Fluorine Content of Microsaur Teeth from the Carboniferous Rocks of Joggins, Nova Scotia

Stevenson, John S.; Stevenson, Louise S.

doi:10.1126/science.154.3756.1548

Cited by 5 publications

(2 citation statements)

References 11 publications

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“…The standard used in the present study is the modern buried elephant femur in which the CO, content was previously determined by wet chemistry (Hassan, 1976 has an abnormally high F-concentration (3.96 percent) whereas the rest of the fossil bones have less than 1.9 percent and the fresh and modern bones contain less than 0.1 percent flouride (table 2). The fact that bone mineral dahllite may be converted into francolite because of fossilization, has been reported previously by Stevenson (1966).…”

Section: Introductionmentioning

confidence: 53%

Mineralogical Studies On Bone Apatite and Their Implications for Radiocarbon Dating

1977

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ABSTRACT. Infrared (IR) spectrophotometry and X-ray diffraction (XRD) were conducted on modern and fossil bone material from archaeological sites in the U S to determine post-mortem changes in bone apatite and to evaluate the effect of these changes on radiocarbon dating. IR absorption bands, XRD peak-broadening parameters, and XRD unit cell measurements indicated that during fossilization, bone apatite, a mineral similar to dahllite, was partially or completely recrystallized to francolite. Post-mortem changes involved then removal of some of the endogenous crystal carbonate both at surfaces and at internal OH-sites and introduction of exogenous carbonate into internal crystal P04 sites. Increased fluorine content accompanied carbonate substitution.Both the carbon isotopic composition and the amount of exogenous carbonate introduced into the apatite structure will affect the radiocarbon dating of bone apatite. Special sample pre-treatment may remove most of the substituted carbonate in some cases. Simulated experiments are suggested for a better understanding of the nature and mechanism of carbonate substitution in bone apatite for the removal of the exogenously substituted carbon and the improvement of radiocarbon dates.

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Section: Introductionmentioning

confidence: 53%

Mineralogical Studies On Bone Apatite and Their Implications for Radiocarbon Dating

1977

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“…William Dawson, in particular, whose work has been summarized by Falcon-Lang and Calder (2005), Calder (2006) and Falcon-Lang (2006), extensively collected and studied fossils from Joggins. Many of the more recent discoveries and taxonomic studies are of the vertebrates, mainly amphibians, including the extinct groups of the microsaurs and labyrinthodonts; (e.g., Carroll 1963Carroll , 1966Carroll , 1967Stevenson and Stevenson 1966;Stevenson 1967;Baird 1982;Godfrey et al 1987Godfrey et al , 1991Milner 1996;Reisz and Modesto 1996;Holmes et al 1998;Robinson et. al 2005;Holmes and Carroll 2010).…”

Section: Paleobiologymentioning

confidence: 99%

The Joggins Fossil Cliffs UNESCO World Heritage site: a review of recent research

Grey

Finkel

2011

atgeol

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The Joggins Fossil Cliffs UNESCO World Heritage Site is a Carboniferous coastal section along the shores of the Cumberland Basin, an extension of Chignecto Bay, itself an arm of the Bay of Fundy, with excellent preservation of biota preserved in their environmental context. The Cliffs provide insight into the Late Carboniferous (Pennsylvanian) world, the most important interval in Earth's past for the formation of coal. The site has had a long history of scientific research and, while there have been well over 100 publications in over 150 years of research at the Cliffs, discoveries continue and critical questions remain. Recent research (post-1950) falls under one of three categories: general geology; paleobiology; paleoecology. It provides a context for future work at the site. While recent research has made large strides in our understanding of the Late Carboniferous, many questions remain to be studied and resolved, and interest in addressing these issues is clearly not waning. Within the World Heritage Site, we suggest that the uppermost formations (Springhill Mines and Ragged Reef), paleosols, floral and trace fossil taxonomy, and microevolutionary patterns are among the most promising areas for future study. RÉSUMÉLe site du patrimoine mondial de l'UNESCO des falaises fossilifères de Joggins est situé sur une partie du littoral qui date du Carbonifère, sur les rives du bassin de Cumberland, qui est une prolongation de la baie de Chignecto, elle-même un bras de la baie de Fundy. L'endroit offre un excellent milieu de préservation de la faune et de la flore dans leur environnement. Les falaises donnent un aperçu du monde du Carbonifère tardif (Pennsylvanien), soit la période de l'histoire de la terre la plus importante pour la formation du charbon. Ces falaises ont fait depuis longtemps l'objet de travaux de recherche scientifique et plus de 100 publications y ont été consacrées au cours de 150 années de recherche. L'endroit suscite encore des découvertes et il soulève toujours des questions essentielles. Les travaux de recherche récents (depuis les années 1950) se répartissent en trois catégories: géologie générale; paléobiologie; et reconstitution des paléomilieux, en plus d'offrir des avenues pour les futurs travaux qui devraient s'y dérouler. Même si la recherche récente a largement contribué à une meilleure compréhension du Carbonifère tardif, de nombreuses questions demeurent sans réponse et commandent qu'on les étudie et les résolve et il est manifeste que l'intérêt pour ces questions est bien loin de s'amenuiser. Sur ce site du patrimoine mondial, nous soutenons que les futurs sujets d'étude les plus prometteurs seraient les formations supérieures (Springhill Mines et Ragged Reef), les paléosols, la taxonomie florale et des ichnofossiles, ainsi que les paramètres de microévolution.[Traduit par la redaction]

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Structure and Chemistry of Bone Mineral

Eanes

Posner

1970

Biological Calcification: Cellular and Molecular Aspects

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Fluorine Content of Microsaur Teeth from the Carboniferous Rocks of Joggins, Nova Scotia

Cited by 5 publications

References 11 publications

Mineralogical Studies On Bone Apatite and Their Implications for Radiocarbon Dating

Mineralogical Studies On Bone Apatite and Their Implications for Radiocarbon Dating

The Joggins Fossil Cliffs UNESCO World Heritage site: a review of recent research

Structure and Chemistry of Bone Mineral

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