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A mature sediment is more uniform in appearance, for the sediment grains are well rounded, are of a similar size and exhibit little compositional variation. Conversely, an immature sediment contains more angular grains, diverse grain sizes, and is compositionally diverse.
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A sediment sample from the lower (downstream) portions of a stream is likely to be more mature than one found upstream, since the original sediment has been subject to more abrasion as it travels downstream.
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describes how rounded and sorted the sample is while composition describes how much the composition trends toward stable
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Basu, A. (1985). Reading provenance from detrital quartz. In
Provenance of arenites (pp. 231-247). Springer, Dordrecht.
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As the sediment is transported, the unstable minerals are abraded or dissolved to leave more stable minerals, such as
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or abrasion of the grains during transport. There are two components to describe maturity,
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which is a measure of the common resistant minerals found in ultra-weathered sediments:
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