microtephra

English

Etymology

From micro- +‎ tephra.

Noun

microtephra (uncountable)

1. (geology, paleontology) Microscopic deposits of tephra.
   • 2011, Chris Stringer, The Origin of Our Species, Penguin, published 2012, page 45:

     This microtephra may be ejected into the upper atmosphere and travel for many thousands of miles […].