Scanning electron microscopy fossils

In recent work, supported by the Fossil Fuels Division of the U.S. Department of Energy, we have extended the range of exposure conditions for carbon deposition by CO and C2H4 decomposition on Ni/A O surfaces and more fully explored the nature of such deposits. The TPSR studies with 1 atm Hj as reactant were also extended by studies with 0.03 atm I O In He diluent as the reactant gas. The bulk carbon deposits produced by CO or C2H. exposure were also examined with x-ray diffraction and transmission and scanning electron microscopy so that the reactivity of each form of carbon was Identified with Its morphology. 

Williams, A. (1971) Scanning electron microscopy of the calcareous skeleton of fossil and living brachiopoda. In Heywood (ed.) Scanning Electron Microscopy. Systematic and Evolutionary Applications (London Academic Press), pp. 37-66. 

Smith, M.M. (1979) SEM of the enamel layer in the oral teeth of fossil and extant crossopterygian and dipnoan fishes . Scanning Electron Microscopy, 2, 483-90. 

Plate 2. A transmission electron microscopy of the final resistant material after chemical treatments of the Cambridge strain (A race) all the cell contents have disappeared, the empty areas are surrounded by successive PRR-composed outer walls low). B scanning electron microscopy of a B. braunii colony in a recent (40,000 years) sediment core from East Africa the cell contents have been entirely removed, on the contrary the outer walls are well preserved. C UV fluorescence microscopy of fossil colonies of B. braunii from an immature Permian (ca 180-10 years) sedimentary rock from Australia the general organization of the colonies is still well recognizable. Scale bars A 1 pm, B and CIO pm. By courtesy of Dr. Berkaloff, ENS Paris (A), Dr. Coute, Museum Paris (B) and Dr. Peniguel, SNEA Pau (C)... 

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