- by the
lithologic term marekanite, this
variety of
obsidian occurs as
subrounded to
subangular bodies up to
about 2 in (51 mm) in diameter,
often bearing...
- fragments; most
feldspar is K-feldspar with only
minor plagioclase as
subrounded grains and
highly altered inclusions within K-feldspar. The
grains are...
-
cliffs and part of the
intertidal zone. The
gravel consists of
angular to
subrounded (kidney-shaped)
limestone clasts and
large erratics of red
granites and...
- gravel. If the
gravel clasts that
comprise it are
largely well-rounded to
subrounded, it is a conglomerate. If the
gravel clasts that
comprise it are largely...
-
descriptive terms range from very
angular to
angular to
subangular to
subrounded to
rounded to very rounded, with
increasing degree of roundness. Surface...
-
entire or
occasionally repand, with
acute apices and
broadly cuneate to
subrounded bases.
Upper leaf
surfaces are
shiny green to yellowish-green,
while the...
-
consisted originally of
gravelly sands and
sandy gravels composed of
subrounded pebbles of red jasper,
white quartzite, semi-transparent quartz, and black...
-
typically casts or
molds of
adjoining units.
Vertices are
angular or
subrounded; the tops of the
prisms are
somewhat indistinct and
normally flat. Columnar...
-
Lorrain Formation of the
Cobalt Group. The
jasper conglomerate consists of
subrounded pebbles of red jasper,
black chert,
white quartzite, hematite, and semi-transparent...
-
lithic fragments in
volcanic ash are
typically equant, or
angular to
subrounded.
Lithic morphology in ash is
generally controlled by the
mechanical properties...
