This story from Nature is just amazing.
Mammoth tusks show up meteorite showerMay I recommend that you take a reinforced umbrella if you venture outside on Thursday night. See related story here about the Geminids.
Fossils could provide a new gold mine for micrometeorite hunters.
Bullet-like pieces of what is thought to be an ancient meteorite shower have been found embedded in mammoth tusks and bison bone. The discovery of the 2–5 millimetre holes left by meteorites opens a window into a impact event thought to have happened over Alaska and Russia tens of thousands of years ago. And it could provide a whole new way to chart impacts from space.
The fragments, found in seven mammoth tusks and the skull and horns of a Siberian bison, match the geochemical composition of iron meteorites. "We think that the micrometeorites came from an air-burst of a meteor 30,000 to 34,000 years ago," says Richard Firestone, co-author of the study and a chemist at the Lawrence Berkeley National Laboratory in California. "We think a wave of meteoric material sprayed the region."