when did the ordovician period start

The Ordovician period is placed between 488.3±1.7 to 443.7±1.5 million years ago.1 It is preceded by the Cambrian period and is followed by the Silurian Period as seen in Figure 1.1 Initially, only these two periods existed, until 1979 when Charles Lapworth defined the Ordovician period as a period of its own based on fossil fauna that was different from both the Cambrian and the Silurian Period. There were extensive reef complexes in the tropics. HOME/OVERVIEW. It follows the Cambrian period and is followed by the Silurian period. Scientists attribute the event to two factors: a wave of rapid cooling and an ensuing dramatic drop in sea levels. It was centered on the Sahara region in late Ordovician, about 440–460 Ma (million years ago). 11. d ə ˈ v ɪ ʃ. i. ə n,-d oʊ-,-ˈ v ɪ ʃ. ə n / or-də-VISH-ee-ən, -⁠doh-, -⁠ VISH-ən) is a geologic period and system, the second of six periods of the Paleozoic Era.The Ordovician spans 41.6 million years from the end of the Cambrian Period 485.4 million years ago (Mya) to the start of the Silurian Period 443.8 Mya.. i. ən, s aɪ-/ sih-LYOOR-ee-ən, sy-) is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at 443.8 million years ago (), to the beginning of the Devonian Period, 419.2 Mya. When did the Silurian Period occur? Ordovician Pic #2.gif. Consequently, CO2 levels only needed to fall below 3000 parts per million for glaciation to be possible. The Ordovician was named after the Welsh tribe of the Ordovices. Chapter 4 - The Ordovician Period Lesson 21: Ordovician Overview ... Ordovician Fast Facts Start: 488.3 Ma End: 443.7 Ma Duration: 44.6 Million Years Preceded by: Cambrian Period Followed by: Silurian Period: Paleoeclimatology: Mean atmospheric O 2 content over period duration: ca. Recognizing the Ordovician between the Cambrian and Silurian ended a 40 … The Ordovician, named after the Welsh tribe of the Ordovices, was … Page 212. Throughout the Ordovician, Gondwana shifted towards the South Pole and … In our simulations, atmospheric Ordovician ancestors, but is a representative and global temperature was 21.4 °C 460 Myr CO2 concentrations and temperature non-vascular plant that can be used for ago, the start of the Late Ordovician (Fig. The Ordovician-Silurian is a combination of two extinction events regarded as the second-largest mass extinction in terms of the portion of species that became extinct. This period saw … The Silurian (/ s ɪ ˈ lj ʊər. Є. O. S. D. C. P. T. J. K. Pg. At the end … However, when Gondwana finally settled on the South Pole during the Upper Ordovician, massive glaciers formed, causing shallow seas to drain and sea levels to drop. Trilobites, including Isotelus, are very common fossils found in Ohio limestone. See the illustration above, Gondwana is in the lower right hand corner. During the Ordovician, many of the landmasses were aligned in the tropics. (1 pts) 13. What happened to the atmosphere during the ordovician period? During the Ordovician Life expanded in diversity tremendously. It follows the Cambrian Period and is followed by the Silurian Period. The mass extinction timeline dates back to the end of the Ordovician period-beginning of the Silurian period. Although organisms also present in the Cambrian were … It began 443.8 million years ago and ended 419.2 million years ago, extending from the close of the Ordovician Period to the beginning of the Devonian Period. 1 History 2 Possible causes 2.1 Gamma Ray Burst Hypothesis 3 End of the event 4 See also 5 Sources 6 Further reading 7 External links The extinctions occurred approximately 444–447 million years ago and mark the boundary between … Color the scene to bring the Isotelus to life! The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period , at 443.8 million years ago (Mya), to the beginning of the Devonian Period , 419.2 Mya. Secondly, how long did the Ordovician period last? During the Devonian period, survivors from the late Ordovician extinction steadily recover. The Ordovician (/ ɔːr. … The Silurian is a time when many biologically significant events occurred. Even more severe than the Ordovician extinction was the Permian extinction, the second of … The Ordovician Period started at a major extinction event called the Cambrian–Ordovician extinction events about 485.4 ± 1.9 Mya (million years ago), and lasted for about 44.6 million years. Enter the answer length or the answer pattern to get better results. (2 pts) 17. The Ordovician Period. Ordovician Period, in geologic time, the second period of the Paleozoic Era. The Ordovician began about 490 million years ago and lasted for about 47 million years. The Ordovician (pron. Pre- vious richness curves through the Early Paleozoic show a modest increase during the earliest