Probably a spot where the rock was slightly less hard and got eroded.
Exposure mode: program (auto)
Metering Mode: matrix
Exposure time: 0.0012 s (1/800)
Aperture: f/5.6
Focal length: 10.4mm (35mm equivalent: 28mm)
ISO: 125
Flash: No
File size: 9153720 bytes
Camera maker: SONY
Camera model: DSC-RX100
Resolution: 5472 x 3648
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