When did the mesozoic era start

The early Triassic was dominated by mammal-like reptiles such as Lystrosaurus. The Triassic Period (252-201 million years ago) began after Earth's worst-ever extinction event devastated life. The Permian-Triassic extinction event, also known as the Great Dying, took place roughly 252 million years ago and was one of the most significant events ...

After that came the Mesozoic era, and that lasted from the end of the Paleozoic to 65 million years ago, when the earth entered the Cenozoic era. How long was the prehistoric era?The Permian ( / ˈpɜːrmi.ən / PUR-mee-ən) [4] is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period 298.9 million years ago (Mya), to the beginning of the Triassic Period 251.902 Mya. It is the last period of the Paleozoic Era; the following Triassic Period belongs to the ...1 / 11. The Jurassic period (199.6 million to 145.5 million years ago) was characterized by a warm, wet climate that gave rise to lush vegetation and abundant life. Many new dinosaurs emerged—in ...01-Aug-2016 ... ... , information & pictures. When were dinosaurs alive? Learn all about the Triassic, Jurassic & Cretaceous Periods of the Mesozoic Era.By the start of the Devonian period--about 420 million years ago--the evolution of prehistoric fish veered off in two (or three, depending on how you count them) directions. One development, which wound up going nowhere, was the appearance of the jawed fishes known as placoderms ("plated skin"), the earliest identified example of which is …Step by step video, text & image solution for Cretaceous period of the Mesozoic era is characterised by which of the following by Biology experts to help ...Nov 30, 2018 · As we’ve found, the Cretaceous Period is the third of three periods that make up the Mesozoic Era. The first period of the Mesozoic Era was the Triassic Period. It began 251.9 million years ago (Mya) and ended 201.3 Mya. The second period was the Jurassic Period, which spanned from 201.3 Mya to 145 Mya. What major change did animal start to have during the Paleozoic era. ... What plant was the dominant plant during the Mesozoic era? Triassic, Jurassic, cretaceous.

Reading & Lecture Guide # 5: Where Did the Dinosaurs Come From? Life at the End of Paleozoic Era & The Start of Mesozoic: + New Discoveries in Paleontology, Part 1 PowerPoint Lectures & Ch. 4 & 5 cont. KEY CONCEPTS: What factors (hypotheses) have been proposed as causing the end-Permian extinction and what evidence supports each …Bear in mind that raptors weren't the only theropods of the Mesozoic Era; this populous class of dinosaurs also included tyrannosaurs, ornithomimids, and small, feathered " dino-birds ." Then there's the issue of feathers. While it can't be flatly stated that every single genus of raptor had feathers, enough fossils have been unearthed bearing ...It's only after all that that we reach the Mesozoic Era (250-65 million years ago), which includes the Triassic, Jurassic and Cretaceous periods. Ages of the Dinosaurs (The Mesozoic Era) This chart is a simple overview of the Triassic, Jurassic, and Cretaceous periods, all of which were part of the Mesozoic era.144 to 65 Million Years Ago. The Cretaceous is usually noted for being the last portion of the "Age of Dinosaurs", but that does not mean that new kinds of dinosaurs did not appear then. It is during the Cretaceous that the first ceratopsian and pachycepalosaurid dinosaurs appeared. Also during this time, we find the first fossils of many ...From about 300-200 million years ago (late Paleozoic Era until the very late Triassic), the continent we now know as North America was contiguous with Africa, South America, and Europe. They all existed as a single continent called Pangea. Pangea first began to be torn apart when a three-pronged fissure grew between Africa, South America, and North …Mesozoic (252-66 million years ago) means 'middle life' and this is the time of the dinosaurs. This era includes the Triassic, Jurassic, and Cretaceous Periods, names that may be familiar to you. It ended with a massive meteorite impact that caused a mass extinction, wiping out the dinosaurs and up to 80% of life on Earth. Oct 20, 2023 · The Cenozoic Era is generally divided into three periods: the Paleogene (66 million to 23 million years ago), the Neogene (23 million to 2.6 million years ago), and the Quaternary (2.6 million years ago to the present); however, the era has been traditionally divided into the Tertiary and Quaternary periods. Mesozoic Era. The amber specimen HPG-15-1 (Hupoge Amber Museum, China) is quite large, about 9cm long, while the hatchling is small, about 6cm from snout to tail, including...

