Examples of siliceous

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However, few recognizable trends are apparent within the data clusters for the siliceous gneisses.
These sediments are locally interbedded with siliceous limestone and rare thin-bedded sandstones.
Overall, sedimentation was mainly controlled by an interplay of post-rift thermal subsidence, plume-related uplift, siliceous oceanic productivity, climatic change and eustatic sea-level change.
The section then continues for a distance of approximately 300 m along the eastern side of the road, with ribbon radiolarites interbedded with siliceous mudstones.
These c. 60 m consist mainly of green fine-grained micaceous and siliceous sandstones with frequent thin shale seams.
The age dating is based on calcareous and siliceous microfossils.
Two beds of siliceous breccia are present about 12.7 m from the base and at the top of the unit.
The basalt-chert-pelagic limestone association (3) comprises oceanic basalts of supra-subduction zone-type chemical affinities, associated with siliceous (radiolarian) and calcareous pelagic sediments.
Thin-bedded (5-10 cm), white, siliceous pelagic limestone, intercalated with radiolarian chert, exhibits planar lamination and very small-scale cross lamination.
Siliceous ash flow tuffs dominate the eruptive products.
Higher nutrient supply to surface waters would have favoured organic and siliceous plankton production and reduced rates of calcareous plankton rain.
The rift basin was then covered by siliceous pelagic carbonate, in which chert formed diagenetically.
The middle part of the member consists of pinkish, brownish or mostly purplish sandstones, which are less siliceous and generally possess an argillaceous matrix.
Near the base, red-brown, well-bedded radiolarian cherts and siliceous mudstones are depositionally interbedded with three intercalations of basaltic rudite and subordinate volcaniclastic sandstone.
Finely crystalline diagenetic chert and coarser siliceous cement has replaced much of the primary carbonate.

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