66-496: The Mount Laurel Formation is a Mesozoic geologic formation located in New Jersey and Delaware . Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation. Dinosaur teeth recovered from this formation include tyrannosauroid teeth similar to those of Dryptosaurus , as well as teeth from a ~3-4m saurornitholestine dromaeosaurid . Other fossils include: Belemnites in
132-792: A Baptist minister, in Swindon , for a period of private study. Mantell returned to Lewes at age 15. With the help of a local Whig party leader, Mantell secured an apprenticeship with a local surgeon named James Moore. He served as an apprentice to Moore in Lewes for a period of five years, in which he took care of Mantell's dining, lodging and medical issues. Mantell's early apprenticeship duties included cleaning vials, as well as separating and arranging drugs . Soon, he learned how to make pills and other pharmaceutical products . He delivered Moore's medicines, kept his accounts, wrote out bills and extracted teeth from his patients. On 11 July 1807, Thomas Mantell died at
198-558: A Member of the Royal College of Surgeons in 1811. Four days later, he received a certificate from the Lying-in Charity for Married Women at Their Own Habitations that allowed him to act in midwifery duties. He returned to Lewes, and immediately formed a partnership with his former master, James Moore. In the wake of the cholera , typhoid and smallpox epidemics, Mantell found himself quite busy attending to more than 50 patients
264-476: A boom of dinosaurian evolution on land as the continents began to separate from each other (Nyasasaurus from 243 to 210 million years ago, approximately 235–30 ma, some of them separated into Sauropodomorphs, Theropods and Herrerasaurids), as well as the first pterosaurs . During the Late Triassic, some advanced cynodonts gave rise to the first Mammaliaformes . All this climatic change, however, resulted in
330-526: A carriage accident. He got stuck in the reins and was dragged along for 5 miles before arriving at his destination. Despite being bent, crippled and in constant pain, he continued to work with fossilised reptiles and published a number of scientific books and papers until his death in November the 10th 1852. He moved to Pimlico in 1844 and began to take opium , as a painkiller, in 1845. On 10 November 1852, Mantell took an overdose of opium and later lapsed into
396-582: A coating. This contrasts with the earth's current flora, in which the dominant land plants in terms of number of species are angiosperms . The earliest members of the genus Ginkgo first appeared during the Middle Jurassic. This genus is represented today by a single species, Ginkgo biloba . Modern conifer groups began to radiate during the Jurassic. Bennettitales , an extinct group of gymnosperms with foliage superficially resembling that of cycads gained
462-481: A coma. He died that afternoon. His post-mortem by William Adams showed that he had been suffering from severe lumbar scoliosis , leading to the Adams Forward Bend Test as a diagnostic tool. A section of Mantell's spine was removed, preserved and stored on a shelf at the Royal College of Surgeons of England. It remained there until 1969 when it was destroyed due to lack of space. Mantell's surgery, on
528-416: A day and delivering between 200 and 300 babies a year. As he later recalled, he would have to stay up for "six or seven nights in succession" due to his overwhelming doctoral duties. He was also able to increase his practice's profits from £250 to £750 a year. Although mainly occupied with running his busy country medical practice, he spent his little free time pursuing his passion, geology, often working into
594-585: A decline in diversity of sauropods, stegosaurs, and other high-browsing groups, with sauropods particularly scarce in North America. Some island-hopping dinosaurs, such as Eustreptospondylus , evolved to cope with the coastal shallows and small islands of ancient Europe. Other dinosaurs rose up to fill the empty space that the Jurassic-Cretaceous extinction left behind, such as Carcharodontosaurus and Spinosaurus . Seasons came back into effect and
660-477: A few million years before the Triassic–Jurassic extinction event. Sea levels began to rise during the Jurassic, probably caused by an increase in seafloor spreading . The formation of new crust beneath the surface displaced ocean waters by as much as 200 m (656 ft) above today's sea level, flooding coastal areas. Furthermore, Pangaea began to rift into smaller divisions, creating new shoreline around
726-477: A global distribution during the Late Triassic, and represented one of the most common groups of Mesozoic seed plants. Flowering plants radiated during the early Cretaceous, first in the tropics , but the even temperature gradient allowed them to spread toward the poles throughout the period. By the end of the Cretaceous, angiosperms dominated tree floras in many areas, although some evidence suggests that biomass
