Five geological systems/epochs (Prenectarian, Nectarian, Imbria, Eratostenian, Copernicus), and Imbria divided into two series/epochs (early and late), defined ...The current era on the geologic time scale is the Cenozoic Era. The era began after the K-T extinction resulted in the end of the Mesozoic Era around 65 million years ago. The extinction of the dinosaurs gave mammals the chance to prolifera...Online exhibits: Geologic time scale: Cenozoic Era. The Pliocene Epoch. The picture below shows a modern herd of zebra grazing on an African savanna. Grazing mammals, such as the perissodactyls and artiodactyls diversified in the Miocene and Pliocene as grasslands and savanna spread across most continents.The geologic time scale conceptually consists of periods that we break down into smaller epochs. Epochs. Epochs are then divided into ages, which are the shortest division of geologic time. In terms of the number of geochronological units, there are 99 defined which can stretch over millions of years. Epochs contain minor differences …The geologic time scale puts the 4.6 billion years of earth's history into order. The divisions within this time scale are not of equal length, nor are they divided based on lengths of time ...Online exhibits: Geologic time scale: Paleozoic Era. The Ordovician Period. The Ordovician Period lasted almost 45 million years, beginning 488.3 million years ago and ending 443.7 million years ago.* 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 ...The Pliocene (/ ˈ p l aɪ. ə s iː n, ˈ p l aɪ. oʊ-/ PLY-ə-seen, PLY-oh-; also Pleiocene) is the epoch in the geologic time scale that extends from 5.333 million to 2.58 million years ago. It is the second and most recent epoch of the Neogene Period in the Cenozoic Era.The Pliocene follows the Miocene Epoch and is followed by the Pleistocene Epoch. Prior to …The Epoch Times is an independent newspaper founded in 2000 by Chinese-American citizens. It has become one of the most widely read publications in the world, with a presence in over 35 countries and territories.Geological Time Scale 1. Introduction Geological time scale is a system of organizing the earth’s history into natural eras, periods and epochs (Mai et al., 2005). According to the geological time scale the estimated age of the earth is about 4.6 billion years. The geologic time was measured from the information collected by geologists from rocktime scale be periodically updated. Therefore, the Divisions of Geologic Time is dynamic and is modified as needed to include accepted changes of unit names and boundary age estimates. This fact sheet updates the Divisions of Geologic Time released in two previous USGS fact sheets (U.S. Geological Survey Geologic Names Committee, 2007, 2010). The US Geological Survey says the epicenter is in the Pacific Ocean, about 300 km from the nearest large town Kodiak, which has a population of a little more than 6,000 people. Just after midnight local time, an earthquake of magnitude 7.9 ...The primary objective of the International Commission on Stratigraphy (ICS) is to precisely define global units (systems, series, and stages) of the International Chronostratigraphic …Epoch, unit of geological time during which a rock series is deposited. It is a subdivision of a geological period, and the word is capitalized when employed in a formal sense (e.g., Pleistocene Epoch). Additional distinctions can be made by appending relative time terms, such as early, middle, and time scale be periodically updated. Therefore, the Divisions of Geologic Time is dynamic and is modified as needed to include accepted changes of unit names and boundary age estimates. This fact sheet updates the Divisions of Geologic Time released in two previous USGS fact sheets (U.S. Geological Survey Geologic Names Committee, 2007, 2010).How has the geological time scale evolved over time? It has taken hundreds of years to create and evolve the geological time scale as we know it today. The roots of its origin go back to the 1500s and 1600s, …... epoch (beginning approximately over 10,000 years ago). Credit: Lian Zhen/Xinhua/Alamy Live News. Geologic time scale Stock Photo. RM EX6PCA–Geologic time scale.geological time: the period beginning with the formation of the earth and ending in the present day. It is often tabulated beginning with the Cambrian period, since the majority of fossil forms date from then. Precambrian time began with the formation of the earth about 4,600 million years ago. Dating of rocks is usually carried out by the ...Geologic Time Scale "The history of the Earth is broken up into a hierarchical set of divisions for describing geologic time. As increasingly smaller units of time, the generally accepted divisions are Eon, Era, Period, Epoch, and Age. In the time scale shown below, two levels of this hierarchy are represented."The conventional geologic time scale is a reference system defined by a contiguous sequence of time intervals, each identified with a name. These are recursively subdivided, resulting in a hierarchy composed of intervals of various ranks. The units in the scale are ordered, so the relative temporal positions of geologic objects