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Definition of silurian
Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of silurian is as below...
Silurian
(a.) Of or
pertaining
to the
country
of the
ancient
Silures;
-- a term
applied
to the
earliest
of the
Paleozoic
eras, and also to the
strata
of the era,
because
most
plainly
developed
in that
country..
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Asaphus
::
Asaphus
(n.) A genus of
trilobites
found in the Lower
Silurian
formation.
See
Illust.
in
Append.
Trinucleus
::
Trinucleus
(n.) A genus of Lower
Silurian
trilobites
in which the
glabella
and
cheeks
form three
rounded
elevations
on the head.
Tilestone
::
Tilestone
(n.) A kind of
laminated
shale or
sandstone
belonging
to some of the
layers
of the Upper
Silurian.
Taconic
::
Taconic
(a.)
Designating,
or
pertaining
to, the
series
of rocks
forming
the
Taconic
mountains
in
Western
New
England.
They were once
supposed
to be older than the
Cambrian,
but later
proved
to
belong
to the Lower
Silurian
and
Cambrian..
Medina Epoch
::
Medina
epoch () A
subdivision
of the
Niagara
period
in the
American
upper
Silurian,
characterized
by the
formations
known as the
Oneida
conglomerate,
and the
Medina
sandstone.
See the Chart of
Geology..
Ordovician
::
Ordovician
(a.) Of or
pertaining
to a
division
of the
Silurian
formation,
corresponding
in
general
to the Lower
Silurian
of most
authors,
exclusive
of the
Cambrian..
Trilobite
::
Trilobite
(n.) Any one of
numerous
species
of
extinct
arthropods
belonging
to the order
Trilobita.
Trilobites
were very
common
in the
Silurian
and
Devonian
periods,
but
became
extinct
at the close of the
Paleozoic.
So named from the three lobes
usually
seen on each
segment..
Cliff Limestone
::
Cliff
limestone
() A
series
of
limestone
strata
found in Ohio and
farther
west,
presenting
bluffs
along the
rivers
and
valleys,
formerly
supposed
to be of one
formation,
but now known to be
partly
Silurian
and
partly
Devonian..
Graptolite
::
Graptolite
(n.) One of
numerous
species
of
slender
and
delicate
fossils,
of the genus
Graptolites
and
allied
genera,
found in the
Silurian
rocks.
They
belong
to an
extinct
group
(Graptolithina)
supposed
to be
hydroids..
Silurian
::
Silurian
(n.) The
Silurian
age.
Halysites
::
Halysites
(n.) A genus of
Silurian
fossil
corals;
the chain
corals.
See Chain
coral,
under
Chain..
Wenlock Group
::
Wenlock
group () The
middle
subdivision
of the Upper
Silurian
in Great
Britain;
-- so named from the
typical
locality
in
Shropshire.
Cambrian
::
Cambrian
(a.) Of or
pertaining
to the
lowest
subdivision
of the rocks of the
Silurian
or
Molluscan
age; --
sometimes
described
as
inferior
to the
Silurian.
It is named from its
development
in
Cambria
or
Wales.
See the
Diagram
under
Geology.
Primordial
::
Primordial
(a.) Of or
pertaining
to the
lowest
beds of the
Silurian
age,
corresponding
to the
Acadian
and
Potsdam
periods
in
American
geology.
It is
called
also
Cambrian,
and by many
geologists
is
separated
from the
Silurian..
Favosites
::
Favosites
(n.) A genus of
fossil
corals
abundant
in the
Silurian
and
Devonian
rocks,
having
polygonal
cells with
perforated
walls..
Chazy Epoch
::
Chazy epoch () An epoch at the close of the
Canadian
period
of the
American
Lower
Silurian
system;
-- so named from a
township
in
Clinton
Co., New York. See the
Diagram
under
Geology..
Trenton Period
::
Trenton
period
() A
subdivision
in the lower
Silurian
system
of
America;
-- so named from
Trenton
Falls,
in New York. The rocks are
mostly
limestones,
and the
period
is
divided
into the
Trenton,
Utica,
and
Cincinnati
epochs.
See the Chart of
Geology..
Quebec Group
::
Quebec
group () The
middle
of the three
groups
into which the rocks of the
Canadian
period
have been
divided
in the
American
Lower
Silurian
system.
See the Chart of
Geology.
Maclurea
::
Maclurea
(n.) A genus of
spiral
gastropod
shells,
often of large size,
characteristic
of the lower
Silurian
rocks..
Silurian
::
Silurian
(a.) Of or
pertaining
to the
country
of the
ancient
Silures;
-- a term
applied
to the
earliest
of the
Paleozoic
eras, and also to the
strata
of the era,
because
most
plainly
developed
in that
country..
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