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?