Shatter cones are rare geological features that are only known to form in the bedrock beneath meteorite impact craters or underground nuclear explosions. They are evidence that the rock has been subjected to a shock with pressures in the range of 2-30 GPa. ==Morphology== Shatter cones have a distinctively conical shape that radiates from the top (...
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http://en.wikipedia.org/wiki/Shatter_cone
(from the article `impact crater`) Another such change is the development of shatter cones. These are peculiar external fracture surfaces in which closely-spaced `grooves` seemingly ... ...glass, and meteorite fragments are heavily modified over time by erosion and weathering, the identification of astroblemes is based chiefly...
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http://www.britannica.com/eb/a-z/s/77
A conical fragment of rock with regular thin grooves (striae) that radiate from the top (apex) of the cone. Shatter cones range in size from less than one centimeter to more than one meter across and are formed as a result of the high pressure, high velocity shock wave produced by an impacting meteo...
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http://www.daviddarling.info/encyclopedia/S/shatter_cone.html
Striated conical fracture surfaces produced by meteorite impact into fine-grained, brittle rocks such as limestone.
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A distinctively striated conical structure in rock, ranging from a few centimeters to a few meters in length, believed to have been formed by the passage of a shock wave following meteorite impact.
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https://www.encyclo.co.uk/local/22327
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