Cambrian, initiated by the Cambrian “Explosion,” followed … The Eurypterids or Sea Scorpions, made their first appearance in the Ordovician Period. It was the fourth period of the Paleozoic Era. Date: January 27, 2021. When did the … The Cambrian lasted 55.6 million years from the end of the preceding Ediacaran Period 541 million years ago (mya) to the beginning of the Ordovician Period mya. 416 MYA. What rock is the Devonian Reef made of? In was Period did fish fill the ocean? A global review of occurrence data of latest Ordovician benthic marine organisms reveals that virtually all warm-water … Ordovician Pic #3.jpg. The Crossword Solver found 20 answers to the geologic period/693195 crossword clue. When did the Ordovician Period occur? It was defined by Charles Lapworth in 1879. 13.5 Vol % (68 % of modern level) Mean atmospheric CO 2 content over period duration: ca. Ordovician. What is happening to in-land Australia and why? The Cambrian Period is famous for the incredible radiation of animal life that kick-started the Paleozoic Era and the entire Phanerozoic Eon. At the start of the period Gondwana was located at the equator but as the period progressed, it drifted towards the South Pole. It follows the Cambrian Period and is followed by the Silurian Period. Є. O. S. D. C. P. T. J. K. Pg. The era witnessed an ice age, which is evident from the moraines deposited by the glaciers. Silurian: 438-408 Million Years Ago, to Hattoii*th . The Ordovician Period began about 485 million years ago and ran up until about 440 million years ago. Modern relatives of trilobites include crabs, lobsters, and centipedes. The end-Ordovician mass extinction (EOME) was the first of the “Big Five” extinctions of the Phanerozoic (Raup and Sepkoski, 1982; Stanley, 2016).Since being proposed by Brenchley and Newall (1984) the EOME has traditionally been depicted as consisting of two pulses, the first linked to the onset of rapid, extensive glaciation near the Katian/Hirnantian boundary followed by … The Great Ordovician Biodiversification Event considerably increased the diversity of life. Why are many rocks in Australia red? The Ordovician Period began 488 million years ago. The Ordovician, named after the Celtic tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam … During the Ordovician, the southern continents formed a single "supercontinent" called Gondwana. Despite the tremendous expansion of life during the Ordovician Period there was a devastating mass extinction of organisms at the end of the Ordovician. The End Ordovician extinction was the first of the Big Five mass extinction events in the history of the Earth. The base of the Silurian is set at a series of major … This period was defined by Charles Lapworth in 1879 and named after a Celtic tribe called the Ordovices. It was centered on the Sahara region in late Ordovician, about 440–460 Ma (million years ago). The major glaciation during this period is widely considered to be the leading cause of the Ordovician-Silurian extinction event. Evidence of this glaciation can be seen in places such as Morocco, South Africa, Libya, and Wyoming. It lived in the warm, shallow seas that covered Ohio during the Ordovician Period. The first of those occurred 443 million years ago at the close of the Ordovician Period. Fish, the world's first true vertebrates, continued to evolve, … Ordovician Pic #3.jpg. Interval of geologic time, 490–443 million years ago, the second oldest period of the Paleozoic Era. (1 pts) 11. The major glaciation during this period is widely considered to be the leading cause of the Ordovician-Silurian extinction event. Continental drift has had an enormous impact on plate tectonics and the way the earth looks today structurally.3 During the The Ordovician followed the Cambrian period, during which new life forms grew … Species like these were abundant and ecologically … Though there is some scientific debate about what fossil strata should mark the beginning of the period, the International Geological Congress places the lower boundary of the period at According to the International Commission on Stratigraphy (Ogg, 2004), the Devonian extends from the end of the Silurian Period 419.2 ± 3.2 Mya, to the beginning of the Carboniferous Period 358.9 ± 0.4 Mya (in North America, the beginning of the Mississippian … (3 pts) 9. 