MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY MARTYN F. CHILLMAID / SCIENCE PHOTO LIBRARY
Red and white sandstone. This detrital sedimentary rock sample contains quartz and feldspar grains and some white mica. Part of the argillaceous (clay-containing) cement-like bulk of the rock is coloured by iron oxide (reddish-brown). This specimen dates from the Eocene (37 million years ago), and formed on the bottom of a lake. It is used as a construction stone. This specimen is part of the Geoscope geological park, located between Les Monts-Vert and Albaret-Sainte-Marie, central France.
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