Sentinel Stone near Tandil, Argentina

June 10, 2024

Piedra Centinela. Tandil

Photographer: Cristian Lopez
Summary Author: Cristian Lopez

The granite sentinel featured here stands almost 23 ft (7 m) high and is supported on an extraordinarily small base for its huge volume -- estimated at 72 tons. Its geological history tells us that when the  Tandilla system of mountain ranges was formed, just over 2,300 million years ago, its crystalline basement, in transition from pressurized, molten liquid to solid rock, left dropstones on rare occasion, such as this one. Its smoothed appearance is a result of the passage of time, constant erosion and various tectonic upheavals. Photo taken on January 8, 2024.

Photo Details: Canon T3 camera; Canon 18/55 in 29 mm lens; F: 11; ISO 100; 1/200 seconds exposure; processing with Photoshop.

Tandil, Buenos Aires, Argentina Coordinates: -37.32167, -59.13316

Related Links:
Little Red Canyon Hoodoo
The Tandilia System of Argentina