Jan 29, 2018 · The Permian Extinction. After the Permian Extinction wiped out over 95% of ocean-dwelling species and 70% of land species, the new Mesozoic Era began about 250 million years ago. The first period of the era was called the Triassic Period. The first big change was seen in the types of plants that dominated the land. 04-Oct-2023 ... The Mesozoic era extended roughly 180 million years, from 251 million years ago (Mya) to when the Cenozoic era began 65 Mya. This Era is further ...The Paleozoic (IPA: /ˌpæli.əˈzoʊ.ɪk,-i.oʊ-, ˌpeɪ-/ PAL-ee-ə-ZOH-ik, -⁠ee-oh-, PAY-; or Palaeozoic) Era is the first of three geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma at the start of the Mesozoic Era.When did the Mesozoic era start and end? Mesozoic (252-66 million years ago) means ‘middle life’ and this is the time of the dinosaurs. This era includes the Triassic, Jurassic, and Cretaceous Periods, names that may be familiar to you. It ended with a massive meteorite impact that caused a mass extinction, wiping out the dinosaurs and …

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Dinosaurs. The prehistoric reptiles known as dinosaurs arose during the Middle to Late Triassic Period of the Mesozoic Era, some 230 million years ago. They were members of a subclass of reptiles ...Dinosaurs roamed the Earth in the Mesozoic Era, which is split into the Triassic, Jurassic and Cretaceous periods. They first emerged during the Triassic period around 245 million years ago. At the time, all continents were part of a single land mass – the supercontinent Pangea. Tyrannosaurus rex and pterodactyls (Shutterstock) Tyrannosaurus rex and …The Mesozoic Era began approximately 252 million years ago at the close of the Paleozoic Era and ended 66 million years ago at the dawn of the Cenozoic Era. The Mesozoic is best known as the time of the dinosaurs. Dinosaurs first appeared early in the Mesozoic and came to dominate life on Earth throughout the rest of the era. The Mesozoic is ...Precambrian time ended at the start of the Phanerozoic Eon 541 million years ago, which also marks the start of the Cambrian Period. The Precambrian is not a formal interval of time; rather, it serves as a superinterval that encompasses all time prior to the Cambrian. ... The Mesozoic Era began 252 million years ago, following the Permian mass extinction …09-Jun-2020 ... MESOZOIC ERA : THE AGE OF DINOSAURS ... From the origin of the first life on Earth to the present day, the planet has already experienced several ...Paleozoic Era. In geologic time, the Paleozoic Era, the first era in the Phanerozoic Eon, covers the time between roughly 544 million years ago (mya) and until 245 mya.. The Paleozoic Era spans six geologic time periods including the Cambrian Period (544 to 500 mya); Ordovician Period (500 mya to 440 mya); Silurian (440 mya to 410 mya); Devonian (410 mya to 360 mya); and the Carboniferous ...

The Triassic period was the first period of the Mesozoic era and occurred between 251.9 million and 201.3 ... Plants and insects did not go through any extensive evolutionary advances during ...Triassic Period, Interval of geologic time, c. 252.2–201.3 million years ago, that marks the beginning of the Mesozoic Era. Many new vertebrates emerged during the Triassic, heralding the major changes that were to occur in both terrestrial and marine life forms during the Mesozoic Era. The seas became inhabited by large marine reptiles. On land, …Dec 3, 2021 · Mesozoic: An era in geologic history that contained three related periods which became renowned for their large reptiles: the Triassic (which spanned from 251 to 199.6 million years ago), the Jurassic (which spanned from 199.6 to 145.5 million years ago), and the Cretaceous (which spanned from 145.5 to 65.5 million years ago). Triassic Period, in geologic time, the first period of the Mesozoic Era.It began 252 million years ago, at the close of the Permian Period, and ended 201 million years ago, when it was succeeded by the Jurassic Period.. The Triassic Period marked the beginning of major changes that were to take place throughout the Mesozoic Era, particularly in the distribution of continents, the evolution of ...When did the Mesozoic era begin and end? The Mesozoic Era began 252.2 million years ago, following the conclusion of the Paleozoic Era, and ended 66 million years ago , at the dawn of the Cenozoic Era. ( See the geologic time scale .) The major divisions of the Mesozoic Era are, from oldest to youngest, the Triassic Period, the Jurassic …During the Mesozoic (242–66 million years ago), terrestrial regions underwent a massive shift in their size, position and connectivity. At the beginning of the era, the land masses were joined into a single supercontinent called Pangaea. However, by the end of the Mesozoic, terrestrial regions had become highly fragmented, both owing to the ...The Mesozoic Era (251.9 to 66 million years ago) was the "Age of Reptiles." During the Mesozoic, Pangaea began separating into the modern continents, and the modern Rocky Mountains rose. Dinosaurs, crocodiles, and pterosaurs ruled the land and air. As climate changed and rapid plate tectonics resulted in shallow ocean basins, sea levels rose ... The Permian mass extinction paved the way for another burst of new life at the start of the Mesozoic Era. This era is known as the “age of dinosaurs.” It is divided into three periods. Triassic Period. ... The Mesozoic Era (245–65 million years ago) is called the “age of dinosaurs.” Dinosaurs evolved from reptiles. They flourished after the Triassic …

The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. ... Lying between the Paleozoic and the Cenozoic, "Mesozoic" means "middle animals", ...

