-
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...
- from
ooids,
spherical grains composed of
concentric layers. Strictly,
oolites consist of
ooids of
diameter 0.25–2 millimetres;
rocks composed of
ooids larger...
-
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...
- are
concretionary grains –
typically of
calcium carbonate which resemble ooids, but are more than 2 mm in diameter.
These grains are
approximately spherical...
-
sedimentary rock
containing kerogen Oolite –
Sedimentary rock
formed from
ooids Phosphorite –
Sedimentary rock
containing large amounts of
phosphate minerals...
- to air or water, and its
ooids do not have a
calcite mosaic around the nucleus. Uranium-thorium
dating indicates that the
ooids in the Fort
Dallas and Key...
-
Carbonate ooids on the
surface of a limestone;
Carmel Formation (Middle Jur****ic) of
southern Utah, USA.
Largest is 1.0 mm in diameter....
-
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...
- A
photomicrograph of a thin
section of a
limestone with
ooids. The
largest is
approximately 1.2 mm in diameter. The red
object in the
lower left is a...
-
describe the
recognisable "grains" in
carbonate rocks.
Examples would include ooids, peloids, oncolites, pellets,
fossil or pre-existing
carbonate fragments...
