-
ooid cortex. Both in
tangential and in
radial ooids, the
cortex is
composed of many very fine
increments of growth. Some
modern (and ancient)
ooids partially...
-
irregular in shape.
Limestone composed mostly of
ooids is
called an
oolite or
sometimes an
oolitic limestone.
Ooids form in high-energy environments, such as...
- from
ooids,
spherical grains composed of
concentric layers. Strictly,
oolites consist of
ooids of
diameter 0.25–2 millimetres;
rocks composed of
ooids larger...
- are
concretionary grains –
typically of
calcium carbonate which resemble ooids, but are more than 2 mm in diameter.
These grains are
approximately spherical...
-
turbulence that
causes ooids to form such
concentric shapes is
indicative of
intensity of the current. The more
circular the
ooids, the
higher the turbulence...
-
Carbonate ooids on the
surface of a limestone;
Carmel Formation (Middle Jur****ic) of
southern Utah, USA.
Largest is 1.0 mm in diameter....
- "Giant"
ooids of the
Johnnie Formation in the
Death Valley area, California, USA.
Ooids are near-spheroidal
calcium carbonate grains that ac****ulate around...
-
temperature about 3 °C (5.4 °F) and the
salinity by 0.5 per cent.
Cemented ooids are
referred to as grapestone. Additionally,
giant stromatolites are found...
-
sedimentary rock
containing kerogen Oolite –
Sedimentary rock
formed from
ooids Phosphorite –
Sedimentary rock
containing large amounts of
phosphate minerals...
-
Petrographic evidence for
these calcite sea
conditions consists of
calcitic ooids, lmc cements, hardgrounds, and
rapid early seafloor aragonite dissolution...
