in shale. It lived around 240 million years ago, when Svalbard was covered by an ocean. After it died, it sank to the seafloor and was buried in the mud, then became extremely flattened over time. Originally excavated in 2008, the identity of this fossil has since been debated. X-ray imaging of the specimen revealed new details, including features of the skull and teeth that allowed researchers to conclude that this reptile most likely belongs to the ichthyosaur species Phalarodon atavus.
The authors also examined the mineralogy of fossils from this formation, identifying multiple forms of sulfate minerals, notably including sulfate baryte, which gives the fossils very high X-ray contrast, allowing for the high quality of radiographic imaging. The formation of these minerals is little understood but could be linked to conditions created by ancient volcanic activity. Thus, this study not only demonstrates the utility of X-ray techniques for studying these fossils, but also identifies conditions that can form fossils well-suited for these techniques, in Svalbard and potentially elsewhere.
The authors add: “The rocks from Svalbard are full of flattened marine reptiles. Our discovery of the exceptional X-Ray contrast means that we can learn much more about these ancient predators than we previously thought.”
Reference: “Exceptional X-Ray contrast: Radiography imaging of a Middle Triassic mixosaurid from Svalbard” by Victoria S. Engelschiøn, Aubrey J. Roberts, Ruben With and Øyvind Hammer, 31 May 2023, PLOS ONE.
DOI: 10.1371/journal.pone.0285939
