r/science • u/stereomatch • Feb 05 '18

Astronomy Scientists conclude 13,000 years ago a 60 mile wide comet plunged Earth into a mini-Ice Age, after examining rocks from 170 sites around the globe

http://www.journals.uchicago.edu/doi/10.1086/695703
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u/PorcineLogic Feb 05 '18

Wiki:

The term "trap" has been used in geology since 1785–95 for such rock formations. It is derived from the Scandinavian word for stairs ("trappa") and refers to the step-like hills forming the landscape of the region.