Today is Nicolas Steno's 374th birthday. For those of you who are unsure of who Steno is/was... I shall enlighten:
Steno was a scientist, but more importantly he was a geologist (and palaeontologist). He identified the relationship between glossopetrae (tongue stones) and the teeth of sharks to be one and the same, adding to an argument established by the late Fabio Colonna; the difference being, Steno noted differences between living shark teeth and those known to be glossopetrae (Owen, 2009). He is the father of the law of superposition, the principle of original horizontality, and the principle of lateral continuity; a basis for stratigraphy.
Owen, D. 2009. Shark: In peril in the Sea, Allen & Unwin, Australia
In Dinosaur News:
PLoS ONE shared "New Ophthalmosaurid Ichthyosaurs from the European Lower Cretaceous Demonstrate Extensive Ichthyosaur Survival across the Jurassic–Cretaceous Boundary".
In brief, a 130 MY old ichthyosaur (Acamptonectes densus) was discovered in Braunschweig, Germany. The sparkling, diamond-in-the-rough snippet of information you should dust off and take home should be that ichthyosaurs are "traditionally" from the Jurassic period; this specimen dates to the Cretaceous. How the ichthyosaur survived the JK event (mass(?) extinction) is beyond me... Oh, but wait! A.densus didn't survive the JK event... essentially, it, among other ophthalmosaurines and platypterygiines continued to thrive: "...diversity and disparity was reasonably high".
Anyway, to clarify what's so important about the "re-writing of pre-history" and what part this ichthyosaur played, I'd recommend reading the excellent ramblings of Darren Naish's blog post (co-author of the PLoS ONE article). There are some wonderful diagrams and anecdotal tidbits within.
Steno was a scientist, but more importantly he was a geologist (and palaeontologist). He identified the relationship between glossopetrae (tongue stones) and the teeth of sharks to be one and the same, adding to an argument established by the late Fabio Colonna; the difference being, Steno noted differences between living shark teeth and those known to be glossopetrae (Owen, 2009). He is the father of the law of superposition, the principle of original horizontality, and the principle of lateral continuity; a basis for stratigraphy.
So, happy birthday, Nic! You old dinosaur.
Owen, D. 2009. Shark: In peril in the Sea, Allen & Unwin, Australia
In Dinosaur News:
PLoS ONE shared "New Ophthalmosaurid Ichthyosaurs from the European Lower Cretaceous Demonstrate Extensive Ichthyosaur Survival across the Jurassic–Cretaceous Boundary".
In brief, a 130 MY old ichthyosaur (Acamptonectes densus) was discovered in Braunschweig, Germany. The sparkling, diamond-in-the-rough snippet of information you should dust off and take home should be that ichthyosaurs are "traditionally" from the Jurassic period; this specimen dates to the Cretaceous. How the ichthyosaur survived the JK event (mass(?) extinction) is beyond me... Oh, but wait! A.densus didn't survive the JK event... essentially, it, among other ophthalmosaurines and platypterygiines continued to thrive: "...diversity and disparity was reasonably high".
Anyway, to clarify what's so important about the "re-writing of pre-history" and what part this ichthyosaur played, I'd recommend reading the excellent ramblings of Darren Naish's blog post (co-author of the PLoS ONE article). There are some wonderful diagrams and anecdotal tidbits within.
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