Portal:Earth sciences/DYK/6


 * ...that a pit crater (example pictured), unlike an impact crater, is formed by the ground sinking over a void such as an emptied magma chamber or caldera?
 * ...that the late Paleozoic environment of the Chaco-Tarija sedimentary basin of Bolivia has been likened to that of present-day Labrador Sea?
 * ...that there was intense volcanic activity in Uruguay during the Cretaceous period about 130 million years ago?
 * ...that six prehistoric meteorite impacts have created large astroblemes affecting the geology of Saskatchewan?
 * ... that the Wairau, Awatere, Clarence and Hope faults, are the main active faults of the Marlborough Fault System, and carry most of the displacement on the Australian-Pacific plate boundary in northern South Island?
 * ... that a revolution in burrowing marks the base of the Cambrian period, and is followed by the Cambrian explosion of animal diversity?

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