Like the Mesozoic era, the early part of the Cenozoic was warm. In the middle of the Tertiary period, the climate began to cool. Ice covered the poles and many mountain tops. At the start of the Quaternary period (Pleistocene epoch) glaciers advanced and retreated many times. They covered as much as 30% of Earth's land surface.The Mesozoic Era began 252.2 million years ago, following the conclusion of the Paleozoic Era, and ended 66 million years ago, at the dawn of the Cenozoic Era. ( See the geologic time scale .) The major divisions of the Mesozoic Era are, from oldest to youngest, the Triassic Period , the Jurassic Period , and the Cretaceous Period . 1 / 11. The Jurassic period (199.6 million to 145.5 million years ago) was characterized by a warm, wet climate that gave rise to lush vegetation and abundant life. Many new dinosaurs emerged—in ...By Youth and Education in Science Mesozoic (252-66 million years ago) means 'middle life' and this is the time of the dinosaurs. This era includes the Triassic, Jurassic, and Cretaceous Periods, names that may be familiar to you.The Paleozoic Era (542 - 251 Ma) was divided into 6 geologic periods. Each was dominated by different types of animals.The Cambrian Period (542 - 488 Ma)The start of the Cambrian was marked with ...Mesozoic: An era in geologic history that contained three related periods which became renowned for their large reptiles: the Triassic (which spanned from 251 to 199.6 million years ago), the Jurassic (which spanned from 199.6 to 145.5 million years ago), and the Cretaceous (which spanned from 145.5 to 65.5 million years ago).Cenozoic (66 million years ago until today) means ‘recent life.’ During this era, plants and animals look most like those on Earth today. Periods of the Cenozoic Era are split into even smaller parts known as Epochs, so you will see even more signposts in this Era. Cenozoic signposts are colored yellow. Triassic Period (240 to 208 million years ago) At the beginning of the Mesozoic Era, the “supercontinent” began to break up. Deserts covered part of the interior, but shallow seas re-invaded the lowlands. Reptiles evolved rapidly, and two important new groups appeared. Therapsids (mammal-like reptiles) gave rise to true mammals by the end ...May 29, 2018 · In geologic time, the Jurassic Period — the middle of three geologic periods in the Mesozoic Era — spans the time from roughly 206 – 208 million years ago (mya) to approximately 146 mya. The Jurassic Period contains three geologic epochs. The earliest epoch, the Lias Epoch, ranges from the start of the Jurassic Period to approximately 180 ...

