Journal
MICROSCOPY AND MICROANALYSIS
Volume 20, Issue 1, Pages 305-312Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1017/S1431927613014025
Keywords
propagation phase-contrast tomography; microtomography; nanotomography; multiscale approach; fossil plants; flowers; Cretaceous
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Funding
- Ministerio de Ciencia e Innovacion of the Spanish government [CGL2009-11838/BTE, CGL2011-27869, CGL2011-23948 3, CGL2012-35199]
- Catalan Government [SGR2009-1451]
- [CNRS-UMR6118]
- [CNRS-UMR5276]
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A multiscale approach combining phase-contrast X-ray micro- and nanotomography is applied for imaging a Cretaceous fossil inflorescence in the resolution range from 0.75 m to 50 nm. The wide range of scale views provides three-dimensional reconstructions from the external gross morphology of the inflorescence fragment to the finest exine sculptures of in situ pollen. This approach enables most of the characteristics usually observed under light microscopy, or with low magnification under scanning and transmission electron microscopy, to be obtained nondestructively. In contrast to previous tomography studies of fossil and extant flowers that used resolutions down to the micron range, we used voxels with a 50 nm side in local tomography scans. This high level of resolution enables systematic affinities of fossil flowers to be established without breaking or slicing specimens.
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