LM of fossil wood

LM of fossil wood


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Light micrograph (transverse section) of fossil wood from one of the first forest trees Callixylon newberryi. The sample was found in New Albany shale from the Upper Devonian period in Indiana, USA. These first forest trees, known as progymnosperms, are ancestral to the living gymnosperms (see B500/056 for living example), of which the most familiar are the conifers. The image was obtained with the Nomarski differential interference contrast technique. Magnification: x40 at 35mm size, 80 at 6x7cm size.

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