1 The dates … This period witnessed the origin and rapid evolution … The Ordovician, named after the Celtic tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam … The Ordovician-Silurian extinction event was the second largest of the five major extinction events in Earth's history in terms of percentage of genera that went extinct. What caused the End Ordovician extinction? Introduction. Ordovician Period, in geologic time, the second period of the Paleozoic Era. After the Cambrian Period came the 45-million-year Ordovician Period, which is marked in the fossil record by an abundance of marine invertebrates. At the start of the period Gondwana was located at the equator but as the period progressed, it drifted towards the … The Devonian Period occurred from 416 million to 358 million years ago. The interval was a time of intense diversification (an increase in the number of species) of marine animal life in what became known as the Ordovician radiation. The Cambrian System, named by English geologist Adam Sedgwick for slaty rocks in southern Wales and southwestern England, contains the earliest record of abundant and varied life-forms. Cambrian Period, earliest time division of the Paleozoic Era and Phanerozoic Eon, lasting from 541 million to 485.4 million years ago. (2 pts) 10. The Ordovician Period started about 488.3 ± 1.7 Ma (million years ago), and lasted for about 44.6 million years. PreЄ . It follows the Cambrian Period and is followed by the Silurian Period. (488 million years ago-444 million years ago) During this period, the area in the northern … The Early Paleozoic, and notably the Ordovician Period with its dramatic fluctuations in taxonomic richness, is a particularly relevant interval of the fossil record to test whether thresholds in the physical environment affect biodiversity accumulation. The Ordovician period (500 to 440 million years ago) comes after the Cambrian in the early Paleozoic era.The period is named for a Celtic tribe named the Ordovices who once lived in the area of Wales (in Britain) where the rocks were first studied.Ordovician limestones are over 6.4 kilometers (4 miles) thick in places and are found on all continents except Antarctica.The uniformity … D uring the Silurian … Abstract Near the end of the Late Ordovician, in the first of five mass extinctions in the Phanerozoic, about 85% of marine species died. As with other geologic periods, the rock beds that define the period's start and end are well identified, but the exact dates are uncertain by several million years. 45 million years Also, what was the climate in the Silurian period? At this time, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the southern super-continent Gondwana. At this time, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the southern super-continent Gondwana. The cause was a brief glacial interval that produced two pulses of extinction. More. 5. The Ordovician period started at a minor extinction event some time about When did the Devonian period occur? After the Ordovician extinction, there were four more extinction events, the most recent one being the dinosaur extinction 65 million years ago. See the illustration above, Gondwana is in the lower right hand corner. During the Devonian period, survivors from the late Ordovician extinction steadily recover. The Ordovician Mass Extinction Fast Facts - Ordovician period (510- 438 million years ago) - Ordovician extinction (440-450 million years ago) - Ordovician extinction was second most devastating in earth history. (470 ma) Mean atmospheric O 2 content over period duration c. 13.5 vol % (68 % of modern level) Mean atmospheric CO 2 content over period duration c. 4200 ppm (15 times pre-industrial level) Mean surface … As the period nears its end, however, two new extinction pulses occur, mainly affecting marine populations. Since then, its start has been redefined as an extinction event that marks the Cambrian-Precambrian boundary. Previous richness curves through the Early Paleozoic show a modest increase during the earliest Cambrian, initiated by the Cambrian … Much of the reef-building fauna was also decimated. The Ordovician spans 41.6 million years from the end of the Cambrian Period 485.4 million years ago (Mya) to the start of the Silurian Period 443.8 Mya. It lasted from about 485.4 million years ago (mya) to 443.4 mya. * During this period, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the southern supercontinent Gondwana. Brachiopods are some of the most famous animals from the Ordovician. When the sea was out, the low coastal plains were covered with luxuriant forests of seed ferns, ferns, scale trees, calamite trees, and cordaite trees. 31.What orogenies occurred during the Ordovician and where did they occur? Start Now. The Ordovician period followed the Cambrian period which existed from 505 and 439 million years ago. In the oceans, there was a widespread radiation of crinoids, a continued proliferation and expansion of the brachiopods, and the oldest known fossils of coral reefs.The time period also marks the wide and rapid spread of jawless fish, along with the important appearances of both the first known freshwater fish … The start of the Cambrian period has traditionally been defined as the emergence of shield-shaped arthropods called trilobites and early sponges (and the first reef-builders) called archeocyathids (literally "ancient cup"). 