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#1733085672940792-659: A large die-out known as the Triassic–Jurassic extinction event, in which many archosaurs (excluding pterosaurs, dinosaurs and crocodylomorphs ), most synapsids , and almost all large amphibians became extinct, as well as 34% of marine life, in the Earth's fourth mass extinction event. The cause is debatable; flood basalt eruptions at the Central Atlantic magmatic province is cited as one possible cause. The Jurassic ranges from 200 million years to 145 million years ago and features three major epochs: The Early Jurassic,
858-488: A late party and apparently had some doubts when reconsidering the matter when he awoke, fresh in the morning. "The next morning he told me that he was confident that it was something quite different." Strangely, this change of opinion did not make it back to Britain where Mantell was mocked for his error. Mantell was still convinced that the teeth had come from the Mesozoic strata and finally recognised that they resembled those of
924-591: A special licence to marry Mantell. After obtaining consent and the licence, she married Mantell on 4 May at St. Marylebone Church. That year, he purchased his own medical practice and took up an appointment at the Royal Artillery Hospital, at Ringmer , Lewes. Inspired by Mary Anning 's sensational discovery of a fossilised animal resembling a huge crocodile (later identified as an ichthyosaur ) at Lyme Regis in Dorset, Mantell became passionately interested in
990-435: A variety of niches, beginning in the mid-Triassic 4 million to 6 million years after the extinction, and not fully proliferated until 30 million years after the extinction. Animal life was then dominated by various archosaurs: dinosaurs , pterosaurs, and aquatic reptiles such as ichthyosaurs, plesiosaurs, and mosasaurs . The climatic changes of the late Jurassic and Cretaceous favored further adaptive radiation. The Jurassic
1056-522: Is thought that a large meteor smashed into earth 66 million years ago, creating the Chicxulub Crater in an event known as the K-Pg Extinction (formerly K-T), the fifth and most recent mass extinction event, in which 75% of life became extinct, including all non-avian dinosaurs. Compared to the vigorous convergent plate mountain-building of the late Paleozoic, Mesozoic tectonic deformation
1122-423: Is unknown, but Mantell's response is known. Galvanised and encouraged, Mantell showed the teeth to other scientists but they were dismissed as belonging to a fish or mammal and from a more recent rock layer than the other Tilgate Forest fossils. The eminent French anatomist , Georges Cuvier , identified the teeth as those of a rhinoceros . Although according to Charles Lyell , Cuvier made this statement after
1188-664: The Cenozoic . The era began in the wake of the Permian–Triassic extinction event , the largest mass extinction in Earth's history, and ended with the Cretaceous–Paleogene extinction event , another mass extinction whose victims included the non-avian dinosaurs , pterosaurs , mosasaurs , and plesiosaurs . The Mesozoic was a time of significant tectonic, climatic, and evolutionary activity. The supercontinent Pangaea began to break apart into separate landmasses. The climate of
1254-679: The Greek prefix meso- ( μεσο- 'between') and zōon ( ζῷον 'animal, living being'). In this way, the Mesozoic is comparable to the Cenozoic ( lit. ' new life ' ) and Paleozoic ('old life') eras as well as the Proterozoic ('earlier life') Eon. The Mesozoic Era was originally described as the "secondary" era, following the "primary" ( Paleozoic ), and preceding the Tertiary . Following
1320-698: The Indian subcontinent , which collided with the Asian plate during the Cenozoic, giving rise to the Himalayas . The Triassic was generally dry, a trend that began in the late Carboniferous , and highly seasonal, especially in the interior of Pangaea. Low sea levels may have also exacerbated temperature extremes. With its high specific heat capacity , water acts as a temperature-stabilizing heat reservoir, and land areas near large bodies of water—especially oceans—experience less variation in temperature. Because much of Pangaea's land
1386-554: The Permian Period allowed for the radiation of many new lifeforms. In particular, the extinction of the large herbivorous pareiasaurs and carnivorous gorgonopsians left those ecological niches empty. Some were filled by the surviving cynodonts and dicynodonts , the latter of which subsequently became extinct. Recent research indicates that it took much longer for the reestablishment of complex ecosystems with high biodiversity, complex food webs, and specialized animals in
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#17330856729401452-506: The Triassic , Jurassic and Cretaceous Periods . It is characterized by the dominance of gymnosperms such as cycads , ginkgoaceae and araucarian conifers, and of archosaurian reptiles such as the dinosaurs ; a hot greenhouse climate; and the tectonic break-up of Pangaea . The Mesozoic is the middle of the three eras since complex life evolved : the Paleozoic , the Mesozoic, and
