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Taphonomy and palaeoecology of Olduvai Bed-I (Pleistocence, Tanzania).
The interpretation of the palaeoenvironments is that the middle Bed-I faunas indicate a very rich closed woodland environment, richer than any part of the present-day savanna biome in Africa, changing to less rich woodland in upperBed-I with a trend towards more open and seasonal woodlands at the top of the series. Expand
XANES mapping of organic sulfate in three scleractinian coral skeletons
The presence and localization of organic sulfate within coral skeletons are studied by using X-ray absorption near edge structure spectroscopy (XANES) fluorescence. XANES spectra are recorded fromExpand
The two-step mode of growth in the scleractinian coral skeletons from the micrometre to the overall scale.
It is shown that in both "centres of calcification" and fibres, organic compounds are associated with the mineral material at a deep structural level, and the hypothesis can be made that multiple and long recognized specificities of coral skeletons are linked to this biochemically driven crystallization process. Expand
Associated water and organic compounds in coral skeletons: Quantitative thermogravimetry coupled to infrared absorption spectrometry
[1] Samples from coral skeletons belonging to six species have been submitted to thermogravimetric analysis in the temperature range between 20° and 550°C. Weight losses are interpreted on the basisExpand
Distribution of magnesium in coral skeleton
Ion micro-probe imaging of the aragonite skeleton of Pavona clavus, a massive reef-building coral, shows that magnesium and strontium are distributed very differently. In contrast to strontium, theExpand
The Environment Recording Unit in coral skeletons – a synthesis of structural and chemical evidences for a biochemically driven, stepping-growth process in fibres
A fibre growth model is proposed that places coral skeletons among the typical ''matrix mediated'' structures, where the crystal-like fibres are built by superimposition of few micron-thick growth layers. Expand
Microstructural and physico-chemical characterization of ‘centers of calcification’ in septa of some Recent scleractinian corals
‘centers of calcification’ appear to be a basic component in the development of corallian septal architecture and some changes are introduced in the current view concerning their role in skeletogenesis of Scleractinia. Expand
In situ chemical speciation of sulfur in calcitic biominerals and the simple prism concept.
High-spatial-resolution XANES maps for the different S species across adjacent prisms show that sulfate is the principal component in both the intraprismatic organic matrices and the outer membranes and confirm that the inner structures of the prismatic units are different for both genera. Expand
Compositional diversity of soluble mineralizing matrices in some recent coral skeletons compared to fine-scale growth structures of fibres: discussion of consequences for biomineralization and
Abstract In contrast to the purely crystalline model of the coral fibre, a transversal zonation is made visible within fibres by specific preparations (enzymatic or light acidic etchings). ThisExpand
Biominerals and Fossils Through Time
Fossils are essential to the reconstruction of the evolution of life and episodes in Earth history. Knowledge of biomineralization - the processes associated with the formation of mineralizedExpand