1 Şub 2020 ... Mesozoic bone consistently yields a falsely young radiocarbon “date” of a few thousand to a few tens of thousands of years, despite the fact ...It's a dream come true for all young dino-fans: a CGI-animated series called Dinosaur Train brings the natural sciences, including history and paleontology, to life. Aimed at preschoolers, this new PBS Kids series, co-produced by the Jim Henson Co., includes 40 half-hour episodes featuring live-action and paleontologist Dr. Scott …Explore the fascinating world of carnivorous dinosaurs in this educational video. Join us as we delve into the lives of these incredible prehistoric predator...Dec 3, 2021 · hadrosaur: A duck-billed, plant-eating dinosaur that lived during the late Cretaceous Era. Jurassic: Lasting from about 200 million to 145.5 million years ago, it’s the middle period of the Mesozoic Era. This was a time when dinosaurs were the dominant form of life on land. The Mesozoic Era is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Periods. It is characterized by the dominance of archosaurian reptiles , such as the dinosaurs ; an abundance of gymnosperms , (such as ginkgoales , bennettitales ) and ferns ; a hot greenhouse climate ... Dinosaur communities were separated by both time and geography. The 'Age of Dinosaurs' (the Mesozoic Era) included three consecutive geologic time periods (the Triassic, Jurassic, and Cretaceous Periods). Different dinosaur species lived during each of these three periods.The Mesozoic Era (251.9 to 66.0 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. Dinosaur communities were separated by both time and geography. The 'Age of Dinosaurs' (the Mesozoic Era) included three consecutive geologic time periods (the Triassic, Jurassic, and Cretaceous Periods). Different dinosaur species lived during each of these three periods.Produce a dazzling display of Mesozoic monsters with this fascinating collection created for young dinosaur fans. Just the right size for little hands and printed on special translucent paper, the clearly outlined illustrations in this stained glass coloring book include the long-necked Apatosaurus (also known as Brontosaurus), a flying …Dinosaur communities were separated by both time and geography. The 'Age of Dinosaurs' (the Mesozoic Era) included three consecutive geologic time periods (the Triassic, Jurassic, and Cretaceous Periods). Different dinosaur species lived during each of these three periods.Jul 19, 2023 · Dr Jordan Mallon, a co-author of the study, based at the Canadian Museum of Nature, said: “This new fossil teaches us that in the Mesozoic ‘age of dinosaurs’, dinosaurs were not always king. Visitors stand at the feet of some of the world's largest dinosaurs immersed in a prehistoric snapshot that surrounds them in a predator-versus-prey clash.Find many great new & used options and get the best deals for 1993 Redstone Dinosaurs: The Mesozoic Era Mesozoic Era #8 0b5 at the best online prices at eBay! Free shipping for many products!Over the course of the Mesozoic, dinosaurs constantly evolved and went extinct. Doing some quick and rough estimates, and assuming 1,000 species of dinosaurs lived at any one time, and then that ...Dinosaur tracks were rst observed and gured by Native Americans by, if not before, the seven ... (eds) Mesozoic birds: above the head of dinosaurs. Univ California Press, Berkeley Lockley MG, Wright J (2003) Pterosaur swim tracks and other ichnological evidence of behavior and ecology. In: Buffetaut E (ed) Evolution and paleobiology of ...--Horn Book, The Informational tidbits appear alongside exquisitely designed pop-up constructions in this visually stunning overview of all things dinosaur. --School Library Journal With Sabuda lending deft paper engineering to artwork rendered by Reinhart, who also wrote the book's text, the Mesozoic's major players leap into three dimension.Jurassic Period, second of three periods of the Mesozoic Era. Extending from 201.3 million to 145 million years ago, the Jurassic was a time of global change in the continents, oceanographic patterns, and biological systems. On land, dinosaurs and flying pterosaurs dominated, and birds made their first appearance.Dinosaurs lived during the Mesozoic Era (252 to 66 million years ago), often called the “Age of Dinosaurs.”