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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..
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Supradecompound
::
Supracretaceous
(a.) Lying above the
chalk;
Supercretaceous.
Colorado Group
::
Colorado
group () A
subdivision
of the
cretaceous
formation
of
western
North
America,
especially
developed
in
Colorado
and the upper
Missouri
region..
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..
Cretaceously
::
Cretaceously
(adv.)
In a
chalky
manner;
as
chalk.
Scaphite
::
Scaphite
(n.) Any
fossil
cephalopod
shell of the genus
Scaphites,
belonging
to the
Ammonite
family
and
having
a
chambered
boat-shaped
shell.
Scaphites
are found in the
Cretaceous
formation..
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..
Cretose
::
Cretose
(a.)
Chalky;
cretaceous.
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..
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..
Rudistes
::
Rudistes
(n. pl.) An
extinct
order or
suborder
of
bivalve
mollusks
characteristic
of the
Cretaceous
period;
--
called
also
Rudista.
See
Illust.
under
Hippurite.
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..
Laramie Group
::
Laramie
group () An
extensive
series
of
strata,
principally
developed
in the Rocky
Mountain
region,
as in the
Laramie
Mountains,
and
formerly
supposed
to be of the
Tertiary
age, but now
generally
regarded
as
Cretaceous,
or of
intermediate
and
transitional
character.
It
contains
beds of
lignite,
often
valuable
for coal, and is hence also
called
the
lignitic
group.
See Chart of
Geology..
Mosasauria
::
Mosasauria
(n. pl.) An order of
large,
extinct,
marine
reptiles,
found in the
Cretaceous
rocks,
especially
in
America.
They were
serpentlike
in form and in
having
loosely
articulated
and
dilatable
jaws, with large
recurved
tteth,
but they had
paddlelike
feet. Some of them were over fifty feet long. They are,
essentially,
fossil
sea
serpents
with
paddles.
Called
also
Pythonomarpha,
and
Mosasauria..
Inoceramus
::
Inoceramus
(n.) An
extinct
genus of
large,
fossil,
bivalve
shells,allied
to the
mussels.
The genus is
characteristic
of the
Cretaceous
period..
Galerite
::
Galerite
(n.) A
cretaceous
fossil
sea
urchin
of the genus
Galerites.
Mosasaurus
::
Mosasaurus
(n.) A genus of
extinct
marine
reptiles
allied
to the
lizards,
but
having
the body much
elongated,
and the limbs in the form of
paddles.
The first known
species,
nearly
fifty feet in
length,
was
discovered
in
Cretaceous
beds near
Maestricht,
in the
Netherlands..
Cretaceous
::
Cretaceous
(a.)
Having
the
qualities
of
chalk;
abounding
with
chalk;
chalky;
as,
cretaceous
rocks and
formations.
See
Chalk..
Lituite
::
Lituite
(n.) Any
species
of
ammonites
of the genus
Lituites.
They are found in the
Cretaceous
formation.
Elasmosaurus
::
Elasmosaurus
(n.) An
extinct,
long-necked,
marine,
cretaceous
reptile
from
Kansas,
allied
to
Plesiosaurus..
Hadrosaurus
::
Hadrosaurus
(n.) An
American
herbivorous
dinosaur
of great size,
allied
to the
iguanodon.
It is found in the
Cretaceous
formation..
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