Of the age of the middle Mesozoic, about 190 to 140 million years ago, including, as divided in England and Europe, the Lias, Oölite, and Wealden; -- named from certain rocks of the Jura mountains. It was noted for the predominance of dinosaurs on land, and the development of the first birds and mammals.
The Jurassic period or formation; -- called also the Jura.
208-146 million years ago
The geological period between about 208 million years and 146 million years. Classically seen as the "age of the dinosaurs" ...nuff said.
A period of geological time, dating from about 205 to 140 million years ago.
The second era of the mesozoic (208-144 MYA).
Period of geologic time 136-190 million years ago.
A Geological epoch from 180 to 135 million years ago.
from 190 million to 135 million years ago; dinosaurs; conifers
The second of the Mesozoic Ages. From 206 to 144 million years ago
The geological period from ~208 to 145 Ma ago
Period of geological time about 213 - 144 million years ago.
Rock units identified by French and Swiss workers in the Jura Mountains. Middle unit in the Mesozoic.
the period of geologic history preceding the Cretaceous and ranging from about 208 until 144 million years ago.
the period of geological time from about 200 to 140 million years ago. The Jurassic is the middle period of the Mesozoic era.
second epoch of the MesoZoic era, lasting for 45 million years during which dinosaurs and ammonites flourished; from French jurassique from the Jura mountain range in eastern France.
A period in the Mesozoic following the Triassic period and prior to the Cretaceous period. It covers a time span from about 190 million years to about 135 million years before present. ( Texas Geologic History)
The middle period of the Mesozoic era, spanning the time between 213 and 145 million years ago. It is named after the Jura Mountains between France and Switzerland, where rocks of this age were first studied.
(see Geological Timescale)
Geological period 295 - 135 million years ago.
Jurassic (joo-rasik)adj. Of, belonging to, or designating the time and deposits of the second period of the Mesozoic Era, characterized by the existence of dinosaurs and the appearance of the earliest mammals and birds.n. The Jurassic Period. [French jurassique after the JURA (MOUNTAINS).
The middle of the three Geologic Periods of the Mesozoic Era. It extends from the end of the Triassic Period (about 195 million years ago) to the beginning of the Cretaceous Period (about 135 million years ago).
the period of geological time running from 213 to 145 million years ago. The name comes from the Jura Mountains on the French-Swiss border, where the most complete section of these rocks is found. See Geological Timescale. Page up
The middle system of the Mesozoic, above the Triassic and below the Cretaceous, thought to have covered the span of time between 200 and 145 million years before present.
Period : Named for the Jura mountains where the first deposits were found. It is the middle period of the Mesozoic Era. From 208 to 145 million years ago. ( more about the Geological Timetable)
a geological time period approximately 205 to 141 million years ago.
One of the geological periods that makes up the Mesozoic era. It lasted from 190 Ma until 140 Ma. Named after the Jura mountains on the Swiss-French border.
A geological period from 210 to 150 million years ago.
Period of geological time from 210-140 Ma;
The period of time extending from 206 to 142 million years ago. During this time, the Dinosaurs evolved to become the most powerful and diverse group of creatures to have lived on Earth to that time.
The second and penultimate period of the Mesozoic era, lasting from 208 to 144 Ma. It precedes the Cretaceous period and follows the Triassic period, and is comprised of the Early (208-187 Ma), Middle (187-163) and Late (163-144 Ma) epochs. It is named from the Jura mountains in France.
The Jurassic Period is a major unit of the geologic timescale that extends from about 199.6 ± 0.6 Ma (million years ago) to 145.4 ± 4.0 Ma, the end of the Triassic to the beginning of the Cretaceous. As with other geologic periods, the rock beds that define the start and end of the period are well identified but the exact dates are uncertain by 5 - 10 million years. The Jurassic constitutes the middle period of the Mesozoic era, also known as the "Age of Dinosaurs".