. The Mesozoic Era is divided into three time periods, the Triassic, Jurassic, and Cretaceous. The Utah Geological Survey recognizes the presence of over 27 sequential, non-overlapping dinosaur faunas spanning 165 million years from ... Common Mesozoic fossils include dinosaur bones and teeth, and diverse plant fossils. The Mesozoic Era is further divided into three Periods: the Triassic, the Jurassic, and the Cretaceous. Park fossils document dinosaurs from the Late Triassic (approximately 210 million years ago) to the end of the Cretaceous (66 million years ago). 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. Apr 17, 2020 · Findings from a 2012 study on moa bones show an organism’s genetic material deteriorates at such a rate that it halves itself every 521 years. This speed would mean paleontologists can only hope ... 1,009 likes, 3 comments - creativebeaststudio on October 20, 2021: "New Beasts of the Mesozoic: Tyrannosaur Series Kickstarter update today, 'Moros intrepidus is UNL..." David Silva on Instagram: "New Beasts of the Mesozoic: Tyrannosaur Series Kickstarter update today, 'Moros intrepidus is UNLOCKED and the final 48 hour countdown has begun!19.2 †Archaeopteryx, Mesozoic Avialans, and the Mosaic Evolution of Avian Characters —Discovery of †Archaeopteryx —Cretaceous avialans —Mosaic evolution of some avialan characters —Other avian features —Body size 19.3 Evolution of Powered Flight —How-and why-birds got off the ground —Gliding and flying by other Mesozoic paraviansExplore the fascinating world of carnivorous dinosaurs in this educational video. Join us as we delve into the lives of these incredible prehistoric predator...The Mesozoic was a time when dinosaurs dominated the planet, but amphibians were still around—they just weren’t as numerous or diverse as they had been in earlier periods. The Mesozoic era began 252 million years ago and ended 66 million years ago. During this time, amphibians ranged in size from 2 inches to over 13 feet long.The Mesozoic is an era that started at 252.2 million years ago to 65.5 million years ago, and is composed of the Triassic Period, the Jurassic Period, and the Cretaceous Period. The Mesozoic was a place of giants, with dinosaurs ruling the world. They first evolved from Archosaurs into dinosaurs during the Triassic Period, turned larger Find many great new & used options and get the best deals for 1993 Redstone Dinosaurs: The Mesozoic Era Mesozoic Era #8 0b5 at the best online prices at eBay! Free shipping for many products!Buy Beasts of the Mesozoic 1/18 scale Dinosaur Model Toy Collection at Aliexpress for . Find more , and products. Enjoy ✓Free Shipping Worldwide!The Museum’s first T. rex, created in the 1960s, was based on the existing evidence: three very incomplete skeletons. Today, over 30 skeletons have been discovered, so in 2001, a new, more accurate model was created and is now displayed. In addition to models, explore fossil clues — such as bones, footprints, and even dinosaur dung! Take a thrilling dive into the ancient world of Allosaurus with this captivating and informative short! Explore the remarkable features and fearsome nature o...Examples of Mesozoic Era animals include dinosaurs, pterosaurs, ammonites, sharks, plesiosaurs, ichthyosaurs, mosasaurs, pseudosuchians, insects, and early mammals. Although dinosaurs were the dominant land animals of the Mesozoic Era, many other important animal groups evolved and thrived during this time. On this page is a list of Mesozoic ...Jan 20, 2019 · 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. In brief, this incredibly long period of time, measured in "mya" or "millions of years ago," saw the development of dinosaurs, marine reptiles, fish, mammals, flying animals ... 1,823 likes, 11 comments - facts_dinosaurs on October 26, ... #ceratosaurus #jurassic #jurassicperiod #morrisonformation #Mesozoic #dinosaur. Edited · 18w. ali.sardari1399. Direct.Hi. What animal can you tell me. 23w Reply. silviocat2010. @facts_dinosaurs what is that on its head? They not horns what is physical descriptionMay 5, 2023 · Back in the times when 25-meter-long ocean dinosaurs swam the seas and the T-Rex and Triceratops roamed the ground we walk today, Earth was a hot place to live. Very hot. During this Mesozoic Era ... Apr 30, 2023 · About 230 million years ago, dinosaurs, also known as “terrible lizards,” diversified on Earth and They inhabited it in the Mesozoic era. For more than 