Harry R. Schwartz

Code writer, sometime Internet enthusiast, attractive nuisance.

The author at the Palais du Luxembourg in Paris, November 2022. hacker news gitlab sourcehut pinboard librarything 1B41 8F2C 23DE DD9C 807E A74F 841B 3DAE 25AE 721B


British Columbia



Pre-Columbian Geoglyphs


Published .
Tags: history, science.


In general, the geometric figures are formed by a ditch approximately 11m wide, currently 1-3m deep, with adjacent 0.5-1m high earthen banks, formed by deposition of the excavated soil. Ring ditches have diameters that vary from 90 to 300m. The circular structures are more common in the south, while composite and rectangular structures become more frequent as one moves north (see Figure 2). When there are two or more structures, they are usually connected by embanked roads. Some of the single rectangular structures may have short roads coming out of their mid-sides or corners. Composite figures include a rectangle inside a circle or vice versa.

Pre-Columbian geometric earthworks in the upper Purús: a complex society in western Amazonia, Pärssinen, Schaan & Ranzi

Pretty cool paper; they used Google Earth to find geoglyphs!

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