Examples of argillaceous

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The middle part of the member consists of pinkish, brownish or mostly purplish sandstones, which are less siliceous and generally possess an argillaceous matrix.
The principal components of the coquinas comprise dispersed elements from within the argillaceous 'background' facies.
The lower part of the member includes brownish to reddish argillaceous and partly quartz-arenitic interbeds.
The top unit is underlain by roughly 20 m of fine-grained, rarely coarser sandstones which are argillaceous and abundantly micaceous.
The lower 88 m are made up of the typical mauve argillaceous micaceous, fine-grained sandstones with rare brownish shaly interbeds.
The top 14 m consist of purple, argillaceous medium-grained sandstones, some of which are slightly quartz-arenitic, and with rare intercalations of brownish-red mudstones and siltstones.
Individual beds are usually 3-5 cm thick with concentrations of argillaceous material on uneven bedding surfaces.
The 3 m are fine- to middle-grained purplish sandstone, very argillaceous, with low mica content and brownish shale clasts.
There are occasional argillaceous partings rich in finely divided plant fragments.
The sandstones are quite homogeneous with abundant small mica flakes, but more argillaceous portions show a distinct fine banding.
Conversely, there are parts of the coalfield where thrusts are relatively rare in the earlier argillaceous sequence.
It can be deduced that sediment reworking is taking place as shown by the discrete scour and rip-up clasts of argillaceous sandstone in a matrix of identical lithology.
Given their origin as allochthonous storm concentrations, the principal constituents of the coquinas are to be found as dispersed, parautochthonous components within the intervening argillaceous background sediments.
These comprise shallowing-upward successions, including several metres of transitional facies, that is, reflecting the successive progradation of carbonate platforms across argillaceous limestone deposited in deeper waters.
Garnet higher in pyrope contents suggests derivation from garnet-bearing metabasites, while those with lesser pyrope contents are supposed to have been derived from garnet-bearing gneisses of argillaceous origin.

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