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At the beginning of the Mesozoic Era during the Triassic, the ocean’s reefs were hard hit by the Permian extinction. It took millions of years for new, diverse seafloor ecosystems to evolve. By the time of the Jurassic, the seafloor was again thriving, but the reef's composition was different than the reefs we think of today.The Cenozoic Era began when the dinosaurs from the Mesozoic Era became extinct, around 65.5 million years ago. The Cenozoic Era continues to the present day. Register to view this lessonAt the start of the Triassic period, 250 million years ago, ... The longest period of the Mesozoic Era, it was also during the Cretaceous that the Earth began to assume something resembling its modern form. At that time, life was dominated not by mammals but by terrestrial, marine and avian reptiles. Geography and Climate During …The Mesozoic Era lasted about 180 million years, from about 245 million years ago to about 65 million years ago. The Mesozoic is divided into just three time periods: the Triassic, …Apr 10, 2022 · The Mesozoic era is an era of time between the Paleozoic and Cenozoic eras. The Cenozoic is the current era humans live in. The Mesozoic era is divided into three periods - the Triassic, Jurassic ... It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of the entire Phanerozoic. The name is derived from the Latin creta, ... Start (base) End (top) Definition Etymology Late Cretaceous: Maastrichtian: 72.1 ± 0.2 66.0: top: iridium anomaly at the …The Mesozoic Era lasted about 180 million years, from about 245 million years ago to about 65 million years ago. The Mesozoic is divided into just three time periods: the Triassic, the Jurassic, and the Cretaceous. Since lots of things were going on in each time period, we can only summarize the events. You can learn more by going to your ...The Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras. The Geologic Time Scale is the history of the Earth broken down into four spans of time marked by various events, such as the emergence of certain species, their evolution, and their extinction, that help distinguish one era from another. Strictly speaking, Precambrian Time is not an ...In the Mesozoic Era (about 252 million to 66 million years ago), the most important of the synapsids were the archosaurs, or “ruling reptiles,” and the therapsids were, in general, small active carnivores. Therapsids tended to evolve a specialized heterodont dentition (that is, a set of teeth separated into molars, incisors, and canines) and to improve the …Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, 541 million years ago. The Precambrian encompasses the Archean and Proterozoic eons, which are formal geologic intervals that lasted from 4 billion to about 541 million years ago, and the ...CO 2 concentrations have been high during periods of particularly warm climate (such as during most of the Mesozoic era and the Eocene epoch) and low during times of cold climate, including the major epochs with periodic glaciations (namely, the Permo-carboniferous and late Cenozoic glaciations), as illustrated in Figure 5.11 and Figure 14.1 in ... ….

The Mesozoic era began roughly around the time of the end-Permian extinction, which wiped out 96 percent of marine life and 70 percent of all terrestrial species on the planet.Tech. Science News. Menu. All Stories. Collections. Explainers. Word of the Week. Experiments. Analyze This. Technically Fiction. Action for Earth. Cool Jobs. …At least two Tethyan seas successively occupied the area between Laurasia and Gondwana during the Mesozoic Era. The first, called the Paleo-Tethys Sea, or Paleo-Tethys Ocean, was created during the convergence of all landmasses into what would become the supercontinent of Pangea late in the Paleozoic Era. During the Permian and …The Sharks of the Mesozoic Era . Considering how common they were during the preceding geologic periods, sharks kept a relatively low profile during most of the Mesozoic Era, because of intense competition from marine reptiles like ichthyosaurs and plesiosaurs. By far the most successful genus was Hybodus, which was built for survival: …Life During the Paleozoic. The Paleozoic Era is literally the era of “old life.”. It lasted from 544 to 245 million years ago and is divided into six periods. Major events in each period of the Paleozoic Era are described in Figure below. The era began with a spectacular burst of new life.Paleozoic (541-252 million years ago) means ‘ancient life.’