Definition of "younging"

younging

noun
uncountable
1. (geology) The direction in which stratigraphy becomes younger, for a particular formation
  Quotations
  Where well preserved, the pillows show cuspate lower boundaries and lobate upper contacts, defining stratigraphic younging (Fig. 3 E).
  2001 May 11, Timothy M. Kusky et al., “The Archean Dongwanzi Ophiolite Complex, North China Craton: 2.505-Billion-Year-Old Oceanic Crust and Mantle”, in Science‎, volume 292, number 5519, pages 1142–1145
verb
1. present participle and gerund of young