- tuff,
while rock
containing 25% to 75% ash is
described as
tuffaceous (for example,
tuffaceous sandstone). A
pyroclastic rock
containing 25–75% volcanic...
- concludes: "The Duke
quarry phyllite was
derived from argillite, tuff or
tuffaceous sandstone, and
volcanic breccia.
Occurrence of
laminated argillites suggests...
-
Tuffaceous sandstone layers in New Mexico...
- late
Permian around 255.02 Ma. This
formation includes tuff,
tuffaceous sandstone,
tuffaceous siltstone, claystone, and chert.
Often noticed at
Nobbys Head...
- the
subsoil and
underneath is
tuffaceous material of
varying degrees of
disintegration and weathering. This
tuffaceous material is
exposed by extensive...
- the
ocean it
forms a
littoral cone, a
small cone-shaped ac****ulation of
tuffaceous debris formed when the
blocky ʻaʻā lava
enters the
water and explodes...
- The
rhyolitic rocks consist of lava
flows and
hydrothermally altered tuffaceous rocks that are part of two
distinct eruptive centers,
which are interpreted...
- Late
Miocene up to the
Early Pliocene,
roughly from 9.6 to 4.5 Ma. The
tuffaceous sandstones,
diatomaceous siltstones,
conglomerates and
dolomites were...
-
interbedded with
tuffaceous mudstones and sandstones, and some pumice. The
unnamed lower member is a hard
platy shale alternating with beds of
tuffaceous mudstones...
-
yellowish and
greenish sandstones of fine-to-medium grain, some of
which are
tuffaceous.
These deposits were laid down
during the
Upper Cretaceous,
either in...