1518-419: The iguana , but were twenty times larger. He surmised that the owner of the remains must have been at least 60 feet (18 metres) in length. He tried in vain to convince his peers that the fossils were from Mesozoic strata, by carefully studying rock layers. William Buckland famously disputed Mantell's assertion, by claiming that the teeth were of fish. When it was proved Mantell was correct in 1825,
1584-453: The Atlantic seaway, which has grown continually larger until today. The further separation of the continents gave opportunity for the diversification of new dinosaurs. The Cretaceous is the longest period of the Mesozoic, but has only two epochs: Early and Late Cretaceous. The Early Cretaceous spans from 145 to 100 million years ago. The Early Cretaceous saw the expansion of seaways and
1650-771: The Cretaceous–Paleogene extinction event. Approximately 50% of all genera became extinct, including all of the non- avian dinosaurs. The Triassic ranges roughly from 252 million to 201 million years ago, preceding the Jurassic Period. The period is bracketed between the Permian–Triassic extinction event and the Triassic–Jurassic extinction event , two of the " big five ", and it is divided into three major epochs: Early, Middle, and Late Triassic. The Early Triassic, about 252 to 247 million years ago,
1716-537: The Jurassic, having evolved from a branch of theropod dinosaurs, then true toothless birds appeared in the Cretaceous. The first mammals also appeared during the Mesozoic, but would remain small—less than 15 kg (33 lb)—until the Cenozoic. Flowering plants appeared in the Early Cretaceous and would rapidly diversify through the end of the era, replacing conifers and other gymnosperms ( sensu lato ), such as ginkgoales , cycads and bennettitales as
1782-458: The Late Cretaceous declined for poorly understood reasons, though this might be due to tendencies of the fossil record, as their diversity seems to be much higher than previously thought. Birds became increasingly common and diversified into a variety of enantiornithe and ornithurine forms. Though mostly small, marine hesperornithes became relatively large and flightless, adapted to life in
1848-463: The Mesozoic was varied, alternating between warming and cooling periods. Overall, however, the Earth was hotter than it is today. Dinosaurs first appeared in the Mid-Triassic, and became the dominant terrestrial vertebrates in the Late Triassic or Early Jurassic, occupying this position for about 150 or 135 million years until their demise at the end of the Cretaceous. Archaic birds appeared in
1914-549: The Middle Jurassic, and the Late Jurassic. The Early Jurassic spans from 200 to 175 million years ago. The climate was tropical and much more humid than the Triassic, as a result of the large seas appearing between the land masses. In the oceans, plesiosaurs , ichthyosaurs and ammonites were abundant. On land, dinosaurs and other archosaurs staked their claim as the dominant race, with theropods such as Dilophosaurus at
1980-617: The Paleozoic, the Mesozoic extended roughly 186 million years, from 251.902 to 66 million years ago when the Cenozoic Era began. This time frame is separated into three geologic periods . From oldest to youngest: The lower boundary of the Mesozoic is set by the Permian–Triassic extinction event , during which it has been estimated that up to 90-96% of marine species became extinct although those approximations have been brought into question with some paleontologists estimating
2046-468: The Tethys Ocean. Temperatures continued to increase, then began to stabilize. Humidity also increased with the proximity of water, and deserts retreated. The climate of the Cretaceous is less certain and more widely disputed. Probably, higher levels of carbon dioxide in the atmosphere are thought to have almost eliminated the north–south temperature gradient : temperatures were about the same across
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2112-532: The actual numbers as low as 81%. It is also known as the "Great Dying" because it is considered the largest mass extinction in the Earth's history. The upper boundary of the Mesozoic is set at the Cretaceous–Paleogene extinction event (or K–Pg extinction event ), which may have been caused by an asteroid impactor that created Chicxulub Crater on the Yucatán Peninsula . Towards the Late Cretaceous, large volcanic eruptions are also believed to have contributed to
2178-657: The age of 57. He left his son some money for his future studies. As his time in apprenticeship began to wind down, he began to anticipate his medical education. He began to teach himself human anatomy , and he ultimately detailed his new-found knowledge in a volume entitled The Anatomy of the Bones, and the Circulation of Blood , which contained dozens of detailed drawings of fetal and adult skeletal features. Soon, Mantell began his formal medical education in London. He received his diploma as