130 million years, were the dominant vertebrates on the planet, but the mass extinction of the Cretaceous-Paleogene it wiped out most of the dinosaur species. This is a list of non-avian dinosaurs whose remains have been recovered from Africa. Africa has a rich fossil record, but it is patchy and incomplete. It is rich in Triassic and Early Jurassic dinosaurs. African dinosaurs from these time periods include Megapnosaurus, Dracovenator, Melanorosaurus, Massospondylus, Euskelosaurus, Heterodontosaurus, Abrictosaurus, and Lesothosaurus. In the Middle ...17 Nis 2020 ... But it may contain something never before seen from the depths of the Mesozoic era: degraded remnants of dinosaur DNA. Genetic material is ...Explore the fascinating world of carnivorous dinosaurs in this educational video. Join us as we delve into the lives of these incredible prehistoric predator...These ancient giants, which thrived during the Mesozoic (Late Cretaceous) Era, were a diverse group of herbivorous dinosaurs characterized by their distinctive skull ornamentation. Ceratopsia comes from the Greek words keras meaning horn, and ops meaning face, a fitting name considering their prominent cranial features.Some early reptiles that lived in the Mesozoic Era are actually thought to be dinosaurs by many people. A good example is the well-known Mosasaurus. They lived during the Mesozoic Era, which can be broken down into three periods: Triassic (225 million years ago) Jurassic (200 to 145 million years ago) Cretaceous (145 to 65 million years ago)Length: Approximately 7-9 meters (23-30 feet) We start our list of dinosaurs with Abelisaurus, a predatory theropod dinosaur of the late Cretaceous Period. Abelisaurus was a medium-sized, bipedal* dinosaur that was probably between 7 and 9 metres (23 and 29 ft.) in length. * An animal is said to be ‘bipedal’ if it walks on two legs.The sites of fossilized dinosaurs across the southern South Korean coast is a tentative UNESCO World Heritage site registered by the South Korean government since 2002. Although the evidence is rare, fossils reveal that there were dinosaurs in South Korea. The ancient remains of dinosaurs are located within a beautiful display of nature that includes petrified wood, the tracks of extinct ...View IMG_8146.jpeg from GEOL MISC at Richland Community College. Evolution: Evidence of Change The Geologic Time Scal€ Use : the - info r mation 1 frotn - below the diagram . NMiltions of 'ears13 Eyl 2016 ... The Mesozoic World: Ep 1, Dawn Of The Dinosaurs. 40 Favourites 25 Comments 5.7K Views. dinosaurseoraptortriassichyperodapedonscutosaurus ...Find many great new & used options and get the best deals for Encyclopedia Prehistorica Dinosaurs : The Definitive Pop at the best online prices at eBay! ... the Mesozoic's major players leap into three dimension. --Booklist Frills, spikes, wings, and horns burst from the pages of this pop-up book in fabulous, intricate symmetry ...During the Mesozoic Era (a period of more than 180 million years that included the Triassic, Jurassic, and Cretaceous periods), a species of non-avian dinosaur evolved into a …When people think of dinosaurs, their immediate response is to picture a massive, scaly monster running after its prey while emitting a terrifying roar. Perhaps the prompt brings to mind the scene in Jurassic Park where the raptors are in t...Many also believe that sea dragons evolved eventually into marine reptiles in the Mesozoic period. If dragons did exist, they would look similar to lizards or dinosaurs, depending on the species.Thank you so much for watching my video!did you know? this was livestreamed before being edited and being uploaded to youtube?you can find me here!🔽🔽🔽🔽🔽...The Mesozoic was a time when dinosaurs dominated the planet, but amphibians were still around—they just weren’t as numerous or diverse as they had been in earlier periods. The Mesozoic era began 252 million years ago and ended 66 million years ago. During this time, amphibians ranged in size from 2 inches to over 13 feet long. Oct 22, 2019 · Minmi. Fossils of the Minmi have been found in Queensland, Australia. No, its name isn't a reference to Mini-Me, Dr. Evil's tiny doppelganger in the Austin Powers movies. But it might as well be: As ankylosaurs go, Minmi was wee, "only" about 10 feet long and 500 to 1,000 pounds. -Mesozoic era is dinosaurs Marine Geology Ocean