High Quality Content by WIKIPEDIA articles! A geoglyph is a drawing on the ground, or a large motif, (generally greater than 4 metres) or design produced on the ground, either by arranging clasts (stones, stone fragments, gravel or earth) to create a positive geoglyph (stone arrangement/alignment, petroform, earth mound) or by removing patinated clasts to expose unpatinated ground (negative geoglyph). Recently some geoglyphs have been discovered in the Amazonia Jungle, in Brazil, which led to claims about unknown civilizations that may have inhabited the area in the past.

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