Examples of chert

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Depleted olivine basalts are associated with radiolarian cherts while most pelagic limestones and cherts are found interbedded with alkali basalts.
The chert colour changes from whitish to black above the basal covered tract.
Individual radiolarian chert beds range in thickness from 3-4 cm thick and are interbedded with shale or mudstone.
However, a small number of chert nodules are concretionary.
Limestone fragments and a few silicified grains (chert) are present, within a calcite spar cement.
These conglomerates are composed of clasts of basalt, volcaniclastic sandstone, alkaline lava and sub-rounded chert.
The abundance of conodont elements also shows significant variation in similar chert lithologies, probably indicating fluctuations in sedimentation rate at particular stratigraphical intervals.
Tuffitic layers alternate with metapelites, arkoses and cherts.
The main lithology of the metamor phic sole is amphibolite, with subordinate greenschist, marble and meta-chert.
Fragments of shale and chert are indicative of parent material of lower regional metamorphism than the gneissic fragments.
It is interesting to note that 11 of 36 chert bifacial points recovered from the structure were found in this room.
The rift basin was then covered by siliceous pelagic carbonate, in which chert formed diagenetically.
These sediments were extensively silicified during diagenesis and preserved as chert of replacement origin.

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