. The oldest animals on Earth appeared just before the start of this era in the Ediacaran Period, but scientists had not yet discovered them when the geologic timescale was made. Life was primitive during the Paleozoic and included many invertebrates (animals without backbones) and ...At the start of the period, ... In fact, the land, seas, and skies would never be the same in the new era that dawned after the close of the Mesozoic era. Share Tweet Email.It is the last period of the Paleozoic Era; the following Triassic Period belongs to the Mesozoic Era. The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison, who named it after the region of Perm in Russia. The Permian ... At the start of the Permian, the Earth was still in the Late Paleozoic icehouse, which began in …Dinosaurs roamed the Earth in the Mesozoic Era, which is split into the Triassic, Jurassic and Cretaceous periods. They first emerged during the Triassic period around 245 million years ago. At the time, all continents were part of a single land mass – the supercontinent Pangea. Tyrannosaurus rex and pterodactyls (Shutterstock) Tyrannosaurus rex and … When did the mesozoic era start, The Mesozoic Era is one of three geologic eras of the Phanerozoic eon. ... Lying between the Paleozoic and the Cenozoic, "Mesozoic" means "middle animals", ..., ii A third proposed start date is the Great Acceleration, or the beginning of the nuclear age in the mid-1940s. In this period, not only did our testing and use of atomic weaponry leave a distinctive radioactive signature in the sediments of Earth, but almost all human activities from water use to fertilizer consumption to globalization saw a dramatic …, Mesozoic: An era in geologic history that contained three related periods which became renowned for their large reptiles: the Triassic (which spanned from 251 to 199.6 million years ago), the Jurassic (which spanned from 199.6 to 145.5 million years ago), and the Cretaceous (which spanned from 145.5 to 65.5 million years ago)., The Cretaceous is defined as the period between 145.5 and 65.5 million years ago,* the last period of the Mesozoic Era, following the Jurassic and ending with the extinction of the dinosaurs (except birds). By the beginning of the Cretaceous, the supercontinent Pangea was already rifting apart, and by the mid-Cretaceous, it had split into ..., 2010 [7] The Triassic ( / traɪˈæsɪk / try-ASS-ik; sometimes symbolized 🝈) [8] is a geologic period and system which spans 50.5 million years from the end of the Permian Period 251.902 million years ago ( Mya ), to the beginning of the Jurassic Period 201.4 Mya. [9] The Triassic is the first and shortest period of the Mesozoic Era. , The Paleozoic Era - green signposts; The Mesozoic Era - blue signposts; The Cenozoic Era - yellow signposts; Each Era is split into even smaller parts known as Periods and Epochs. These boundaries were first defined by the appearance (evolution) or disappearance (extinction) of fossil species in rocks., What Was the Mesozoic Era? Dinosaurs lived about 250 million years ago during the Mesozoic Era. During the Mesozoic Era, the world looked very different than it does now. ... At the start of the ..., Mesozoic The middle of three eras that constitute the Phanerozoic period of time. The Mesozoic (literally ‘middle life’) was preceded by the Palaeozoic Era and …, 6 mile wide asteroid as big as Mt Everest as fast as a speeding bullet crashed into the earth 65 million years ago, ending the Cretaceous Period (and mesozoic era) Study with Quizlet and memorize flashcards containing terms like Periods of the Mesozoic, When, What did the Mesozoic Era start and end with? and more., Spanning around 200 million years, the Mesozoic Era was characterized by rapid evolution of life on the Earth, most noteworthy being the rise and fall of the dinosaurs. In the plant kingdom, the flowering plants appeared for the first time. Read this ScienceStruck article to know more about various characteristics of this era, like the plants, animals, climatic conditions, and major events. , Generally, the eras used to describe the modern Earth are the Quaternary geological era and the Cenozoic evolutionary era. In the future, there may also be a historical era that the current time period, the 21st century, will belong to., Non-bird dinosaurs lived between about 245 and 66 million years ago, in a time known as the Mesozoic Era. This was many millions of years before the first modern humans , Homo sapiens, appeared. Scientists divide the Mesozoic Era into three periods: the Triassic, Jurassic and Cretaceous., 6 mile wide asteroid as big as Mt Everest as fast as a speeding bullet crashed into the earth 65 million years ago, ending the Cretaceous Period (and mesozoic era) Study with Quizlet and memorize flashcards containing terms like Periods of the Mesozoic, When, What did the Mesozoic Era start and end with? and more., Anapsid, synapsid, and diapsid reptiles pursued very different paths toward the start of the Mesozoic Era. Today, the only living relatives of the anapsids are turtles and tortoises, though the exact nature of this relationship is hotly disputed by paleontologists. The synapsids spawned one extinct reptilian line, the pelycosaurs, ..., The Mesozoic Era spanned 252 to 66 million years ago a tiny part of the Earth's long history. Imagine yourself at the dawn of the Mesozoic about 250 million years ago. Most large animals are reptiles rather than mammals; there are no dinosaurs, no bird sounds, and no flowers to pick or grass to mow. , The Mesozoic Era (252 to 66 million years ago) The Mesozoic Era is the geological period between 252 million and 66 million years ago and is subdivided into three epochs: the Triassic, Jurassic, and Cretaceous. The Mesozoic Era is often referred to as the Age of Reptiles because most dinosaurs lived there., The Paleozoic (IPA: /ˌpæli.