Origin of surficial
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for surficial
The zinc oxide minerals in the surficial zone also are sometimes colored yellow by small amounts of greenockite.The Economic Aspect of Geology
C. K. Leith
My foot-rule, my rough scale plans and piled-up figures of cubic capacity and surficial area carried all before them.A Floating Home
Surficial, sur-fish′al, adj. formed on the surface, as opposed to Subterranean.