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Chert (/tʃɜːrt/) is a hard, fine-grained
sedimentary rock
composed of
microcrystalline or
cryptocrystalline quartz, the
mineral form of
silicon dioxide...
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grained to
medium grained limestone and
dolomite with
cherty inclusions. To
almost pure chert. The
cherty facies are the
Clear Cr**** and Gr****y **** formations...
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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...
- 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...
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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...
- Wyoming, and Montana. It is
defined by its
cherty, gray to
pinkish limestone,
calcareous siltstone, and
cherty sandstone. The
rocks in this
formation formed...
- System.
Several of the
limestone formations in the
Kansas City
Group are
cherty.
Invertebrate marine fossil in
Cement City Limestone,
Dewey Formation, Upper...
- pre-Cambrian up to
present day.
During Phanerozoic, terrigenous,
volcanogenic and
cherty-carbonate
sediments containing in
abundance graptolites, bivalves, brachiopods...
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fragments found in
rocks of the
middle Berriasian (Early Cretaceous) age in the
Cherty Freshwater Member of the
Lulworth Formation in
England and also the Angeac-Charente...
