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Graptolites are a
group of
colonial animals,
members of the
subclass Graptolithina within the
class Pterobranchia.
These filter-feeding
organisms are known...
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Graptolitic argillite (also
known as
dictyonema argillite,
dictyonema oil shale,
dictyonema shale, or
Tremadocian black shale) is a marinite-type black...
- are
sedimentary rocks laid down
during the
Ordovician geologic period.
Graptolitic argillite is the
larger oil
shale resource, but,
because its organic...
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lying in a north-east–south-west direction. The
Ordovician rocks are
graptolitic black shales and
grits of
Llandeilo and
Caradoc age. They
occupy all...
- was
rebuilt by
Soviets to
extract uranium oxide from the
locally mined graptolitic argillite ore (a type of oil shale).
During that time, many war prisoners...
- Grey
chunks of
graptolitic argillite on
Pakri Peninsula, Estonia;
yellowish and
white chunks are limestone...
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Russia Jur****ic 19,580 2,800 Wadi
Maghar Jordan Cretaceous 14,009 2,149
Graptolitic argillite Estonia Ordovician 12,386 1,900
Timahdit Morocco Cretaceous...
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Limestone cement north 9,400,000 mln m3 Clay
cement north 15,6000,000 mln m3
Graptolitic argillite north 64,000,000,000 mln t Wood
across the
country 15,6000...
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originally named by
Raymond Thorsteinsson for a
sequence of calcareous,
graptolitic mudrocks on
northern Devon Island situated between the
Douro Formation...
- (141 ft)
thick Birkhill Shale,
which consist predominantly of
black graptolitic shale with
subordinate gray
mudstones and meta-bentonites. The base was...
