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. sandstone
11. [sandstone by composition or appearance]
12. ferruginous sandstone

Anotations

Scope note:

A coarse, pebbly, or gritty rock found in certain areas of southern and eastern England; it contains a great deal of iron oxide and is therefore always some shade of brown. It hardens upon exposure but it does not weather well and is not considered a good building stone.