Bathymetry (measuring ocean bottom depth) Single-beam sonar creates a tractline Multi-beam sonar creates a swath Towed multi-beam sonar creates a high-res swath Earth Structure Rigid outer crusts floats on denser mantle Mantle, solid but ductile layer that can flow on long time scalesDuring the Mesozoic Era (a period of more than 180 million years that included the Triassic, Jurassic, and Cretaceous periods), a species of non-avian dinosaur evolved into a species of avian dinosaur. This avian dinosaur is the first bird and the forerunner of all birds. Every non-avian dinosaur went extinct 66 million years ago.Flickr. Prosauropods were the small, ancient, bipedal progenitors of the giant, four-legged sauropods and titanosaurs that dominated the later Mesozoic Era. On the following slides, you'll find pictures and detailed profiles of over 30 prosauropod dinosaurs, ranging from Aardonyx to Yunnanosaurus. 02. of 32.DINOSAUR FACTS: Length: up to 12.4m (40.7 ft). Weight: 7,000kg (15,500lbs). Location: Western North America. Time period: Late Cretaceous. Discovered: 1902 by Barnum Brown. The most famous dinosaur of all-time, Tyrannosaurus rex was among the largest land predators to ever exist. Despite it having the strongest estimated bite force of any ...New discoveries of relatively complete dinosaurs from Queensland are now putting Australia on the global dinosaur map and opening up a ‘new frontier’ for dinosaur research. A Gondwanan heritage At the beginning of the Mesozoic, Gondwana formed the southern part of the single continent Pangaea.Dinosaurs lived during the Mesozoic Era (252 to 66 million years ago), often called the “Age of Dinosaurs.”. The Mesozoic Era is divided into three time periods, the Triassic, Jurassic, and Cretaceous. The Utah Geological Survey recognizes the presence of over 27 sequential, non-overlapping dinosaur faunas spanning 165 million years from ...Jurassic Dinosaurs: Introduction (Scroll down to see the dinos!) The Jurassic Period is the second of the three periods of the Mesozoic Era. At the end of the preceding Period – the Triassic Period – there had been a mass extinction of species.19.2 †Archaeopteryx, Mesozoic Avialans, and the Mosaic Evolution of Avian Characters —Discovery of †Archaeopteryx —Cretaceous avialans —Mosaic evolution of some avialan characters —Other avian features —Body size 19.3 Evolution of Powered Flight —How-and why-birds got off the ground —Gliding and flying by other Mesozoic paraviansThe Mesozoic Era (251.9 to 66.0 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.TMNT Cave Turtles Don Mesozoic Mace Weapon Accessory 1993. Bin. R fromJul 18, 2023 · Mesozoic mammals are commonly depicted as having lived in the shadows of their larger dinosaurian contemporaries, and dinosaur gut contents containing the remains of small mammals bear this out 1 ... The third Mesozoic period, the Cretaceous, lasted from 146 million to 65 million years ago. This was the golden age of dinosaurs; nearly half of all the dinosaurs we know about lived during the last 15 million years of the Cretaceous period. Pangea has broken into two large continents, and we are drifting toward our current global destination.Period: Late Cretaceous. Size: 36 ft. / 11 m. Cool feature: Named after the great white shark. Carcharodontosaurus was a large theropod dinosaur that roamed North Africa in the Late Cretaceous. This fearsome predator weighed up to 15 metric tonnes (16.5 tons), and was probably both heavier and longer than T. rex.Dinosaurs: Modeling the Mesozoic Permanent Exhibit . Our Museum Exhibits team has thoroughly reviewed every exhibit component throughout the entire Museum to assess its safety and risk for transmission. As a result, some exhibits and venues, such as Dinosaurs, have been modified for your safety.10 Haz 2023 ... The rapid flowering of these plants began in the #Mesozoic and lasted until the end of the Early Cretaceous period. Therefore, the Mesozoic ...For most dinosaurs, clutches consisted of a single layer of spherical to sub-spherical, highly porous eggs that were probably fully buried. Both eggs and clutch form change drastically with pennaraptoran theropods, the clade that includes birds. Here, far less porous, more elongate eggs are arranged with additional complexity, and only partially buried.Dinosaur communities were separated by both time and geography. The 'Age of