Thanks to Google Earth for the distribution of the above satellite images.
These clearly show that earthquakes have been a feature of the area for a considerable time, hence the "earthquake" style of building with interlocking stones such as found at Sacsahuayman in Peru.
Some of the hilltops have concentric ringed walls (not unlike those of Atlantis) and perhaps in memory of the ringed mountain at Pampa Aullagas. Others may have been ancient hill forts with ringed walls, although it is not possible to tell from the photos whether some of these lines are actually walls or irrigation channels. Later resolution photos seem to suggest there are in fact concentric irrigation chanels surrounding many hilltops. Some are found in sites where the "geoglyph" system of agriculture is also found (named "geoglyph" by David Flynn who brought them to the public attention about two years ago when first seen on lower resolution photos) - others are found in conjunction with a contour-like system of small irrigation channels.
Some of the fort-like hilltops appear very ancient and the other agricultural system seems perhaps built over them at a later date - another detail to be investigated on the trail of Atlantis in Bolivia - was there indeed a lost civilisation before a great flood and cataclysm which also sank a culture beneath Lake Titicaca - the evidence certainly appears to be so.

See also contours forms/irrigation channels on Peruvian side of Altiplano
See also contours forms/irrigation channels on Bolivian side of Altiplano
See also "geoglyph" and other agricultural formations in the Oruro and Tiwanaku/La Paz regions
See also earthquakes page for Oruro and Tiwanaku/La Paz regions
See also canals gallery for views of canals in the Oruro region

J.M.Allen 14th Nov 2009

atlantisbolivia.org