Different, but contemporaneous and juxtaposed, sedimentary rocks. Terrigenous facies are accumulations of particles eroded from older rocks and transported to the depositional site. Biogenic facies are accumulations of whole or fragmented shells and other hard parts of animals. Chemical facies result from precipitation of inorganic material from solution. The shapes and characteristics of facies may change as conditions change over time.
This entry comes from Encyclopædia Britannica Concise.
For the full entry on sedimentary facies, visit Britannica.com.
Seen & Heard
What made you look up sedimentary facies? Please tell us what you were reading, watching or discussing that led you here.