and events may ...During the Pleistocene Epoch of the geologic time scale, which began about a million or more years ago, mountain glaciers formed on all continents, the icecaps of Antarctica and Greenland were more extensive and thicker than today, and vast glaciers, in places as much as several thousand f. Authors . Louis L. Ray. January 1, 1977 Geologic time: The age …Supereon Eonothem / Eon Erathem / Era System / Period Series / Epoch Stage / Age ... Geological Timescale (2020) for its data. The work to develop this was ...time scale be periodically updated. Therefore, the Divisions of Geologic Time is dynamic and is modified as needed to include accepted changes of unit names and boundary age estimates. This fact sheet updates the Divisions of Geologic Time released in two previous USGS fact sheets (U.S. Geological Survey Geologic Names Committee, 2007, 2010).Most geologic time concepts (e.g., Epoch) are time intervals. In the recent knowledge graph of the international geologic time scale (Cox, 2020), the temporal topology has been incorporated. In our knowledge graph for the regional geologic time standards, we have incorporated the temporal topology in two ways: (1) directing adding …7.4.5 Geologic Time Scale. Geologic time on Earth, is represented circularly, to show the individual time divisions and important events. Ga=billion years ago, Ma=million years ago. Geologic time has been subdivided into a series of divisions by geologists. Eon is the largest division of time, followed by era, period, epoch, and age.Geological periods in order of their decreasing duration divide the geologic time into certain units of time scale which are - Eons, Eras, Periods, Epochs, and Ages. Eons are divided into Eras which are further subdivided into geological Periods, Epochs, and Ages. The calendar of Earth’s geologic history is currently divided into four eons ...May 2, 2018 · Geologic time scales divide geologic time into eons; eons into eras; and eras into periods, epochs and ages. Photograph: Mark Carnall This video contains discussion and description of the different eras and periods in the Geologic Time Scale.Recommended For You Eocene Epoch ... The “2012 Geologic Time Scale” dates it from 541.0 ± 1.0 to ~635 Ma. In this period the Ediacaran fauna appeared. – Cryogenian: The middle period in the Neoproterozoic Era: ~635-850 Ma. – Tonian: the earliest period of the Neoproterozoic Era: 850-1000 Ma. – Mesoproterozoic: the middle …7.4.5 Geologic Time Scale. Geologic time on Earth, is represented circularly, to show the individual time divisions and important events. Ga=billion years ago, Ma=million years ago. Geologic time has been subdivided into a series of divisions by geologists. Eon is the largest division of time, followed by era, period, epoch, and age.Time scale(s) used: ICS Time Scale: Definition; Chronological unit: Epoch: Stratigraphic unit: Series: Time span formality: Formal: Lower boundary definition: End of the Younger Dryas stadial. Lower boundary GSSP: NGRIP2 ice core, Greenland: Lower GSSP ratified: 2008: Upper boundary definition: Present day: Upper boundary GSSP: N/A N/A: Upper …The Permian is a geologic period and system which extends from 298.9 ± 0.2 to 252.2 ± 0.5 (Million years ago). It is the last period of the Paleozoic Era, following the Carboniferous Period and preceding the Triassic Period of the Mesozoic Era. The concept of the Permian was introduced in 1841 by geologist Sir Roderick Murchison, who named it ...In the reference text "The Geologic Time Scale 2012", Crutzen and colleagues lay out three main options for the start of the Anthropocene. It's possible to set the boundary in the early part of ...organism from the geologic past that has been preserved in sediment or rock. Without fossils, scientists may not have concluded that the earth has a history that long precedes mankind. The Geologic Time Scale is divided by the following divisions: Standard 8-2.4: Recognize the relationship among the units—era, epoch, and period—into which ...The species, including birds, mussels and a bat, have been moved off the threatened and endangered list. They join 650 other species that have gone extinct in the U.S.The Pleistocene (/ ˈ p l aɪ s t ə ˌ s iː n,-s t oʊ-/ PLY-stə-seen, -stoh-; often referred to colloquially as the Ice Age) is the geological epoch that lasted from c. 2.58 million to 11,700 years ago, spanning the Earth's most …Oct 26, 2020 · The National Park System contains a magnificent record of geologic time because rocks from each period of the geologic time scale are preserved in park landscapes. No single park has rocks from every geologic period, though some come close. Geologic Time. With the help of clocks, calendars, and appointment books, we organize our lives around time. January 1 12 am: Earth forms from the planetary nebula - 4600 million years ago. February 25, 12:30 pm: The origin of life; the first cells - 3900 million years ago. March 4, 3:39 pm: Oldest dated rocks - 3800 million years ago. March 20, 1:33 pm: First stromatolite fossils - 3600 million years ago. July 17, 9:54 pm: first fossil ...Buy now, pay later services — which let consumers finance the