surfacial

English

surfacial (not comparable)

Alternative spelling of surficial
- 1986, G[anpat] S[ingh] Roonwal, The Indian Ocean: Exploitable Mineral and Petroleum Resources, Berlin […]: Springer-Verlag, →ISBN, page 51:
  Cassiterite, rutile, ilmenite, zircon, monazite, magnetite, barite, lime, sand, and gravel are the chief surfacial materials which occur as placers and have been for economical recovered purposes from the marine environment.