Wiktionary
n. A large-scale drawing made on the ground by scratching or arranging lines of stones etc
Wikipedia
A geoglyph is a large design or motif (generally longer than 4 metres) produced on the ground and typically formed by clastic rocks or similarly durable elements of the landscape, such as stones, stone fragments, live trees, gravel, or earth. A positive geoglyph is formed by the arrangement and alignment of materials on the ground in a manner akin to petroforms, while a negative geoglyph is formed by removing patinated clasts to expose unpatinated ground in a manner akin to petroglyphs.
Usage examples of "geoglyph".
We must look forward to the day when the WormCam's delvings reach as far as the building of the Pyramids, Stonehenge, the Nazca geoglyphs and other sources of 'wisdom' or 'mystery.