2244-510: The beginnings of the breakup of Pangaea and the opening of the Tethys Ocean . Ecosystems had recovered from the Permian extinction. Algae, sponge, corals, and crustaceans all had recovered, and new aquatic reptiles evolved, such as ichthyosaurs and nothosaurs . On land, pine forests flourished, as did groups of insects such as mosquitoes and fruit flies. Reptiles began to get bigger and bigger, and
2310-431: The current level (about 21%) throughout the Mesozoic, some concluding they were lower in the Triassic and part of the Jurassic but higher in the Cretaceous, and some concluding they were higher throughout most or all of the Triassic, Jurassic and Cretaceous. The dominant land plant species of the time were gymnosperms , which are vascular, cone-bearing, non-flowering plants such as conifers that produce seeds without
2376-409: The dawn of the Mesozoic, ocean plankton communities transitioned from ones dominated by green archaeplastidans to ones dominated by endosymbiotic algae with red-algal-derived plastids. This transition is speculated to have been caused by an increasing paucity of many trace metals in the Mesozoic ocean. Gideon Mantell Gideon Algernon Mantell MRCS FRS (3 February 1790 – 10 November 1852)
2442-499: The dinosaur's forelimbs were much shorter than its hind legs, therefore proving they were not built like a mammal as claimed by Sir Richard Owen . Mantell went on to demonstrate that fossil vertebrae , which Owen had attributed to a variety of different species, all belonged to Iguanodon . He also named a new genus of dinosaur called Hylaeosaurus and as a result became an authority on prehistoric reptiles. In 1833, Mantell relocated to Brighton but his medical practice suffered. He
2508-452: The dominant group of plants. The phrase "Age of Reptiles" was introduced by the 19th century paleontologist Gideon Mantell who viewed it as dominated by diapsids such as Iguanodon , Megalosaurus , Plesiosaurus , and Pterodactylus . The current name was proposed in 1840 by the British geologist John Phillips (1800–1874). "Mesozoic" literally means 'middle life', deriving from
2574-600: The dramatic rifting of the supercontinent Pangaea, which gradually split into a northern continent, Laurasia , and a southern continent, Gondwana . This created the passive continental margin that characterizes most of the Atlantic coastline (such as along the U.S. East Coast ) today. By the end of the era, the continents had rifted into nearly their present forms, though not their present positions. Laurasia became North America and Eurasia , while Gondwana split into South America , Africa , Australia , Antarctica and
2640-459: The early hours of the morning, identifying fossil specimens he found at the marl pits in Hamsey . In 1813, Mantell began to correspond with James Sowerby . Sowerby, a naturalist and illustrator who catalogued fossil shells, received from Mantell many fossilised specimens. In appreciation for the specimens Mantell had provided, Sowerby named one of the species Ammonites mantelli . On 7 December, Mantell
2706-665: The elder Mantell was a follower of the Methodist church and the 12 free schools were reserved for children who had been brought up in the Anglican faith. As a result, Gideon was educated at a dame school in St. Mary's Lane, and learned basic reading and writing from an old woman. After the death of his teacher, Mantell was schooled by John Button, a philosophically radical Whig who shared similar political beliefs with Mantell's father. Mantell spent two years with Button, before being sent to his uncle,
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2772-695: The entrance fee. Financially destitute, Mantell offered to sell the entire collection to the British Museum in 1838 for £ 5,000, accepting the counter-offer of £4,000. He moved to Clapham Common in South London, where he continued his work as a doctor. Mary Mantell left her husband in 1839. That same year, Gideon's son Walter emigrated to New Zealand . Walter later sent his father some important fossils from New Zealand. Gideon's daughter, Hannah, died in 1840. In 1841 he began to suffer from what would eventually be diagnosed as scoliosis, possibly precipitated by
2838-467: The fern prairies, chased by many new predators such as Allosaurus . Conifer forests made up a large portion of the forests. In the oceans, plesiosaurs were quite common, and ichthyosaurs flourished. This epoch was the peak of the reptiles. The Late Jurassic spans from 163 to 145 million years ago. During this epoch, the first avialans , such as Archaeopteryx , evolved from small coelurosaurian dinosaurs. The increase in sea levels opened up
2904-460: The first crocodilians and dinosaurs evolved, which sparked competition with the large amphibians that had previously ruled the freshwater world, respectively mammal-like reptiles on land. Following the bloom of the Middle Triassic, the Late Triassic, from 237 to 201 million years ago, featured frequent heat spells and moderate precipitation (10–20 inches per year). The recent warming led to