əˈzoʊ.ɪk,-i.oʊ-, ˌpeɪ-/ PAL-ee-ə-ZOH-ik, -⁠ee-oh-, PAY-; or Palaeozoic) Era is the first of three geological eras of the Phanerozoic Eon. Beginning 538.8 million years ago (Ma), it succeeds the Neoproterozoic (the last era of the Proterozoic Eon) and ends 251.9 Ma at the start of the Mesozoic Era. , The Mesozoic (meaning "middle animals") era extends from about 251 million years ago mya to 65 mya and is separated into three geologic periods: Triassic, Jurassic, and Cretaceous. It is often called the "Age of the Dinosaurs ," after the dominant fauna of the era. , At the start of the Mesozoic, the continents were all joined together forming one large continent called Pangaea. During Mesozoic time, they pulled apart ..., The Permian ( / ˈpɜːrmi.ən / PUR-mee-ən) [4] is a geologic period and stratigraphic system which spans 47 million years from the end of the Carboniferous Period 298.9 million years ago (Mya), to the beginning of the Triassic Period 251.902 Mya. It is the last period of the Paleozoic Era; the following Triassic Period belongs to the ..., The Paleozoic Era (542 - 251 Ma) was divided into 6 geologic periods. Each was dominated by different types of animals.The Cambrian Period (542 - 488 Ma)The start of the Cambrian was marked with ..., The Cretaceous period was the last and longest segment of the Mesozoic era. It lasted approximately 79 million years, from the minor extinction event that closed the Jurassic period about 145 ..., Sep 29, 2023 · Triassic Period, in geologic time, the first period of the Mesozoic Era. It began 252 million years ago, at the close of the Permian Period, and ended 201 million years ago, when it was succeeded by the Jurassic Period. The Triassic Period marked the beginning of major changes that were to take place throughout the Mesozoic Era, particularly in ... , The Triassic period, Jurassic period, and Cretaceous period each encompass about 50 to 80 millions years on a geologic time scale. The name ‌ Mesozoic ‌ means “middle life,” as it falls between the ‌ …, Paleozoic Era. In geologic time, the Paleozoic Era, the first era in the Phanerozoic Eon, covers the time between roughly 544 million years ago (mya) and until 245 mya.. The Paleozoic Era spans six geologic time periods including the Cambrian Period (544 to 500 mya); Ordovician Period (500 mya to 440 mya); Silurian (440 mya to 410 mya); Devonian (410 mya to 360 mya); and the Carboniferous ..., From about 300-200 million years ago (late Paleozoic Era until the very late Triassic), the continent we now know as North America was contiguous with Africa, South America, and Europe. They all existed as a single continent called Pangea. Pangea first began to be torn apart when a three-pronged fissure grew between Africa, South America, and North …, In geologic time, the Jurassic Period — the middle of three geologic periods in the Mesozoic Era — spans the time from roughly 206 – 208 million years ago (mya) to approximately 146 mya. The Jurassic Period contains three geologic epochs. The earliest epoch, the Lias Epoch, ranges from the start of the Jurassic Period to approximately 180 ..., Mesozoic means “middle life,” and its fossils are a mixture of extinct groups and modern groups of animals and plants. Paleozoic Era. paleozoic-era. The ..., Updated on January 29, 2018 Following both the Precambrian Time and the Paleozoic Era on the Geologic Time Scale came the Mesozoic Era. The Mesozoic Era is sometimes called the "age of the dinosaurs" because dinosaurs were the dominant animals for much of the era. The Permian Extinction, Dinosaurs. The prehistoric reptiles known as dinosaurs arose during the Middle to Late Triassic Period of the Mesozoic Era, some 230 million years ago. They were members of a subclass of reptiles ..., The Mesozoic Era is the last era in which dinosaurs roamed the Earth. Explore the Triassic, Jurassic, and Cretaceous periods that comprise the Mesozoic Era and learn what life …, pangaea and weather during the mesozoic era The dinosaurs evolved early in the Mesozoic Era , during the Triassic period (about 228 million years ago). At the start of the Mesozoic Era, the continents of the Earth were jammed together into the supercontinent of Pangaea; this land mass had a hot, dry interior with many deserts., Table of Contents. What Is the Mesozoic Era? Animals in the Mesozoic Era. Plants in the Mesozoic Era. Mesozoic Era Geology. The End of the Mesozoic Era. …