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Definition of cretaceous
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 cretaceous is as below...
Cretaceous
(a.)
Having
the
qualities
of
chalk;
abounding
with
chalk;
chalky;
as,
cretaceous
rocks and
formations.
See
Chalk..
Lern More About Cretaceous
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Inoceramus
::
Inoceramus
(n.) An
extinct
genus of
large,
fossil,
bivalve
shells,allied
to the
mussels.
The genus is
characteristic
of the
Cretaceous
period..
Cretaceous
::
Cretaceous
(a.)
Having
the
qualities
of
chalk;
abounding
with
chalk;
chalky;
as,
cretaceous
rocks and
formations.
See
Chalk..
Parkeria
::
Parkeria
(n.) A genus of large
arenaceous
fossil
Foraminifera
found in the
Cretaceous
rocks.
The
species
are
globular,
or
nearly
so, and are of all sizes up to that of a
tennis
ball..
Ichthyornis
::
Ichthyornis
(n.) An
extinct
genus of
toothed
birds found in the
American
Cretaceous
formation.
It is
remarkable
for
having
biconcave
vertebrae,
and
sharp,
conical
teeth set in
sockets.
Its wings were well
developed.
It is the type of the order
Odontotormae..
Ichthyosauria
::
Ichthyosauria
(n. pl.) An
extinct
order of
marine
reptiles,
including
Ichthyosaurus
and
allied
forms;
--
called
also
Ichthyopterygia.
They have not been found later than the
Cretaceous
period..
Rudistes
::
Rudistes
(n. pl.) An
extinct
order or
suborder
of
bivalve
mollusks
characteristic
of the
Cretaceous
period;
--
called
also
Rudista.
See
Illust.
under
Hippurite.
Turonian
::
Turonian
(n.) One of the
subdivisions
into which the Upper
Cretaceous
formation
of
Europe
is
divided.
Colorado Group
::
Colorado
group () A
subdivision
of the
cretaceous
formation
of
western
North
America,
especially
developed
in
Colorado
and the upper
Missouri
region..
Supercurious
::
Supercretaceous
(a.) Same as
Supracretaceous.
Ichthyosaurus
::
Ichthyosaurus
(n.) An
extinct
genus of
marine
reptiles;
-- so named from their
short,
biconcave
vertebrae,
resembling
those of
fishes.
Several
species,
varying
in
length
from ten to
thirty
feet, are known from the
Liassic,
Oolitic,
and
Cretaceous
formations..
Belemnite
::
Belemnite
(n.) A
conical
calcareous
fossil,
tapering
to a point at the lower
extremity,
with a
conical
cavity
at the other end, where it is
ordinarily
broken;
but when
perfect
it
contains
a small
chambered
cone,
called
the
phragmocone,
prolonged,
on one side, into a
delicate
concave
blade;
the
thunderstone.
It is the
internal
shell of a
cephalopod
related
to the
sepia,
and
belonging
to an
extinct
family.
The
belemnites
are found in rocks of the
Jurassic
and
Cretaceous
ages..
Enchodus
::
Enchodus
(n.) A genus of
extinct
Cretaceous
fishes;
-- so named from their
spear-shaped
teeth.
They were
allied
to the pike
(Esox).
Laelaps
::
Laelaps
(n.) A genus of huge,
carnivorous,
dinosaurian
reptiles
from the
Cretaceous
formation
of the
United
States.
They had very large hind legs and tail, and are
supposed
to have been
bipedal.
Some of the
species
were about
eighteen
feet
high..
Baculite
::
Baculite
(n.) A
cephalopod
of the
extinct
genus
Baculites,
found
fossil
in the
Cretaceous
rocks.
It is like an
uncoiled
ammonite..
Senonian
::
Senonian
(a.) In
european
geology,
a name given to the
middle
division
of the Upper
Cretaceous
formation..
Cretose
::
Cretose
(a.)
Chalky;
cretaceous.
Wealden
::
Wealden
(a.) Of or
pertaining
to the
lowest
division
of the
Cretaceous
formation
in
England
and on the
Continent,
which
overlies
the
Oolitic
series..
Hippurite
::
Hippurite
(n.) A
fossil
bivalve
mollusk
of the genus
Hippurites,
of many
species,
having
a
conical,
cup-shaped
under
valve,
with a
flattish
upper valve or lid.
Hippurites
are found only in the
Cretaceous
rocks..
Neocomian
::
Neocomian
(n.) A term
applied
to the
lowest
deposits
of the
Cretaceous
or chalk
formation
of
Europe,
being the lower
greensand..
Gault
::
Gault (n.) A
series
of beds of clay and marl in the South of
England,
between
the upper and lower
greensand
of the
Cretaceous
period..
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