| slovo | definícia |
cretaceous
(encz) | cretaceous,křídový adj: Zdeněk Brož |
cretaceous
(encz) | cretaceous,vápenitý adj: Zdeněk Brož |
cretaceous
(encz) | Cretaceous,křída n: [geol.] nejmladší a zároveň nejdelší útvar
druhohor Pino |
Cretaceous
(gcide) | Cretaceous \Cre*ta"ceous\ (kr[-e]*t[=a]"sh[u^]s), a. [L.
cretaceus, fr. creta chalk. See Crayon.]
1. Having the qualities of chalk; abounding with chalk;
chalky; as, cretaceous rocks and formations. See Chalk.
[1913 Webster]
2. (Geol.) Of, pertaining to, or designating, the period of
time following the Jurassic and preceding the Tertiary,
generally given as from 144 million years b. p. to 65
million years b. p.. Also called |
cretaceous
(wn) | cretaceous
adj 1: abounding in chalk
2: of or relating to or denoting the third period of the
Mesozoic era
n 1: from 135 million to 63 million years ago; end of the age of
reptiles; appearance of modern insects and flowering plants
[syn: Cretaceous, Cretaceous period] |
| | podobné slovo | definícia |
cretaceously
(encz) | Cretaceously, |
Cretaceous
(gcide) | Cretaceous \Cre*ta"ceous\ (kr[-e]*t[=a]"sh[u^]s), a. [L.
cretaceus, fr. creta chalk. See Crayon.]
1. Having the qualities of chalk; abounding with chalk;
chalky; as, cretaceous rocks and formations. See Chalk.
[1913 Webster]
2. (Geol.) Of, pertaining to, or designating, the period of
time following the Jurassic and preceding the Tertiary,
generally given as from 144 million years b. p. to 65
million years b. p.. Also called |
Cretaceous acid
(gcide) | Cretacic \Cre*tac"ic\
[Webster 1913 Suppl. +PJC]
Cretaceous acid,
an old name for carbonic acid.
Cretaceous formation (Geol.), the series of strata of
various kinds, including beds of chalk, green sand, etc.,
formed in the Cretaceous period; -- called also the {chalk
formation}. See the Diagram under Geology.
Cretaceous period (Geol.), the time in the latter part of
the Mesozoic age during which the Cretaceous formation was
deposited, and at the end of which the dinosaurs died out.
See Cretaceous.
[1913 Webster +PJC] |
Cretaceous formation
(gcide) | Cretacic \Cre*tac"ic\
[Webster 1913 Suppl. +PJC]
Cretaceous acid,
an old name for carbonic acid.
Cretaceous formation (Geol.), the series of strata of
various kinds, including beds of chalk, green sand, etc.,
formed in the Cretaceous period; -- called also the {chalk
formation}. See the Diagram under Geology.
Cretaceous period (Geol.), the time in the latter part of
the Mesozoic age during which the Cretaceous formation was
deposited, and at the end of which the dinosaurs died out.
See Cretaceous.
[1913 Webster +PJC] |
Cretaceous period
(gcide) | Cretacic \Cre*tac"ic\
[Webster 1913 Suppl. +PJC]
Cretaceous acid,
an old name for carbonic acid.
Cretaceous formation (Geol.), the series of strata of
various kinds, including beds of chalk, green sand, etc.,
formed in the Cretaceous period; -- called also the {chalk
formation}. See the Diagram under Geology.
Cretaceous period (Geol.), the time in the latter part of
the Mesozoic age during which the Cretaceous formation was
deposited, and at the end of which the dinosaurs died out.
See Cretaceous.
[1913 Webster +PJC] |
Cretaceously
(gcide) | Cretaceously \Cre*ta"ceous*ly\, adv.
In a chalky manner; as chalk.
[1913 Webster] |
Cretaceous-Tertiary boundary
(gcide) | Cretaceous-Tertiary boundary \Cre*ta"ceous-Tert"i*ar*y
boun"da*ry\ (kr[-e]*t[=a]"sh[u^]s), n.
a thin layer of geologic deposits, of varying thickness in
different parts of the world, found between the geological
strata identified as Cretaceous and the strata above,
identified as Tertiary; also, the time point or period
marking the boundary between the Cretaceous and Tertiary
periods.
Syn: K/T boundary.
[PJC]
Note: According to a theory gaining acceptance (as of 1997),
these deposits were formed as the debris of a large
comet or meteorite impact on the earth, which threw up
a large quantity of dust into the atmosphere, causing
profound though temporary climatic change, and caused
or hastened the extinction of numerous species,
including the dinosaurs. This hypothesis was first
postulated by Luis and Walter Alvarez on the basis of
an excess of iridium found in the boundary layer, and
was later supported by additional evidence of various
types. The impact is believed to have occurred at the
edge of the Yucatan peninsula in Mexico, forming what
is termed the [a
href="http:]/dsaing.uqac.uquebec.ca/~mhiggins/MIAC/chicxulub.htm">Chicxulub
crater, which is partly under the Gulf of Mexico, is
not evident from surface topography, and was detected
primarily by gravity anomaly readings and subsurface
geological characteristics.
[PJC] |
Supercretaceous
(gcide) | Supercretaceous \Su`per*cre*ta"ceous\, a. (Geol.)
Same as Supracretaceous.
[1913 Webster]
[1913 Webster] |
Supracretaceous
(gcide) | Supracretaceous \Su`pra*cre*ta"ceous\, a. (Geol.)
Lying above the chalk; Supercretaceous.
[1913 Webster] |
cretaceous period
(wn) | Cretaceous period
n 1: from 135 million to 63 million years ago; end of the age of
reptiles; appearance of modern insects and flowering plants
[syn: Cretaceous, Cretaceous period] |
|