dinobird talk uwe bergmann 10 20 12
TRANSCRIPT
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Uwe Bergmann
SLAC National Accelerator
Laboratory
2012 California Science Education Conference,
San José, CA, October 20, 2012
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Hermann von Meyer
(1801-1869)
August 15, 1861:
‘From the lithographic shale in
Solnhofen, Bavaria I was informed
about the slab and counter slab of a
fossil, which with great clarity can
be evidenced as a feather that is not
distinguishable from bird feathers. In
the very well known organization of
pterodactyls, there is nothing known
that could be concluded as a
plumage; this would therefore be the
remains of a bird of the pre-tertiary.’
Meyer, H. von (1861): Vogel-Federn und Palpipes priscus von Solenhofen. Neues Jahrbuch für Mineralogie,
Geognosie, Geologie und Petrefakten-Kunde 1861: V + 561 [Article in German].
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ἀρχαῖος (archaīos) = ancient
πτέρυξ (ptéryx) = feather
Hermann von Meyer
(1801-1869)
Meyer, H. von (1861): Archaeopteryx litographica (Vogel-Feder) und Pterodactylus von Solenhofen.
N. Jhb. Mineralogie, Geognosie, Geologie und Petrefakten-Kunde 1861: V + 678 - 679 [Article in German].
September 30, 1861:
‘Following my letter from August 15, I can now
report that I have studied the feather from
Solnhofen in detail and I came to the conclusion
that it is a true fossilization of the lithographic shale
and in complete agreement with a bird feather. At
the same time I have received news from Mr.
Justice Councilor Witte, that an almost complete
skeleton of an animal covered with feathers was
found. Compared to living birds it shows some
differences. I will publish the feather that I studied
with an exact drawing. For the description of the
animal I suggest the name Archaeopteryx
lithographica.’
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W. Nichols, Munich
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Hou L., Zhou Z., Gu Y., Zhang H., 1995, "Confuciusornis sanctus, a new Late
Jurassic sauriurine bird from China", Chinese Science Bulletin, 40: 1545–1551
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Confuciusornis
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Confuciusornis
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Confuciusornis sanctus
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Archaeopteryx
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Thermopolis Archaeopteryx
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Most of what we learn about fossils comes from the
fossilized bones and remaining imprints from soft tissue.
Do fossils contain more than is visible by the eye?
- What about the `Chemical Fossil?
- Are chemical elements that make up the living organism
still preserved after more than 100 million years?
- What can we learn about the chemistry of the fossilized
animal in comparison with related existing species?
- What can we learn about the fossilization process?
- Can we reveal soft tissues and possibly their coloration?
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Wilhelm Conrad Röntgen
1845-1923
First X-ray
Image 1895
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Inside of
an atom
Electron
Nucleus
Orbit
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Ca Fe Zn Pb
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25.00m
pinhole
Wiggler
(54 pole, 1T) M
0 M1
Si mono
slit slit
13.86m 18.80m
collimator
slit
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Manganese
Inorganic
precipitates
(Pyrolusite)
typical for
limestone
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Bromine
Synthetic fill
Curation
artefacts
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Chlorine
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56
Copper
Trace copper
associated
with the bone
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Zinc
We can
detect zinc
associated
with the bone
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Modern gulls have zinc levels in bone of approximately
100 ppm (parts per million).
Forensic and palaeontological studies have shown zinc
may be conserved in bone over millions of years
Zinc in Archaeopteryx skull is 50 ppm, twice as high as the
sedimentary matrix, suggesting this is the residue of the
original trace metal and that Archaeopteryx had zinc and
copper body levels similar to modern birds!
This is of great interest, because zinc and copper are critical
‘minerals’ for bird health. We can now infer that this was
probably the same for the first bird!
We did not find any trace metals in the feathers.
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Phosphorous
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Phosphorous
Feather shafts
are visible!
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Sulfur
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Archaeopteryx bone chemistry was similar
to modern birds (at least zinc and copper)
Sulfur is a key component of feather
protein, and phosphorous is known to be
present at trace levels as well.
Point analyses show that the phosphorous
and sulfur levels measured in the fossil
shafts are LOWER than levels in modern
feather shafts.
Original soft tissue chemistry has survived
but is invisible in ordinary light!
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Confuciusornis sanctus
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Ca
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Cu Ca
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Zn S
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EXAFS to determine Cu coordination
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Confuciusornis sanctus
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Confuciusornis sanctus
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Archaeopteryx bone chemistry was similar to
modern birds (at least zinc and copper)
Feather chemistry can be resolved for the first
time despite study for over 150 years!
Synchrotron XRF can map trace organometallic
biomarkers in Confuciusornis sanctus
Feather coloration may be determined even when
physical evidence for feathers is lacking
SRS-XRF and X-ray spectroscopy are powerful non-
destructive tools for studying fossils
We think that this is just the beginning
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U. Bergmann, R. W. Morton, P. L. Manning, W. I. Sellers, S. Farrar, K. G.
Huntley, R. A. Wogelius, and P. Larson, Proceedings of the National
Academy of Science, 107, 9060-9065 (2010).
R. A. Wogelius, P. L. Manning, H. E. Barden,N. P. Edwards,S. M. Webb,4
W. I. Sellers,K. G. Taylor, P. L. Larson, P. Dodson, H. You, L. Da-qing, and
U. Bergmann, Science 333, 1622-1626 (2011).
Many images were taken from Peter Wellnhofer: Archaeopteryx – Der
Urvogel von Solnhofen”, Verlag Dr. Friedrich Pfeil, Munich, Germany,
ISBN 978-3-89937-076-8 (2008)
Work is part of a National Geographic special “Jurassic CSI’ (Episode 3 ‘IN
LIVING COLOR’ and Episode 6 ‘SKIN DEEP”)
Berlin Archaeopteryx (counterpart) and holotype feather were scanned in
December 2010 at SLAC, publication is coming up
Ryan Carney et al, Nature, 637 (2012)
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Roy Wogelius (Manchester, geochemistry guru)
Phil Manning (Manchester, palaeo-wizard)
Bill Sellers (Manchester, bio-statistician on call)
Holly Barden, Nick Edwards (Manchester, the sleepless)
Pete Larson (Black Hills Institute, fossil hunter)
Sam Farrar (Black Hills Institute, deputy fossil hunter)
Bob Morton (CWM Institute, x-ray and fossil lover)
Ken Huntley (CWM Institute, image processing fanatic)
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Martin George and Alex Garachtchenko
(software and readout for rapid scanning)
David Day, Bart Johnson, J.R. Troxel,
Tom Hostettler, Tom Rabedeau (X-rays)
Jeff Maske (machining)
Matthew Latimer, Allyson Aranda,
Erik Nelson (detectors)
Andy Prado (electrical power)
Kelen Tuttle, Brad Plummer, Gregory Stewart
and many more……..
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THANK YOU
manganese = blue
calcium = red
zinc = green