2970-478: The food web. In the oceans, mosasaurs ruled, filling the role of the ichthyosaurs, which, after declining, had disappeared in the Cenomanian-Turonian boundary event . Though pliosaurs had gone extinct in the same event, long-necked plesiosaurs such as Elasmosaurus continued to thrive. Flowering plants, possibly appearing as far back as the Triassic, became truly dominant for the first time. Pterosaurs in
3036-432: The fossil record. The Late Cretaceous spans from 100 to 66 million years ago. The Late Cretaceous featured a cooling trend that would continue in the Cenozoic Era. Eventually, tropics were restricted to the equator and areas beyond the tropic lines experienced extreme seasonal changes in weather. Dinosaurs still thrived, as new taxa such as Tyrannosaurus , Ankylosaurus , Triceratops and hadrosaurs dominated
3102-487: The genus Belemnitella , Oysters such as Exogyra and Pycnodonte , and rare mosasaur , turtle , and plesiosaur remains. This article about a specific stratigraphic formation in the United States is a stub . You can help Misplaced Pages by expanding it . Mesozoic The Mesozoic Era is the era of Earth's geological history , lasting from about 252 to 66 million years ago , comprising
3168-576: The only question was what to call his new reptile. His original name was "Iguana-saurus" but he then received a letter from William Daniel Conybeare : "Your discovery of the analogy between the Iguana and the fossil teeth is very interesting but the name you propose will hardly do, because it is equally applicable to the recent iguana. Iguanoides or Iguanodon would be better." Mantell took this advice to heart and called his creature Iguanodon . Years later, Mantell had acquired enough fossil evidence to show that
3234-455: The open sea. Metatherians and primitive eutherian also became common and even produced large and specialised genera such as Didelphodon and Schowalteria . Still, the dominant mammals were multituberculates, cimolodonts in the north and gondwanatheres in the south. At the end of the Cretaceous, the Deccan traps and other volcanic eruptions were poisoning the atmosphere. As this continued, it
3300-400: The origin of which he could not ascertain. In 1821 Mantell planned his next book on the geology of Sussex. It was an immediate success with two hundred subscribers including King George IV at Carlton House Palace , who wrote a letter stating, "His majesty is pleased to command that his name should be placed at the head of the subscription list for four copies." How the king heard of Mantell
3366-437: The planet, and about 10° C higher than today. The circulation of oxygen to the deep ocean may also have been disrupted, preventing the decomposition of large volumes of organic matter, which was eventually deposited as " black shale ". Different studies have come to different conclusions about the amount of oxygen in the atmosphere during different parts of the Mesozoic, with some concluding oxygen levels were lower than
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#17330856729403432-641: The poles got seasonally colder, but some dinosaurs still inhabited the polar forests year round, such as Leaellynasaura and Muttaburrasaurus . The poles were too cold for crocodiles, and became the last stronghold for large amphibians such as Koolasuchus . Pterosaurs got larger as genera such as Tapejara and Ornithocheirus evolved. Mammals continued to expand their range: eutriconodonts produced fairly large, wolverine -like predators such as Repenomamus and Gobiconodon , early therians began to expand into metatherians and eutherians , and cimolodont multituberculates went on to become common in
3498-829: The remains of terrestrial and freshwater ecosystems , at a time when all the known fossil remains from Cretaceous England, hitherto, were marine in origin. He named the new strata the Strata of Tilgate Forest , after an historical wooded area and it was later shown to belong to the Lower Cretaceous . By 1820, he had started to find very large bones at Cuckfield, even larger than those discovered by William Buckland , at Stonesfield in Oxfordshire. Then, in 1822, shortly before finishing his first book ( The Fossils of South Downs ), his wife found several large teeth (although some historians contend that they were in fact discovered by himself),
3564-573: The south side of Clapham Common, is now a dental surgery. At the time of his death Mantell was credited with discovering four of the five genera of dinosaurs then known. In 2000, in commemoration of Mantell's discovery and his contribution to the science of palaeontology, the Mantell Monument was unveiled at Whiteman's Green, Cuckfield. The monument has been confirmed as the location of the Iguanodon fossils that Mantell first described in 1822. He
3630-531: The study of the fossilised animals and plants found in his area. The fossils he had collected from the region, near The Weald in Sussex, were from the chalk downlands covering the county. The chalk is part of the Upper Cretaceous System and the fossils it contains are marine in origin. But by 1819, Mantell had begun acquiring fossils from a quarry, at Whitemans Green , near Cuckfield . These included
