-
Chert (/tʃɜːrt/) is a hard, fine-grained
sedimentary rock
composed of
microcrystalline or
cryptocrystalline quartz, the
mineral form of
silicon dioxide...
- Pre-Christian
Slavic writing is a
hypothesized writing system that may have been used by the
Slavs prior to
Christianization and the
introduction of the...
-
overlain by 500 to 600 feet (150 to 180 m) of dolomite,
often sandy,
silty or
cherty,
forming the
Elvins Group and the
Potosi and
Eminence formations. Withdrawal...
- is
customarily restricted to hard, co****ly banded, non-banded, and non-
cherty sedimentary rocks of post-Precambrian age. The
Precambrian deposits, which...
-
composed of carbonates,
chiefly dolomite, with some limestone.
There are also
cherty inclusions as well as thin beds of sandstone. The Knox lies
beneath a unconformity...
- tuffs,
cherts and siltstones)
which are dense, fine-grained and
flinty /
cherty in
texture and
found in a
number of localities. The "Lydian Stone" known...
-
ancient numbers Abacus Australian Aboriginal enumeration Carpenters'
marks Cherty i rezy
Chuvash numerals Counting rods
Finger counting Hangman (game) History...
-
breccia consists of
fragments of
white to dark gray
cherty material, quartz-rich sandstone,
diagenetic cherty nodules, and
stromatolitic limestone and is intensively...
- states. The
nearly level to
rolling Springfield Plateau is
underlain by
cherty limestone of the
Mississippian Boone Formation and
Burlington Limestone;...
- the
range of
granite hills formed by the
Giants Range batholith.
These cherty iron ore
deposits are
Precambrian in the
Vermilion Range and
middle Precambrian...
