• When dinosaur fossils surface at a site, it is often not possible to tell how many millions of years ago their bones were buried. • While the different strata of sedimentary rock represent periods of geologic history frozen in time, accurately dating them or the fossils trapped within them has frequently proven to be frustrating. • Fossilized bones and teeth have been dated with some success before, but that success is inconsistent and depends on the specimens. • Both fossilization and the process of sediment turning to rock can alter the bone in ways that interfere with accuracy. • While uranium-lead dating is among the most widely used methods for dating materials, it is just an emerging technology when applied to directly dating fossils. • Dinosaur eggshells might have finally cracked a way to date surrounding rocks and fossils.

Article Summaries:

  • Scientists have developed a new technique that uses fossilized dinosaur eggshells to date the surrounding sedimentary layers and any fossils within them. By analyzing the unique calcium‑carbonate microstructure of the eggshells, researchers can track diagenetic changes that record how long the shells were buried. This method, led by paleontologist Ryan Tucker of Stellenbosch University and published in Nature Communications Earth & Environment, offers a potentially reliable radioisotopic dating tool for continental sedimentary sequences where traditional techniques struggle. If validated, it could broaden the range of rock formations that can be accurately dated, improving our understanding of the timing of dinosaur evolution.
  • Scientists have developed a new technique that uses dinosaur eggshells to date the surrounding sedimentary layers and the fossils within them. By analyzing the unique micro‑structure of calcium carbonate crystals in fossilized eggshells, researchers can record diagenetic changes that occurred during fossilization. This record allows precise determination of how long ago the eggshells were buried, which in turn provides the age of any other fossils in the same rock layer. The method, led by paleontologist Ryan Tucker of Stellenbosch University and published in Nature Communications Earth & Environment, could broaden the range of continental sedimentary sequences that can be accurately dated with radioisotopic methods.

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