nodular chert

nodular chert

[′näj·ə·lər ′chərt]
(geology)
Chert occurring as nodular or concretionary segregations (chert nodules).
References in periodicals archive ?
According to Maliva & Siever (1989), outlines of "carbonate precursors" in chert bodies clearly document that most nodular chert is a replacement of carbonate strata or sediments.
Several models have been proposed for the origin of nodular chert.
Nodular chert from the Arbuckle Group, Slick Hills, SW Oklahoma: a combined field, petrographic, and isotopic study.