Weathered “boulder” – these boulders are not conventional weather-worn rock, but were formed by concretion around some seed object. In fact, their origin has been linked to marine reptiles of the Jurassic period. These boulders erode from the inside out. The one in the foreground is 18 metres in circumference; another large boulder is seen partially exposed from the vertical face of mudstone and numerous others litter the rockshelf.
Shag Point (Matakaea), South Island, New Zealand
(ref fotoWERNER 3H1002.8731)
Nikon D300 | Nikon 18-200VR @ 60mm
1/50s f/18 ISO200
Featured in Volcanoes, Earths Geology & Atmosphere (23 March 2010)