The fossil specimen we study in this paper was thought to be a 50 million year old skin moult from a lizard….of some unknown variety. Our work was able to map the presence of teeth that could not be seen in visible light. Our x-ray mapping technique showed the presence of phosphorus from teeth and their precise location relative to the rest of the head and body. This is VERY important as now, our fossil skin cannot be a moult….lizards do not moult their teeth when shedding their skin….so we now know something has wiped-out (disolved) the bone, post-mortem, but preserved the skin…along with a whiff of the original skeleton, albeit the teeth. This changes how we view the taphonomy (from the Greek taphos 'burial' and nomos 'laws')…but also allows us to identify the type of lizard for the first time, based upon the geometry of the teeth.
This means we can now start looking for traces of animals that are totally invisible in visible light, but shine a bright chemical signature under the powerful gaze of the synchrotron. This 'x-ray vision' will enable palaeontologists to add important information on the biology, anatomy and preservation of ancient life.
Our new paper can be downloaded from this link: N.P. Edwards, R.A. Wogelius, U. Bergmann, P. Larson, W.I. Sellers, P.L. Manning. 2012. Mapping Prehistoric Ghosts in the Synchrotron. Applied Physics A, DOI 10.1007/s00339-012-7484-3
Our new paper can be downloaded from this link: N.P. Edwards, R.A. Wogelius, U. Bergmann, P. Larson, W.I. Sellers, P.L. Manning. 2012. Mapping Prehistoric Ghosts in the Synchrotron. Applied Physics A, DOI 10.1007/s00339-012-7484-3
I'm guessing that your first clue that this specimen was worth a closer look was that this skin sure is ridiculously intact for a lizard molt.
ReplyDeleteThis is a very good point, but the total absence of any bones had folks guessing on the origin, the synchrotron imaging nails this for the first time.
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