unmetamorphized

adjective1

1. •
   Not metamorphosed; referring to rocks or sediments that have not undergone metamorphism, retaining their original mineral assemblage and texture. Often used in geological descriptions contrasting unmetamorphized material with metamorphic equivalents.

   • The Avalon terrane appears as a block to be relatively undeformed and unmetamorphized during the Variscan orogeny. — 1990