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Because of the absence of any meaningful fossil record, the evolutionary
relationships among the flowering plant orders must be inferred from their
present structural similarities. Characteristics of the flowers, such as numbers,
fusion of parts, ...
When this happens in humid areas the dunes become overgrown by vegetation,
rapidly assuming a "fossil" status. Subsequently, the vegetative cover may
deteriorate because of climatic changes, lowering of groundwater levels, or other
Fossil dunes on the present land surface can usually be related to a specific
source, such as a glacial outwash surface, an alluvial river plain, or a shoreline.
Thick deposits of loess on only one side of a large river strongly suggest that the
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review