3696-497: The top of the food chain. The first true crocodiles evolved, pushing the large amphibians to near extinction. All-in-all, archosaurs rose to rule the world. Meanwhile, the first true mammals evolved, remaining relatively small, but spreading widely; the Jurassic Castorocauda , for example, had adaptations for swimming, digging and catching fish. Fruitafossor , from the late Jurassic Period about 150 million years ago,
3762-531: Was about the size of a chipmunk, and its teeth, forelimbs and back suggest that it dug open the nests of social insects (probably termites , as ants had not yet appeared) ; Volaticotherium was able to glide for short distances, such as modern flying squirrels . The first multituberculates such as Rugosodon evolved. The Middle Jurassic spans from 175 to 163 million years ago. During this epoch, dinosaurs flourished as huge herds of sauropods, such as Brachiosaurus and Diplodocus , filled
3828-467: Was almost rendered destitute, but for the town's council, which promptly transformed his house into a museum. There he gave a series of lectures that were published in 1838 with the title The wonders of geology, or, A familiar exposition of geological phenomena: being the substance of a course of lectures delivered at Brighton . The museum in Brighton ultimately failed as a result of Mantell's habit of waiving
3894-467: Was an English obstetrician , geologist and palaeontologist . His attempts to reconstruct the structure and life of Iguanodon began the scientific study of dinosaurs: in 1822 he was responsible for the discovery (and the eventual identification) of the first fossil teeth, and later much of the skeleton, of Iguanodon . Mantell's work on the Cretaceous of southern England was also important. Mantell
3960-547: Was born in Lewes , Sussex as the fifth-born child of Thomas Mantell, a shoemaker, and Sarah Austen. He was raised in a small cottage in St. Mary's Lane with his two sisters and four brothers. As a youth, he showed a particular interest in the field of geology. He explored pits and quarries in the surrounding areas, discovering ammonites , shells of sea urchins , fish bones, coral , and worn-out remains of dead animals. The Mantell children could not study at local grammar schools because
4026-877: Was comparatively mild. The sole major Mesozoic orogeny occurred in what is now the Arctic , creating the Innuitian orogeny , the Brooks Range , the Verkhoyansk and Cherskiy Ranges in Siberia, and the Khingan Mountains in Manchuria. This orogeny was related to the opening of the Arctic Ocean and suturing of the North China and Siberian cratons to Asia. In contrast, the era featured
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#17330856729404092-523: Was distant from its shores, temperatures fluctuated greatly, and the interior probably included expansive deserts . Abundant red beds and evaporites such as halite support these conclusions, but some evidence suggests the generally dry climate of the Triassic was punctuated by episodes of increased rainfall. The most important humid episodes were the Carnian Pluvial Event and one in the Rhaetian ,
4158-533: Was dominated by deserts in the interior of the Pangaea supercontinent. The Earth had just witnessed a massive die-off in which 95% of all life became extinct, and the most common vertebrate life on land were Lystrosaurus , labyrinthodonts , and Euparkeria along with many other creatures that managed to survive the Permian extinction. Temnospondyls reached peak diversity during the early Triassic. The Middle Triassic, from 247 to 237 million years ago, featured
4224-479: Was elected as a fellow of the Linnean Society of London . Two years later, he published his first paper, on the characteristics of the fossils found in the Lewes area. In 1816, he married Mary Ann Woodhouse , the 20-year-old daughter of one of his former patients who had died three years earlier. Since she was not 21 and still technically a minor under English law, she had to obtain permission from her mother and
4290-578: Was still dominated by cycads and ferns until after the Cretaceous–Paleogene extinction. Some plant species had distributions that were markedly different from succeeding periods; for example, the Schizeales , a fern order, were skewed to the Northern Hemisphere in the Mesozoic, but are now better represented in the Southern Hemisphere. The extinction of nearly all animal species at the end of
4356-485: Was the height of archosaur diversity, and the first birds and eutherian mammals also appeared. Some have argued that insects diversified in symbiosis with angiosperms, because insect anatomy , especially the mouth parts, seems particularly well-suited for flowering plants. However, all major insect mouth parts preceded angiosperms, and insect diversification actually slowed when they arrived, so their anatomy originally must have been suited for some other purpose. At
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