Umbrisols develop in weathering material of siliceous rock.
2.
It consists of sandy alluvium more or less coloured with pebbles consisting mainly of siliceous rocks.
3.
It is common and characteristic of siliceous rock in interior valley and western mountains of California.
4.
Quartz or mica and an admixture of carbonates, siliceous rock fragments or organic remains may be common.
5.
It grows on exposed or partially shaded siliceous rock, with a few known occurrences on serpentine rock.
6.
Beads tend to be carefully made out of hard siliceous rock such as quartz, chalcedony, jasper, or carnelian.
7.
Its lower Miocene members show indications of weak coastal upwelling, with fossil assemblages and calcareous-siliceous rocks formed from diatoms and coccolithophorids.
8.
A set of very fine petro-siliceous rocks, which are almost black, but have a perceptible purplish tinge are situated on the western shore.
9.
It grows in Eurasia, and North America on siliceous rock, schist or igneous rock in habitats exposed to sunlight, also rarely on calciferous rock.
10.
Its middle and upper Miocene upwelling-rich assemblages, and its unique highly siliceous rocks from diatom-rich plankton, became diatomites, porcelainites, and banded cherts.
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