SiO2 vs. Lichens

Section of a big quartz rock covered partly by map lichens (Rhizocarpon geographicum). Map lichens grow on naked siliceous, acidic rocks in montaneous areas. Their slow radial growth of the map lichen allows dating back certain events from when on the rock became exposed. Among others it is possible to date back lake level changes or monitor the speed of glacial retreat. With an estimated age of 8.600 years, a map lichen from the Artics is thought to be the oldest living organism on earth.

Camera: Canon EOS R

Lens: Canon RF 24-105 L IS

Location: Lower Austria

Date: Nov 2020

Focal Lenght: 50 mm

Exposure: 1/100 s

Aperture: F/22

ISO: 800

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