NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY NATURAL HISTORY MUSEUM, LONDON / SCIENCE PHOTO LIBRARY
Puddingstone is a conglomerate sedimentary rock composed of rounded pebbles cemented together by a younger matrix of rock. Despite a superficial similarity to concrete, is entirely natural. Puddingstones derive their name from the manner in which the embedded pebbles resemble the plums in a Christmas pudding.
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