Dinosaurs' (the Mesozoic Era) included three consecutive geologic time periods (the Triassic, Jurassic, and Cretaceous Periods). Different dinosaur species lived during each of these three periods.What does not provide actual age of fossil record after dinosaurs became extinct. ... mesozoic. Another similar to a different characters are. Mention of the rock art sites in the folds, and similar experience on the size of fossils buried in a mineral that. We determine whether or site dates for estimating the.1 Şub 2020 ... Mesozoic bone consistently yields a falsely young radiocarbon “date” of a few thousand to a few tens of thousands of years, despite the fact ...Jul 20, 2023 · Compared to the massive, magnificent dinosaurs of the Mesozoic era, ancient mammals are often thought of as little more than beady-eyed pipsqueaks scurrying around in the larger reptiles’ shadows. ... Mesozoic Super-Dinosaur Fossil Dig Kit. This dinosaur discovery kit is a fun introduction and hands-on activity for your child to learn what it's like to be ...Herbivorous dinosaurs were a diverse group of dinosaurs that evolved a variety of adaptations for feeding on vegetation during the Mesozoic Era. These dinosaurs were found in many different groups, including sauropods, ornithischians, and some theropods. Some of the most well-known herbivorous dinosaurs include: 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. In brief, this incredibly long period of time, measured in "mya" or "millions of years ago," saw the development of dinosaurs, marine reptiles, fish, mammals, flying animals ...Jan 20, 2019 · 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. In brief, this incredibly long period of time, measured in "mya" or "millions of years ago," saw the development of dinosaurs, marine reptiles, fish, mammals, flying animals ... The find appears to represent the smallest known dinosaur of the Mesozoic era, rivalling the bee hummingbird (Mellisuga helenae)—the smallest living bird—in size. The O. khaungraae specimen ...Oct 8, 2023 · The abundance of their fossilized bones is substantive proof that dinosaurs were the dominant form of terrestrial animal life during the Mesozoic Era (about 252.2 million to 66 million years ago). It is likely that the known remains represent a very small fraction (probably less than 0.0001 percent) of all the individual dinosaurs that once lived. Cretaceous last of the dinosaur Periods (145–66 mln years ago) Of the three dinosaur periods of the Mesozoic, the Cretaceous was undoubtedly the golden age of evolution. It was a time of massive reorganization or “upgrading” of ecosystems, both on land and marine realms. Photo Credit: Wikimedia Commons.Home Bookshelves In troduc tory and General Biology Introductory Biology (CK-12) 5: Evolution 5.10: Mesozoic Era - The Age of Dinosaurs While Idaho's Mesozoic beasts 秊練 might not be as well known nearby pl..." Idaho Museum of Natural History on Instagram: "Idaho has #dinosaurs! While Idaho's Mesozoic beasts 🦕🦖 might not be as well known nearby places such as Montana, Wyoming, or Utah, it also means the secrets of our #dinosaur friends are still being uncovered!The Mesozoic was a time when dinosaurs dominated the planet, but amphibians were still around—they just weren’t as numerous or diverse as they had been in earlier periods. The Mesozoic era began 252 million years ago and ended 66 million years ago. During this time, amphibians ranged in size from 2 inches to over 13 feet long.It's a dream come true for all young dino-fans: a CGI-animated series called Dinosaur Train brings the natural sciences, including history and paleontology, to life. Aimed at preschoolers, this new PBS Kids series, co-produced by the Jim Henson Co., includes 40 half-hour episodes featuring live-action and paleontologist Dr. Scott …Mar 20, 2017 · Meet the First True Dinosaurs of the Mesozoic Era. Tawa. Jorge Gonzalez. The first true dinosaurs --small, two-legged, meat-eating reptiles--evolved in what is now South America during the middle to late Triassic period, about 230 million years ago, and then spread around the world. On the following slides, you'll find pictures and detailed ...
