Document Type

Article

Publication Date

2-13-1979

Abstract

The lunar farside crater Necho (30 km diameter) displays intricate morphalogical and structural characteristies. The highland setting provides a complex impact site when compared with the relatively uniforn stting of mare craters. Therefore, the effects of pre-impact topography and structure play a dominant role in Necho's formation and modification. Necho's bright ejecta, extensive rays, fresh morphology, and lack of superposed craters indicate that it is extremely young. The asym- metric distribution of ejecta materials may be due O substrate effects, topographic shadowing, or oblique impact. Necho's interior S divided into five physiographic units based on notphologic ifferences: `three 'floor' units (Necto does not display true flat floor), one hilly sentral unit, and the wall anit which includes terraces and smooth walls. Thê interior the crater also xhibits an unusual asymmetry the prevalence terraced units on the western wall. Interior norphology and terrace orientations are probably the result of re-impact effects. tructural and topographic orientations associated with three large pre-existing degrađed craters dominate the impact site.

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