coral-rag Geol.
[f. coral + rag in its local sense of hard coarse-textured rock.]
The upper member of the Middle Oolite series, a kind of limestone, containing continuous beds of petrified corals.
| 1816 W. Smith Strata Ident. 19 The Coral Rag consists chiefly of lumps of coralline Limestone. 1878 Huxley Physiogr. xvii. 274 The coral-rag itself is altogether similar to the coral-limestone. |