purchase of goods online by paying back the total in installments over time — have been growing in ubiquity this past year. Today, Scalapay, one of the companies that’s building ...May 2, 2018 · Like the periodic table, the Geologic time scale is one of those amazing human endeavours to turn a vast amount of evidence from astronomy, rocks, fossils, history and politics into a nifty little ... Quiet Time Can Just Tease People Particularly Men Dodging Spouses Ordering Chores (Reverse). To memorize the Epochs of Cenozoic Era: Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, Holocene (or Recent): Pretty Eager Old Men Play Poker Hard. Pigeon Egg Omelets Make People Puke Heartily. Put Eggs On My Plate Please Homer.Mar 19, 2022 · A closer look at the geologic time scale shows that we are in the Phanerozoic eon, the Cenozoic era, the Quaternary period, and the Holocene epoch. In this close-up view, the Cenozoic has been ... May 2, 2018 · Like the periodic table, the Geologic time scale is one of those amazing human endeavours to turn a vast amount of evidence from astronomy, rocks, fossils, history and politics into a nifty little ... 15 Agu 2014 ... Is the geology of the earth changing rapidly or is it that life is changing rapidly (in a geologic timescale)? I can understand how complex life ...Histoire de la Terre cartographiée en 24 heures, avec le découpage des 4 éons.. Une échelle des temps géologiques est un système de classement chronologique …geologic time scale v. 6.0 cenozoic mesozoic paleozoic precambrian age epoch age picks magnetic period hist. chro n. polarity quater-nary pleistocene* holocene* calabrian gelasian c1 c2 c2a c3 c3a c4 c4a c5 c5a c6 c6a c6b c6c c7 c5b c5c c5d c5e c8 c9 c10 c7a c11 c12 c13 c15 c16 c17 c18 c19 c20 c21 c22 c23 c24 c25 c26 c27 c28 c29 c30 0.012 1.8 3 ...In the reference text "The Geologic Time Scale 2012", Crutzen and colleagues lay out three main options for the start of the Anthropocene. It's possible to set the boundary in the early part of ...The Epoch Times is a widely recognized newspaper that has gained significant influence within Chinese communities worldwide. With its unique approach to news reporting and commitment to uncovering the truth, it has become a trusted source o...The Holocene is a geologic epoch that follows directly after the Pleistocene. Continental motions due to plate tectonics are less than a kilometre over a span of only 10,000 years. However, ice melt caused world sea levels to rise about 35 m (115 ft) in the early part of the Holocene and another 30 m in the later part of the Holocene.Supereon Eonothem / Eon Erathem / Era System / Period Series / Epoch Stage / Age ... Geological Timescale (2020) for its data. The work to develop this was ...Organization. In the geologic time scale, the youngest ages are on the top and the oldest on the bottom. The time scale is based upon relative times, therefore there aren’t any specific times listed with each era. The timescale is divided into eons, each eon into eras, each era into periods, and each period into epochs.The Mississippian ( / ˌmɪsɪˈsɪpi.ən / miss-ə-SIP-ee-ən, [5] also known as Lower Carboniferous or Early Carboniferous) is a subperiod in the geologic timescale or a subsystem of the geologic record. It is the earlier of two subperiods of the Carboniferous period lasting from roughly 358.9 to 323.2 million years ago.Because the time span of Earth's past is so great, geologists use the geologic time scale to show Earth's History. The geologic time scale is a record of t… Fresh features from the #1 AI-enhanced learning platform. Explore the lineup. Fresh features from the #1 AI-enhanced learning platform Crush your year with the magic of personalized studying. …Jan 1, 2020 · It is dated on the GICC05 time scale to 8236 yr b2k (8186 cal. year BP) and is the primary marker for the Early–Middle Holocene (Greenlandian–Northgrippian) boundary (after Walker et al., 2008, Walker et al., 2009). (B) Location of the NGRIP1 ice core in north–central Greenland (NGRIP1 and NGRIP2 were drilled at the same site, with NGRIP ... 5 Jan 2016 ... We are currently in the Phanerozoic Eon, the Cenozoic Era, the Quaternary Period, and Holocene epoch. http://www.sherpaguides.com/georgia/coast/ ...The Earth is about 4.567 billion (4,567 million) years old. The geological or deep time of Earth's past has been organized into various units. Boundaries on the time scale are usually marked by major geological or palaeontological events, such as mass extinctions.Geologic Time Scale: Pleistocene Epoch. (2,580,000 to 11,700 years ago) The Pleistocene Epoch is often referred to as the Ice Age due to it spanning the Earth’s most recent period of repeated glaciations. Charles Lyell introduced the term “Pleistocene” in 1839 to describe starta (layers) in Sicily that had at least 70% of their molluscan ...Geologic Time Scale: Holocene Epoch. (11,650 years before the present to today) The word Holocene is formed from two words in Ancient Greek “Holos” meaning “whole” and “Cene” meaning “new”/”recent” generally translating to “this epoch is “entirely new”. The Holocene Epoch has been identified with the current warm ...Geologic Time Scale: Pleistocene Epoch. (2,580,000 to 11,700 years ago) The Pleistocene Epoch is often referred to as the Ice Age due to it spanning the Earth’s most recent period of repeated glaciations. Charles Lyell introduced the term “Pleistocene” in 1839 to describe starta (layers) in Sicily that had at least 70% of their molluscan ...Divisions of the geologic time scale depend on events in the history of life on Earth. 