chert
Noun
Meaning
An impure, massive, flintlike quartz or hornstone, of a dull color.
Source: Webster's dictionarySynonyms
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Flint (a type of chert unique to chalk) is very common as bands parallel to the bedding or as nodules embedded in chalk.
Grains can include quartz or chert rock fragments.
It includes large flint and chert bifacials that may be of Heavy Neolithic origin.
The oxygen then combined with dissolved iron in Earth's oceans to form insoluble iron oxides, which precipitated out, forming a thin layer on the ocean floor, which may have been anoxic mud (forming shale and chert).