autochthonous sediment

autochthonous sediment

[ȯ′täk·thə·nas ′sed·ə·mənt]
(geology)
A residual soil deposit formed in place through decomposition.
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It overlies the autochthonous sediments of non-marine to marine transgressive sediments and unconformably overlain by the Waitemata and correlative groups of Upper Oligocene-Lower Miocene age.