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(2011), and describes in detail the geochemistry and isotope systematics of some regions within bone 22799-D, disturbed by one or more post-fossilization uranium-enrichment events. It was found that these two suites of bones each had distinctive concentrations of U and REE: very low U and high REE for Kirtland samples, and high U and low REE for Ojo Alamo samples.

The discussions in that paper clearly demonstrate that the low Pb domains typically do preserve dates in accordance with the well-constrained depositional age of the host rock, and thus provide an accurate estimate of the fossilization date. C: Hadrosaur femur from San Juan River site of Fassett (2009); photograph by S. These authors accordingly concluded that these suites of bones had been mineralized while immersed in distinctly different mineral-bearing solutions, and had retained their original mineral fingerprints ever since, indicating that the Paleocene dinosaur bones of the Ojo Alamo had not been reworked from Cretaceous strata.

(2012), the Pb-method is the well-established and preferred method for making such corrections in sample materials that contain abundant common lead using in-situ ion beam and laser ablation techniques (e.g., Williams, 1998; Storey et al., 2006).

A manuscript now in preparation by Heaman, Simonetti, and Fassett (Heaman, 2012, personal commun.) will provide a more detailed description of the procedures used by Fassett et al. (2002) and Fassett (2009) tackled the possible reworking of Cretaceous Kirtland Formation dinosaur-bone fossils into Paleocene Ojo Alamo Sandstone strata by conducting chemical analyses of 15 bone samples from each of these formations.

Uranium typically adsorbs preferentially in dinosaur bones buried within the local water table (Gillette, 1994), and many elements are drawn from surrounding sediments during fossilization (Goodwin et al., 2007, and references therein).

Silicon-32 methods may be used to date siliceous sediments and sponges, groundwater and glacier ice.

Decades of fieldwork above the Cretaceous-Paleogene boundary in the Western Interior has produced dozens of articulated skeletons and/or skulls of champsosaurs, crocodilians, lizards, turtles, and mammals firmly in place in Paleocene sediments.

To date, no dinosaur skulls, skeletons, or nests—fossils unlikely to survive reworking unrecognized—are recorded in museum collections across North America from these or contemporaneous formations ( ucmpdb.berkeley.edu; muse.museum.montana.edu/paleodb_pub/; si.edu/search/paleo/).

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