Mudstone

Mudstone (ᒪᕋᕕᓂᖅ ᐅᔭᕋᖑᖅᓯᒪᔪᖅ)

Mudstone: black shaley to slatey mudstone, ungraded. (ᒪᕋᖅ)

Metamorphosed mudstone: heat and pressure cause new minerals (e.g., garnet) to form from the original clay. (ᑎᓯᓂᖅᐹᖅ ᒪᕋᕕᓂᖅ)