Hierarchy classification:

1. top of the aat hierarchies
2. Materials Facet
3. Materials (hierarchy name)
4. materials (substances)
5. [materials by composition]
6. inorganic material
7. rock (inorganic material)
8. sedimentary rock
9. [sedimentary rock by composition]
10. argillaceous rock

Narrower term/s

• clay shale
• black shale (rock)

Anotations

Scope note:

Argillaceous sedimentary rock formed by the compaction of clay, silt, or mud; it may be gray, red, brown, or black. It is finely laminated and weak along planes allowing the rock to split easily.