32.What are two index fossils for the Ordovician? 3, remained low during the Late Ordovician experimentation. Insert an image as part of your answer. PARAÑAQUE SCIENCE HIGH SCHOOL FRESHMEN BATCH 22 Prepared and Presented by: Group 2 I-B Learn vocabulary, terms, and more with flashcards, games, and other study tools. It ended with the Ordovician–Silurian extinction event, about 443.4 ± 1.5 Mya (ICS, 2004) that wiped out 60% of marine genera. The Rise of The Eurypterids Cephalopods were smaller and there were fewer of them than during the Ordovician Period. Eurypterids were arthropods. Roughly 85 percent of all species living at that time were lost, including large numbers of brachiopods and trilobites. The Ordovician period was named by by Lapworth in 1879 after an ancient Celtic tribe (i.e., the Ordovices) that once inhabited the region in Wales where rock strata of this period occur. During the Late Cambrian and Early Ordovician periods, carbonate rocks, or limestones, were deposited in the warm, shallow waters of this sea. Ordovician Period By Austin Zeplowitz . The Ordovician period started at a major extinction event called the Cambrian-Ordovician extinction events some time about What did the world look like during the Ordovician? 444 MYA. Taconi Early … During the Cambrian period (542 to 490 million years ago), sandstones, dolostones, and shales were deposited on beaches and in shallow seas covering the eastern edge of North America. The Ordovician System rounded out the threefold division of early Paleozoic rocks (i.e., Cambrian, Ordovician, and Silurian), which are all named for Welsh tribes. Ordovician Period 485.4–443.8 million years ago. 1/3. When did the carboniferous period occur? The Ordovician 490 to 443 Million Years Ago. The first land plants appeared around 470 million years ago, during the Ordovician period, when life was diversifying rapidly. The Silurian Period: During the Silurian Period (440–410 million years ago), corals appeared in the … The extinction events mark the boundary between Silurian and Ordovician periods and took place during the Hirnatian Age Life of the Silurian. The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago (Mya), to the beginning of the Devonian Period, Mya. He recognized that the fossils in the disputed strata were different from those of the … The time of this event has been very precisely defined using changes in … The Ordovician ( /ɔːrdəˈvɪʃən/) is a geologic period and system, the second of six periods of the Paleozoic Era.The Ordovician spans 41.2 million years from the end of the Cambrian Period 485.4 million years ago (Mya) to the start of the Silurian Period 443.8 Mya.. 1. During the Ordovician, the southern continents formed a single “supercontinent” called Gondwana. The end-Ordovician mass extinction (EOME) is widely interpreted as consisting of two pulses associated with the onset and demise of the Gondwana glaciation, respectively, with the second pulse eradicating the distinctive, glacially related Hirnantian benthic biota (HBB). Throughout the Ordovician, Gondwana shifted towards the … It began 485.4 million years ago, following the Cambrian Period, and ended 443.8 million years ago, when the Silurian Period began. Ordovician-Silurian extinction event- occurred at the end of the period approximately 443 million years ago. 60% of marine genera went extinct. The cause of the extinction was predicted to be a gamma-ray burst. Cambrian-Ordovician extinction event- occurred at the start of the period 485 million years ago. (1 pts) 15. Ordovician Period Learn more about the time period that took place 488 to 443 million years ago. But throughout the period, the planet has wobbled on its path around the sun. The Silurian is the shortest period of the Paleozoic Era.As with other geologic periods, the rock beds that define the period's start and end are well identified, but the … The Ordovician Period: During the next period, the Ordovician Period (505–440 million years ago), the oceans became filled with invertebrates of many types. Start studying Paleozoic Era. In the Silurian they became the dominant predator. Cambrian Period, Ordovician Period, and Silurian Period. Just as a robin is a kind of bird, the Isotelus is a kind of trilobite. The Ordovician /ɔrdəˈvɪʃən/ is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 ± 1.9 to 443.4 ± 1.5 million years ago (ICS, 2004). When did the Ordovician period start and end? The Late Ordovician period, ending 444 million years ago, was marked by the onset of glaciations. The Ordovician period was