Having the qualities of chalk; abounding with chalk; chalky; as, cretaceous rocks and formations. See Chalk.
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 Cretacic.
The geologic period dating from 144 million years ago to 65 million years ago. Noted for its deposition of chalks seen at the White Cliffs of Dover.
146-65 million years ago.
the geologic period that ranged from about 135 to 65 million years ago.
The youngest of the three geologic periods of the Mesozoic era (145 to 65 Mya).
The final period of the Mesozoic Era from approximately 135 to 65 million years ago. View timeline of geologic events.
A geologic period roughly 65 to 144 million years b.p. (before the present); the first flowering plant species appeared; the diversity of dinosaurs climaxed. (Dinosaurs died out at the end of the Cretaceous.)
The final period of the Mesozoic. Spans 142-64Ma.
A period in the Mesozoic era; ca. 141 - 65 million years ago.
The most recent of the three periods of the Mesozoic Era – the “age of dinosaurs.” Dinosaurs lived during a relatively short time period, (relative, that is, to the geologic time scale, not to humans) . Dinosaurs roamed the Earth for about 175 million years. This is not a long time considering the Earth is 4.6 billion years old. Humans have been around an even shorter time–less than 2 million years The Mesozoic Era (250 to 65 million years ago) is divided into three periods: 1. the Triassic (250-193 million years ago); 2. the Jurassic (193-136 million years ago); 3. the Cretaceous (136-65 million years ago).
A period of geological time, dating from about 140 to 65 million years ago
the interval of geological time that began about 140 million years (Ma) ago, and lasted about 75 Ma to the KT boundary 65 Ma ago. It is the final period of the Mesozoic Era, and precedes the Tertiary Period.
Period of geologic time 65-136 million years ago.
A Geological epoch from 130 to 65 million years ago.
A time period, (144-65 million years ago. Saw Saskatchewan muddy seas and the first angiosperms.
from 135 million to 63 million years ago; end of the age of reptiles; appearance of modern insects and flowering plants
abounding in chalk
of or relating to the Cretaceous geologic era; "cretaceous rocks"
A geological period from 135 to 65 million years ago.
The last of the Mezosoic Ages. From 144 to 65 million years ago
The geological period from 145 to 65 Ma ago
is a time period approximately 136 to 64 million years ago in the Mesozoic era.
Period of geological time about 144 - 65 million years ago.
Rock units with extensive chalk beds (“Cretace” means chalk). A version of the term was used by d'Omalius d'Halloy for chalks in northern France. Topmost unit in the Mesozoic.
A geological term denoting the interval of Earth history beginning around 145 million years ago and ending 65 million years ago with the formation of the Chicxulub impact structure.
the interval of geological time from about 140 to 65 million years ago. the Cretaceous is the last period of the Mesozoic era and is also the longest geological time period.
third and final epoch of the Mesozoic era, lasting for 65 million years during which chalk deposits were formed and the first flowering plants appeared; from Latin cretaceus from creta, literally 'Cretan earth' or chalk.
The last period of the Mesozoic era, after the Jurassic period of the Mesozoic era and before the Tertiary period of the Cenozoic era. Covers the time from about 135 million years ago to about 65 million years ago. ( Texas Geologic History)
The final period of the Mesozoic era, spanning the time between 145 and 65 million years ago. The name is derived from the Latin word for chalk ("creta") and was first applied to extensive deposits of this age that form white cliffs along the English Channel between Great Britain and France.
See geologic time.
(see Geological Timescale)
Period of Earth's history from 145 to 65 million years ago.
The geologic period from 140 million to 67 million years ago
Tertiary boundary - A major stratigraphic boundry on Earth marking the end of the Mesozoic Era, best known as the age of the dinosaurs. The boundary is defined by a global extinction event that caused the abrupt demise of the majority of all life on Earth.
the period of geologic history following the Jurassic Period and ranging from about 144 million years ago until 65 million years ago.
The last of the three Geologic Periods of the Mesozoic Era. It extends from the end of the Jurassic Period (about 135 million years ago) to the end of the Mesozoic Era at about 65 million years ago.
the period of geological time running from 145 â€“ 65 million years ago. The name comes from the chalk which was the main rock type deposited during this period. See Geological Timescale.
(PERIOD) 136 to 65 million years ago, a subdivision of the Mesozoic Era.
strata of Cretaceous age, mainly soft chalk in our area.
The final period of the Mesozoic era (after the Jurassic and before the Tertiary period of the Cenozoic era), thought to have covered the span of time between 144 and 65 million years ago; also, the corresponding system of rocks. It is named after the Latin word for chalk ("creta) because of the English chalk beds of this age.
The final geological period of the Mesozoic era that began 144 million years ago and ended 65 million years ago. The end of this period is defined most notably by the extinction of the dinosaurs in one of the largest mass extinctions ever to strike the planet.
a geological time period approximately 141 to 65 million years ago.
The final geological period of the Mesozoic. It lasted from 140 Ma until 65 Ma ago. This is the period that saw the dinosaurs (except the birds!), pterosaurs and the ammonites die out. Named after the Latin ( Creata) for chalk, due to the large chalk deposits laid down in Western Europe during this period.
A period of geological time between 140 to 65 Ma;
Geologic period that occurred roughly 65 to 144 million years ago. During this period, the first flowering plant species appear and dinosaurs are at their greatest diversity. Dinosaurs die out at the end of this period.
A period of time stretching from 142 - 65 million years ago. The end of this period (the KT boundary) was marked by the mass extinction of the dinosaurs.
(K) the last period of the Mesozoic Era, from 144-65 Mya. The Early Cretaceous I includes the Berriasian, Valanginian, Hauterivian, and Barremian, Ages. The Early Cretaceous II covers the Aptian and Albian Ages (144-99 Mya). The Late Cretaceous is made up of the Cenomanian, Turonian, Coniacian, Santonian, Campanian, and Maastrichtian Ages (99-65 Mya).
The third an latest of the periods of geological time included in the Mesozoic era.
The Cretaceous Period is one of the major divisions of the geologic timescale, reaching from the end of the Jurassic Period (i.e. from 145.5 Â± 4.0 million years ago (Ma)) to the beginning of the Paleocene epoch of the Tertiary Period (about 65.5 Â± 0.3 Ma). As the longest geological period, the Cretaceous constitutes nearly half of the Mesozoic. The end of the Cretaceous defines the boundary between the Mesozoic and Cenozoic eras.