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Home > Science Photo Library > Images Dated > 2011 > May > 18 May 2011

Images Dated 18th May 2011

Available as Framed Prints, Photos, Wall Art and Gift Items

Choose from 34 pictures in our Images Dated 18th May 2011 collection for your Wall Art or Photo Gift. Popular choices include Framed Prints, Canvas Prints, Posters and Jigsaw Puzzles. All professionally made for quick delivery. We are proud to offer this selection in partnership with Science Photo Library.


Volcanic dyke Featured 18 May 2011 Print

Volcanic dyke

Volcanic dyke. Tertiary volcanic intrusion in a rock face. This rock formation is commonly known as a dyke. Dykes are sheets of rock, usually igneous, that cut across the bedding or structural planes of the host rock. Igneous (volcanic) dykes form as molten rock (magma) flows between cracks in the host rock and then cools and solidifies. An igneous dyke normally intrudes in a more or less vertical position and some dykes of this nature extend for considerable distances

© DIRK WIERSMA/SCIENCE PHOTO LIBRARY

Fossilised stromatolites Featured 18 May 2011 Print

Fossilised stromatolites

Fossilised stromatolites. Stromatolites are mineralised microbial communities formed from microorganisms, especially blue-green algae (cyanobacteria). Over an extended period of time (often thousands of years) the algae trap detritus and sediment, forming large, living rafts known as microbial mats. The secretion of calcium carbonate by the algae causes the mats to mineralise, forming the rock-like structures seen here. Stromatolites are known as living fossils, because the process of mat formation and mineralisation continues today

© DIRK WIERSMA/SCIENCE PHOTO LIBRARY