Mesozoic era


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See also: Geologic Timescale (table)Geologic Timescale
Era Period Epoch Approximate duration
(millions of years)
Approximate number of years ago
(millions of years)

Cenozoic Quaternary Holocene 10,000 years ago to the present  
Pleistocene 2 .
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Mesozoic era

(mĕz'əzō`ĭk) [Gr.,=middle life], major division of geologic time (see Geologic TimescaleGeologic Timescale
Era Period Epoch Approximate duration
(millions of years)
Approximate number of years ago
(millions of years)

Cenozoic Quaternary Holocene 10,000 years ago to the present  
Pleistocene 2 .
..... Click the link for more information.
, table) from 65 to 225 million years ago. Great crustal disturbances that marked the close of the Paleozoic and the beginning of the Mesozoic eras brought about drastic changes in the topography of North America. The Appalachian geosyncline, or downward thrust of the earth's crust, was replaced by the Appalachian Mts., and the eastern part of the continent was elevated during most of the era. The Appalachians were subjected to erosion, the products of which were deposited along the Atlantic coast, which had become a lowland region, or in the ocean beyond. Aside from the Appalachians, the other dry (consistently) areas of the continent were the Canadian Shield, the Antilles areas, and a mountain range elevated in part of the Cordilleran geosyncline. The Mesozoic tectonic activity included numerous subduction zones, such as those along the Pacific margin of the supercontinent Pangaea. Later, Pangaea began to split into the supercontinents of Gondwanaland and Laurasia, and N Africa began to rift apart. By the late Mesozoic, tectonic activity increased dramatically: the new Indian Ocean began to open, the Atlantic Ocean began to open along an extensive rift zone separating the Americas from Europe and Africa (see seafloor spreadingseafloor spreading,
theory of lithospheric evolution that holds that the ocean floors are spreading outward from vast underwater ridges. First proposed in the early 1960s by the American geologist Harry H.
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). The life of the Mesozoic was dominated by the reptiles that evolved into the large land-dwelling dinosaurs of the Jurassic and Cretaceous periods. Flying reptiles and birds first appeared during the Mesozoic. Mammals probably evolved from some common ancestor of the reptiles early in the Triassic Period, but were subordinate to the reptiles until the end of the era, when the dominance of reptiles was ended by the extinction of the dinosaurs. Conifers dominated the plant life, with modern pines and sequoias first appearing. Flowering plants, deciduous trees, and grasses also appeared during this era.
References in periodicals archive ?
Then came the Cretaceous period, 70 million years ago, when the climate cooled and the continents separated, changing vegetation and possibly contributing to the demise of the dinosaurs, which were completely gone by the time of the Mesozoic era, with its ferns, palms and animals such as snakes, turtles, amphibians and the first birds.
At Restless Planet they're creating a variety of spectacular, themed rides, including a river raft journey back to the Mesozoic era through the Triassic, Jurassic and Cretaceous periods.
Featuring life during the Mesozoic Era (250 to 65 million years ago), the galleries' most conspicuous exhibits are the dinosaur specimens, the largest and most popular fossils of this age.
So, because your kids think you personally are responsible for homeless polar bears and that mummy and daddy are Mesozoic era reptiles that belong in a glass case, the Range Rover has to go.
Coria, Patagonian Mesozoic Reptiles is an amazing scientific text revealing the latest findings concerning dinosaurs that lived in the Patagonian region during the Mesozoic era. Numerous black-and-white illustrations and a handful of color plates enliven this scholarly collection of essays by a diverse array of authors.
A critical study of these sections has provided interesting informations highlighting the nature of events that occurred during the terminal Cretaceous times, marking the close of Mesozoic era along the western margin of the Indian sub-continent.
So I opted to go back to the Mesozoic era, that's 75 million years ago to you and me, with zoologist Nigel Marven to the Gobi Desert.
Alabama rocks contain sedimentary and structural clues that reflect the significant tectonic events that have shaped the southern margin of North America, including the removal by rifling of the Argentine Precordillera during Cambrian times, the thrusting, faulting, and sedimentation accompanying the assembly of Pangaea along the Suwannee-Wiggins Suture zone during the late Paleozoic Era, amid the rifting dynamics that created the Gulf of Mexico during the breakup of Pangaea in the early part of the Mesozoic Era. In addition.
The teacher describes an instructional unit in which students designed a complex, interactive display showing what life may have been like during the Mesozoic Era. The researcher and the teacher illuminate elements of design within the activity offering explanation for the power and effectiveness of the pedagogical activity.
"The metaphorical portrayal of the dinosaur in the early 21st Century is much more violent and less secure than were the real dinosaurs of the Mesozoic era."
During the Mesozoic era and Cenozoic period, various metallic resources were formed by mineralisation related to the intrusion of volcanogenic and igneous rock.
It has been traditional, although at the same time simplistic and mistaken, to attribute the characteristics of present-day reptiles to the great reptiles of the Mesozoic Era. We have, therefore, always thought of the dinosaurs of that time as being relatively inactive, slow-moving, and incapable of regulating their own body temperatures.