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1 Ağu 2016 ... Dinosaur Periods of the Mesozoic Era. Dinosaurs were alive in the Triassic, Jurassic and Cretaceous periods. Together, these three periods ...Category for all known "Dinosaurs" within the Mesozoica video game.Home > Animals > Extinct > Dinosaurs. Photographic Print of Spinosaurus hunting in prehistoric waters. arrow_back_ios arrow_forward_ios -+ $18.99 ...Dinosaurs lived during the Mesozoic Era (252 to 66 million years ago), often called the “Age of Dinosaurs.”. The Mesozoic Era is divided into three time periods, the Triassic, Jurassic, and Cretaceous. The Utah Geological Survey recognizes the presence of over 27 sequential, non-overlapping dinosaur faunas spanning 165 million years from ...View IMG_8146.jpeg from GEOL MISC at Richland Community College. Evolution: Evidence of Change The Geologic Time Scal€ Use : the - info r mation 1 frotn - below the diagram . NMiltions of 'earsWelcome to the early cretaceious period. It's 130 million years ago in eastern Asia, and you are standing on the marshy shore of a giant lake. Fish swim by and animals from tiny mammals to large dinosaurs make their way through the forest. Among the most intriguing animals from this region are the creatures that are covered in feathers--but ...Dinosaurs & Fossils. Utah contains one of the most complete fossil records on Earth. This record spans almost 2 billion years! Some of the most common fossils are of early marine life such as mollusks (snails, clams, and ammonites), fish, and trilobites from Paleozoic-age rocks in Utah’s West Desert. Eastern Utah contains younger, Mesozoic ...Category for all known "Dinosaurs" within the Mesozoica video game.Take a thrilling dive into the ancient world of Allosaurus with this captivating and informative short! Explore the remarkable features and fearsome nature o...They visit three important time periods in the development of the Mesozoic Era: the Triassic, the Jurassic, and the Cretaceous. Along the way, Ronnie finds herself face-to-face with real-life dinosaurs and reptiles, …The intensively studied Mesozoic dinosaur record provides a model system for such investigation, representing an ecologically diverse group that dominated terrestrial ecosystems for 170 million years. Furthermore, with 10,000 species, extant dinosaurs (birds) are the most speciose living tetrapod clade.Mesozoic Evolution Figure \(\PageIndex{1}\): A Mesozoic scene from the late Jurassic. The Mesozoic era is dominated by reptiles, and more specifically, the dinosaurs. The Triassic saw devastated ecosystems that took over 30 million years to fully re-emerge after the Permian Mass Extinction . The first appearance of many modern groups of animals ... Colouring pages have been a popular activity for children for generations. They provide a fun and easy way for kids to express their creativity and develop important skills. One popular type of colouring page is the dinosaur colouring page.The Mesozoic Era is the second-to-last era of Earth's geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Periods. It is characterized by the dominance of archosaurian reptiles , such as the dinosaurs ; an abundance of gymnosperms , (such as ginkgoales , bennettitales ) and ferns ; a hot greenhouse climate ... 23 Eyl 2023 ... The Mesozoic Era (252 to 66 million years ago) ... The Mesozoic Era had a lot of “firsts”. For example, it had the first birds, first mammals, ...Take a thrilling dive into the ancient world of Allosaurus with this captivating and informative short! Explore the remarkable features and fearsome nature o...Dec 3, 2021 · hadrosaur: A duck-billed, plant-eating dinosaur that lived during the late Cretaceous Era. Jurassic: Lasting from about 200 million to 145.5 million years ago, it’s the middle period of the Mesozoic Era. This was a time when dinosaurs were the dominant form of life on land. Mar 20, 2017 · Meet the First True Dinosaurs of the Mesozoic Era. Tawa. Jorge Gonzalez. The first true dinosaurs --small, two-legged, meat-eating reptiles--evolved in what is now South America during the middle to late Triassic period, about 230 million years ago, and then spread around the world. On the following slides, you'll find pictures and detailed ... 19.2 †Archaeopteryx, Mesozoic Avialans, and the Mosaic Evolution of Avian Characters —Discovery of †Archaeopteryx —Cretaceous avialans —Mosaic evolution of some avialan characters —Other avian features —Body size 19.3 Evolution of Powered Flight —How-and why-birds got off the ground —Gliding and flying by other Mesozoic paravians.