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Bentonite (/ˈbɛntənaɪt/ BEN-tə-nyte) is an
absorbent swelling clay
consisting mostly of
montmorillonite (a type of smectite)
which can
either be Na-montmorillonite...
- a clay matrix. It is
interbedded with variegated, pale-green to red,
bentonitic mudstone lenses. However,
recent detrital zircon geochronology results...
-
ammonites died, they sank to the
bottom and were
buried by
layers of
bentonitic mud that
eventually became shale. Many gem-quality
ammonites are found...
- sandstones,
calcareous sandstones, siltstones,
sandy shales and mudstones,
bentonitic sandstones and shales,
bentonite beds,
ironstone concretions, carbonaceous...
-
limiting the
number of
exposed outcrops. Paleosols,
fluvial deposits and
bentonitic layers are
common in the Two
Medicine Formation. The Two
Medicine Formation...
- lies in the
middle and is
composed of pale-purple, gray to
almost white,
bentonitic mudstone. The
uppermost unit is the
Himes Member,
which contains some...
-
brown to gray mudstone,
andesitic sandstone, conglomerate, and
minor bentonitic and
pumiceous tuff. In the
northern San
Ramon area, the T****ajara Formation...
- and are
generally low in
organic matter. The
extensive bentonite and
bentonitic mudstone found in the Swan
Hills is
composed of the clay
mineral montmorillonite...
- been
famous later in
medieval times. All the
above seem to have been
bentonitic clays. The
earth which did not
stain the
hands was
known as rubrica. In...
- de Araújo,
Laury (2006), "Shrimp U–Pb
zircon dating and
palynology of
bentonitic layers from the
Permian Irati Formation, Paraná Basin, Brazil", Gondwana...
