- resembling or containing clay; "argillaceous rocks"
- Argillaceous minerals appear silvery upon optical reflection and are minerals containing substantial amounts of clay-like components (ἄργιλλος = clay). ...
- clayey -- i.e., containing abundant clay.
- sandstones, such as greywacke, which have a significant clay or silt content.
- soils which are predominantly clay or abounding in clays or claylike materials.
- Describing rocks or sediments containing particles that are silt- or clay-sized, less than 0.625 mm in size. Most have a high clay-mineral content.
- Containing a certain amount of clayey matter, such as shale.
- containing or composed largely of clay (e.g. argillaceous shale, etc.)
- A general term for marl, sedimentary clay, shale or siltstones. Argilo-calcaire is a combination of limestone and clay.
- Consisting of clays or having a clayey nature
- Formations, beds, and strata that contain significant proportions of clay minerals such as found in shales, silts, and slate.
- Composed mostly of clay.