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Re: Great Heaping Gobs of New Papers (short!)

Lockley, M., Matsukawa, M., Ohira, H., Li, J., Wright, J., White, D., and
Chen, P. 2006. Bird tracks from Liaoning Province, China: new insights into
avian evolution during the Jurassic-Cretaceous transition. Cretaceous
Research 27(1):33-43. doi: 10.1016/j.cretres.2005.10.007.

ABSTRACT: Tracks of shorebird-like species from a small outcrop in the upper
part of the Tuchengzi Formation at Kangjiatun, in the Beipiao area, Liaoning
Province, may be the oldest bird tracks known from China. Formerly
considered Late Jurassic in age, new fission track dates give an age of
145.9 Ma for ash beds associated with dinosaur track-bearing beds from the
middle part of the Tuchengzi Formation outcrops at a nearby locality. Thus,
the age appears to be close to the Jurassic-Cretaceous
(Tithonian-Berriasian) boundary.

Indeed: 145.5 +- 4.0 Ma ago http://www.stratigraphy.org/gssp.htm. That's great! That (potentially) makes FOUR more or less terrestrial J-K boundary sediment outcrops around the world now. :-)

The precise age of the bird track-bearing
beds has not been determined, but is unlikely to be younger than about 139
Ma, based on dates for the upper part of the Tuchengzi Formation.

Even with these two dates alone, the Tuchengzi Fm spans the entire Berriasian! Berriasian-Valanginian boundary: 140.2 +- 3.0 Ma ago http://www.stratigraphy.org/gssp.htm.

Clack, J.A. 2006. The emergence of early tetrapods. Palaeogeography, Palaeoclimatology, Palaeoecology 232(2-4):167-189. doi: 10.1016/j.palaeo.2005.07.019.


Antunes, M.T., Balbino, A.C., and Ginsburg, L. 2006. Miocene Mammalian
footprints in coprolites from Lisbon, Portugal. Annales de Paléontologie
92(1):13-30. doi: 10.1016/j.annpal.2005.09.002.

ROTFL! Quite a narrow discipline. :-)