Compacted

Shale rock is a sedimentary rock made up of clay, compacted together by pressure.

I have a small piece of garden that has quite compacted soil.

The walls were made of compacted dirt.

The dung ball is compacted.

The dung beetle was rolling a compacted dung beetle.

You need to excavate and remove the topsoil, line the subsoil with a geotextile, then lay and compact hardcore. Follow this with a layer of compacted "hoggin" – compacted clay, gravel and sand. This is then sprayed with hot bitumen, and has a layer of pea shingle rolled into it.