started by an extinction called the Cambrian-Ordovician extinction which lasted about 44.6 million years, and ended with a mass extinction event known as the Ordovician-Silurian extinction event that wiped out approximately 60% of all the marine genera. The geological situation did not change much from the Cambrian era except for the fact that the continents did start to shift towards the coast and the continents became more flooded. : /ɔrdəˈvɪʃən/) is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 ± 1.9 to 443.4 ± 1.5 million years ago. https://www.thoughtco.com/ordovician-period-488-443-million-years-1091428 The Ordovician, named after the Celtic tribe of the Ordovices, was defined by Charles Lapworth in 1879 to resolve a dispute between followers of Adam … We don't have much in the way of direct evidence, except for a handful of fossilized scales, but the first sharks are believed to have evolved during the Ordovician period, about 420 million years ago (to put this into perspective, the first tetrapods didn't crawl up out of the sea until 400 million years ago). The Late Ordovician period, ending 444 million years ago, was marked by the onset of glaciations. : /ɔrdəˈvɪʃən/) is a geologic period and system, the second of six of the Paleozoic Era, and covers the time between 485.4 ± 1.9 to 443.4 ± 1.5 million years ago. Around 443 million years ago, at the end of the Ordovician period, a major mass extinction occurred. Ordovician Period 485.4–443.8 million years ago. Insert an image as part of your answer and give their scientific names-36. The first pulse was at the beginning of the glaciation, when sea-level decline drained epicontinental seaways, produced a harsh climate in low and mid-latitudes, and initiated active, deep … The latest CO2 data calculated from sediment cores show that CO2 levels fell sharply during the late Ordovician due to high rock weathering removing CO2 from the air. During times of heavy rainfall, thick accumulations of plant debris (peat) were deposited, which later became the coal that Kentucky is famous for. 485.4 (+/- 1.9) million years ago – 443.8 (+/- 1.5) million years ago Which of the following events occurred at the end of the Ordovician? It was preceded by the Silurian Period and followed by the Carboniferous Period. The slight shifts cause ice ages to come and go. While the rock beds that define the start and end of the Devonian period are well identified, the exact dates are uncertain. A map of the world as it appeared at the boundary between the Early and Middle Ordovician. Arthropods have an exoskeleton and jointed legs. After the Ordovician Period came the Silurian Period (443 million years ago to 416 million years ago), which saw the spread of jawless fish throughout the seas. This extinction, cited as the second most devastating extinction to marine communities in earth history, caused the disappearance of one third of all brachiopod and bryozoan families, as well as numerous groups of conodonts, trilobites, and graptolites. ROCK FROM NYS. The Ordovician Period. (1 pts) 12. The naming of the Ordovician Period is tangled with the Cambrian Period. What kind of geologic structures would you expect to see in rocks from the Ordovician if there was a lot of wind? 542 MYA. This period was originally established by Lapworth to resolve the Murchison-Sedgwick conflict over their overlapping claims for their Silurian and Cambrian systems. The Ordovician is the second period of the Paleozoic era and the Phanerozoic eon. It is the longest of the Phanerozoic eras, lasting from, and … Invertebrates, namely molluscs and arthropods, dominated the oceans. For more details, see the Related Link below. (1 pts) 16. It began 485.4 million years ago and ended 443.8 million years ago. It follows the Cambrian and precedes the Silurian. ... or could have been related to geologic changes that impacted the start or end of the glacial period. The period lasted about 44 million years. 488 MYA. Plate Tectonics The current placement of our continents is vastly different from what the continents looked like in the Ordovician period. N. Mean atmospheric O 2 content over period duration: c. 13.5 vol % [1] [2] (68 % of modern level) Mean atmospheric CO 2 content over period duration: c. 4200 ppm [3] [4] (15 times pre-industrial level) Mean surface temperature over period duration: c. 16 °C [5] [6] (2 °C above modern level) Sea level (above … When did it start and which animals were affected? Suffice it to say that a Welsh tribe—Ordovices—inspired the name of this geologic period. PreЄ. Isotelus - Ohio’s Official State Fossil 4. The Ordovician is a geologic period and system, the second of six of the Paleozoic era, and covers the time between 488.3±1.7 to 443.7±1.5 million years ago. Geological