Secondary rocks

(Geol.) those lying between the Primary, or Paleozoic, and Tertiary (see Primary rocks, under Primary); - later restricted to strata of the Mesozoic age, and at present but little used.

See also: Secondary

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He covers techniques involving minerals, lithics, sand, secondary rocks, ores, sediments and soils, clay, organic and biological substances, carbohydrates, lipids, proteins, nucleic acids, fibers, dyes, bioinorganic materials, human and animal remains, effects of the environment on the decay of archaeological materials and authentication of antiques.
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