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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
(n.) The
Silurian
age.
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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..
Silurian
::
Silurian
(n.) The
Silurian
age.
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..
Tilestone
::
Tilestone
(n.) A kind of
laminated
shale or
sandstone
belonging
to some of the
layers
of the Upper
Silurian.
Delthyris
::
Delthyris
(n.) A name
formerly
given to
certain
Silurian
brachiopod
shells
of the genus
Spirifer.
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..
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..
Niagara Period
::
Niagara
period
() A
subdivision
or the
American
Upper
Silurian
system,
embracing
the
Medina,
Clinton,
and
Niagara
epoch.
The rocks of the
Niagara
epoch,
mostly
limestones,
are
extensively
distributed,
and at
Niagara
Falls
consist
of about
eighty
feet of shale
supporting
a
greater
thickness
of
limestone,
which is
gradually
undermined
by the
removal
of the
shale.
See Chart of
Geology..
Paleozoic
::
Paleozoic
(a.) Of or
pertaining
to, or
designating,
the older
division
of
geological
time
during
which life is known to have
existed,
including
the
Silurian,
Devonian,
and
Carboniferous
ages, and also to the life or rocks of those ages. See Chart of
Geology..
Phacops
::
Phacops
(n.) A genus of
trilobites
found in the
Silurian
and
Devonian
formations.
Phacops
bufo is one of the most
common
species.
Wenlock Group
::
Wenlock
group () The
middle
subdivision
of the Upper
Silurian
in Great
Britain;
-- so named from the
typical
locality
in
Shropshire.
Eophyte
::
Eophyte
(n.) A
fossil
plant which is found in the
lowest
beds of the
Silurian
age.
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..
Eurypterus
::
Eurypterus
(n.) A genus of
extinct
Merostomata,
found in
Silurian
rocks.
Some of the
species
are more than three feet
long..
Trinucleus
::
Trinucleus
(n.) A genus of Lower
Silurian
trilobites
in which the
glabella
and
cheeks
form three
rounded
elevations
on the head.
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..
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..
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..
Salina Period
::
Salina
period
() The
period
in which the
American
Upper
Silurian
system,
containing
the
brine-producing
rocks of
central
New York, was
formed.
See the Chart of
Geology..
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.
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