Sunrise at Moeraki - a photo on Flickriver

Sunrise at Moeraki

            The Moeraki Boulders are concretions created by the cementation of the Paleocene mudstone of the Moeraki Formation, from which they have been exhumed by coastal erosion. The main body of the boulders started forming in what was then marine mud, near the surface of the Paleocene sea floor. This is demonstrated by studies of their composition; specifically the magnesium and iron content, and stable isotopes of oxygen and carbon. Their spherical shape indicates that the source of calcium was mass diffusion, as opposed to fluid flow. The larger boulders, 2 metres (6.6 ft) in diameter, are estimated to have taken 4 to 5.5 million years to grow while 10 to 50 metres (33 to 164 ft) of marine mud accumulated on the seafloor above them. After the concretions formed, large cracks known as septaria formed in them. Brown calcite, yellow calcite, and small amounts of dolomite and quartz progressively filled these cracks when a drop in sea level allowed fresh groundwater to flow through the mudstone enclosing them
   

Taken in: New Zealand / Otago / Hampden (show map)

Taken on: October 22, 2016

Tags:

sun

rise

blouder

beach

canon

rock

ball

sphere

tide

sea

sand « less

Sets appears in: • Interesting New Zealand • New Zealand Landscapes

Groups appears in: • Sunrise & Sunset • Sunrise, Sunset more » • Official National Geographic Group • Planet Earth Sunrise and Sunsets (P1, A+F1 OR MORE) • Sunset of the Day! • Canon EOS 5DS and 5DSR Owners Photographs « less

Camera: Canon EOS 5DS R, f/2.8, 2 sec, 55mm, ISO 100 (more info) (hide info)

Camera:	Canon EOS 5DS R
Lens:	EF24-70mm f/2.8L II USM
Aperture:	f/2.8
Exposure Time:	2
Focal Length:	55mm
ISO:	100
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Manual
Exposure Mode:	Manual
Metering Mode:	Multi-segment
White Balance:	Manual
Color Space:	sRGB
Software:	Adobe Photoshop Lightroom 6.0 (Windows)
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