Thesaurus Term/Concept: SEPTARIA
| Identifier | 98180 |
|---|---|
| Class | MAIN BUILDING MATERIALS |
| Status | Preferred |
| Index? | Yes |
| Scope Note | Conglomerate consisting of nodules of calcium rich clay (marl). Used as a building stone from Roman times and as a key ingredient in Parker's Roman Cement, between 1796 and circa 1850. |