Setting The Ordovician period was an era of extensive diversification and expansion of numerous marine clades. One of the Sea … The Ordovician period began approximately 490 million years ago, with the end of the Cambrian, and ended around 444 million years ago, with the beginning of the Silurian. What kind of features indicate glacial coverage? Ordovician period.png. The Ordovician-Silurian is a combination of two extinction events regarded as the second-largest mass extinction in terms of the portion of species that became extinct. The Ordovician-Silurian Extinctions. The Ordovician System of strata was founded by Lapworth in 1879 to resolve the Murchison-Sedgwick conflict over their overlapping claims for their Silurian and Cambrian systems. Benton & Harper 1997). Eon Era Period Start* End* Quaternary 2.6 0 Cenozoic Neogene 23 2.6 Paleogene 65 23 Cretaceous 145 65 Mesozoic Jurassic 200 145 Phanerozoic Triassic 251 200 Permian 299 251 Carboniferous 359 299 Paleozoic Devonian 416 359 Silurian 444 416 Ordovician 488 444 Cambrian 542 488 Precambrian 3,850 542 *Millions of years ago (Ma) $! (1 pts) 12. According to experts, this extinction event took place in two phases that were separated by a million … 359 MYA. Frog. The Ordovician Period created abundant ocean oriented fossils, but life had yet to diversify on land. It follows the Cambrian period and is followed by the Silurian period. After the Ordovician Period came the Silurian Period (443 million years ago to 416 million years ago), which saw the spread of jawless fish throughout the seas. During what period did Reptiles start breeding on land? N. 240px. The Ordovician period began approximately 490 million years ago, with the end of the Cambrian, and ended around 443 million years ago, with the beginning of the Silurian.At this time, the area north of the tropics was almost entirely ocean, and most of the world's land was collected into the southern super-continent Gondwana.Throughout the Ordovician, … The … The following animation illustrates how much the earth has changed from the Late Precambrian Period (600 Million Years ago) through the Cretaceous Period (70 Million Years ago). Evidence of this glaciation can be seen in places such as Morocco, South Africa, Libya, and Wyoming. The Ordovician, named after the Welsh tribe of the Ordovices, was defined by Charles Lapworth in 1879, to resolve a dispute between followers of Adam Sedgwick and Roderick … Click the answer to find similar crossword clues. Charles Lapworth defined this period because the followers of two of his colleagues were disputing in which strata some rock beds in northern Wales belonged. The Ordovician Period lasted almost 45 million years, beginning 488.3 million years ago and ending 443.7 million years ago. The most important genus that has left significant fossil evidence is the difficult … During the Ordovician, solar output was much lower than current levels. Crabs, insects, and spiders are all arthropods. Life continued to flourish during the Ordovician as it did in the earlier Cambrian period, although the end of the period was marked by the Ordovician–Silurian extinction event. The Pennsylvanian Period, often called the Coal Age, was a time of alternating land and sea. But animals still remained in the water. The term actually refers to two extinction periods, which together wiped out 86% of the marine species. The First Sharks . LIFE/ENVIRONMENT. What marked the start of the mass extinction timeline? When did the ordovician period start? 29.When did the Ordovician period start and end? In was Period did fish fill the ocean? 4200 ppm (10.8 … 490 million years ago. The Ordovician extinction occurred at the end of the Ordovician period, about 440-450 million years ago. The Ordovician period began approximately 490 million years ago, with the end of the Cambrian, and ended around 443 million years ago, with the beginning of the Silurian. The Ordovician Period lasted almost 45 million years, beginning 488.3 million years ago and ending 443.7 million years ago. The extinction events mark the boundary between Silurian and Ordovician periods and took place during the Hirnatian Age (approximately 445 to 443 million years ago) of the Ordovician … How many mass extinction events were there and how did they affect our planet? The Cambrian period is a geologic period that extends from 542 to 488 million years ago. When … Ordovician Period. When did the Cambrian period occur? 30. For many decades, it was famous for being thought of as the first geologic period to contain multicellular life. Also during this period, the first fish evolved and plants colonized the land for the first time. What is the mineral in these red rocks?

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