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Can we distinguish human v. natural excavations?

Large geometric shapes are being discovered beneath the Amazon forest. Have the discoverers evaluated their origins correctly? If so, why? Is there any way to distinguish between artifacts caused by human and extraterrestrial agents?
Once Hidden by Forest, Carvings in Land Attest to Amazon’s Lost World By SIMON ROMERO January 14, 2012

RIO BRANCO, Brazil — Edmar Araújo still remembers the awe.
As he cleared trees on his family’s land decades ago near Rio Branco, an outpost in the far western reaches of the Brazilian Amazon, a series of deep earthen avenues carved into the soil came into focus.
These lines were too perfect not to have been made by man,” said Mr. Araújo, a 62-year-old cattleman. . . .
The deforestation that has stripped the Amazon since the 1970s has also exposed a long-hidden secret lurking underneath thick rain forest: flawlessly designed geometric shapes spanning hundreds of yards in diameter.

Alceu Ranzi, a Brazilian scholar who helped discover the squares, octagons, circles, rectangles and ovals that make up the land carvings, said these geoglyphs found on deforested land were as significant as the famous Nazca lines, the enigmatic animal symbols visible from the air in southern Peru.

“What impressed me the most about these geoglyphs was their geometric precision, and how they emerged from forest we had all been taught was untouched except by a few nomadic tribes,” said Mr. Ranzi, a paleontologist who first saw the geoglyphs in the 1970s and, years later, surveyed them by plane.

Hundreds of Geoglifos Discovered in the Amazon 2010.01.20

Geoglifos is the term applied in Brazil to geometric earthworks discovered after recent deforestation. Geoglyphs are not new in South American archaeology, but these are different—massive earthworks of tropical forest soil rather than desert surface alterations. The Amazon Geoglifos present geometric forms; circles, squares, ellipses, octagons, and more, with individual forms up to several hundred meters across. Some are connected by parallel walls. Their distribution spans hundreds of kilometers, and much of the area remains forested jungle.

POSTCARDS FROM THE AMAZON: Massive clues of Amazon area’s past 2010

The geoglyphs in Acre were made by digging ditches into the earth to create shapes like circles, squares, and diamonds. They are outlined by ditches up to 20 feet deep and range from 300 to 1,000 feet in diameter.

Squares

Circles

Ranzi geoglyphs Google search

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