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 form]

Anotations

Scope note:

Repetitive sedimentary rock stratification-formed over the course of a year reflecting seasonal sedimentation variations, usually alternating finer and coarser layers (or ‘varves’) of sand or clay which often exhibit contrasting colors.