1935 W. J. McCallien in B. 42 426 (caption) The arrows indicate direction of younging.
1972 28 Apr. 431/2 The eastward younging of plutons was taken to indicate an eastward migration of the downwelling plate margin.
2013 M. Nemčok et al. in W. U. Mohriak et al. 538/1 The westward younging of basal sediments can be demonstrated on the Brazilian side of the system.