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单词 palimpsest
释义
palimpsest

Astronomy
  • An impact crater whose topography has been smoothed by glacier-like flow of the surface. The term was coined for features on the icy surfaces of Ganymede and Callisto. Palimpsests there consist of bright circular features, sometimes at the centre of concentric rings.

    palimpsest http://photojournal.jpl.nasa.gov/catalog/PIA01659


Geology and Earth Sciences
  • A landscape that bears the imprint of two or more sets of geomorphological processes. For example, much of the Sahel region of Africa shows land-forms resulting from former wet and dry episodes. The word is derived from the Greek palimpsestos, ‘to rub smooth again’, and is also used for a re-used parchment, paper, or ornamental brass whose original writing or engraving has been only partially erased and for a sedimentary structure in which one set of trace fossils has been partly overwritten by another. See relaxation.


Geography
  • This is a parchment from a scroll or book from which the text has been scraped or washed off, and which can be used again. The writing was usually washed using milk and oat bran. With the passing of time, the faint remains of the former writing would reappear enough so that scholars could discern the text (called the scriptio inferior), and decipher its meaning. Geographers really like the analogy of the palimpsest; Graham (2010) Tijdschrift Econ. 101, 4, 422 writes ‘All places are palimpsests. Among other things, places are layers of brick, steel, concrete, memory, history, and legend. The countless layers of any place come together in specific times and spaces and have bearing on the cultural, economic, and political characteristics, interpretations, and meanings of place’. In geomorphology, palimpsest landscapes are composed of a mosaic of active and relict (inactive) landforms of different ages. See Kleman (1992) Geografisk A, 74, 4, 305.


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