saprolitic
/ˌsæproʊˈlɪtɪk/Definitions
1. noun
Relating to or being the partial or complete breakdown of rocks into soil.
“The soil was saprolitic, with a mix of clay and small rock fragments.”
2. adjective
Relating to or being the partial or complete breakdown of rocks into soil.
“The geologist studied the saprolitic rocks in the area.”