13 . Divisions of Time EON – largest division of geologic time ERA nd– 2 largest, includes two or more periods PERIOD – 3rd largest, unit into which eras are divided EPOCH th– 4 largest, the subdivision of a period EON > ERA > PERIOD > EPOCH 14 . EONS Hadean …May 26, 2021 · The geologic time scale is a means of measuring time based on layers of rock that formed during specific times in Earth’s history and the fossils present in each layer. The main units of the geologic time scale, from largest (longest) to smallest, are: eon, era, period, epoch and age. Each corresponds to the time in which a particular layer ... Image Credit: Ray Troll’s creative approach on displaying geologic time is not only super cool, but inspiring. 5-The first geologic time scale that included absolute dates was published in 1913 by the British geologist Arthur Holmes. 6-Geologists have divided Earth's history into a series of time intervals. These time intervals are not equal ...Tertiary Period. Tertiary Period - Rocks, Fossils, Climate: Classically, the Cenozoic Era was divided into the Tertiary and Quaternary periods, separated at the boundary between the Pliocene and Pleistocene epochs (formerly set at 1.8 million years ago); however, by the late 20th century many authorities considered the terms Tertiary and ...The species, including birds, mussels and a bat, have been moved off the threatened and endangered list. They join 650 other species that have gone extinct in the U.S.The species, including birds, mussels and a bat, have been moved off the threatened and endangered list. They join 650 other species that have gone extinct in the U.S.The Geologic Time Scale (GTS) is the framework for deciphering and understanding the history of our planet. The steady increase in data, development of better methods and new procedures for actual dating and scaling of the rocks on Earth, and a refined relative scale with more defined units are stimulating the need for a comprehensive review of the GTS.Lower Jurassic, early Devonian times, Triassic-period rocks, Niagara epoch, Cenozoic era ... Scale 2012, by Gradstein, Ogg, Schmitz, and Ogg, Cambridge ...Geologic Time Scale: Holocene Epoch. (11,650 years before the present to today) The word Holocene is formed from two words in Ancient Greek “Holos” meaning “whole” and “Cene” meaning “new”/”recent” generally translating to “this epoch is “entirely new”. The Holocene Epoch has been identified with the current warm ...Tertiary Period. Tertiary Period - Rocks, Fossils, Climate: Classically, the Cenozoic Era was divided into the Tertiary and Quaternary periods, separated at the boundary between the Pliocene and Pleistocene epochs (formerly set at 1.8 million years ago); however, by the late 20th century many authorities considered the terms Tertiary and ...Write the approximate age ranges out next to the Epochs and Periods Eon Era Period Epoch Quaternary Pliocene Paleocene Jurassic Silurian. student submitted ...11 Jul 2023 ... ... scale of geologic time. Its onset would be in the mid-20th century, in the 1950s, according to the global signals recorded in sediments ...The Geologic Time Scale is divided into four eons, ten eras, 22 periods, and several epochs and ages. Each eon, era, period, and epoch is defined by major geological or paleontological events. The eons are the Hadean, Archean, Proterozoic, and Phanerozoic. The Phanerozoic Eon is the eon of visible life, and is divided into three eras: the ...How has the geological time scale evolved over time? It has taken hundreds of years to create and evolve the geological time scale as we know it today. The roots of its origin go back to the 1500s and 1600s, …Several geological timescales exist, reflecting the use of differing datasets and methods of interpretation. The BGS Geological Timechart is based on The Geologic Time Scale 2012 (Gradstein et el., 2012), with additions. The result is a composite geological timechart that will be updated as improved timescales become available.Eocene Epoch. April 29, 2014. Subdivision of the Paleogene Period according to the ICS, as of January 2013. The Eocene epoch, lasting from 56 to 33.9 million years ago, is a major division of the geologic timescale and the second epoch of the Paleogene Period in the Cenozoic Era. The Eocene spans the time from the end of the Palaeocene Epoch to ...A geologic epoch is the fourth largest unit of time for the geologic time scale (Figure 1). Geologic epochs are also referred to as "series" (the chronostratigraphic name) or simply "epochs". Epochs tend to be 13 to 35 million of years in length. Epochs are subsections of longer periods and consist of groups of shorter ages.Epoch names are often "Upper", …The geologic time scale is a system used to organize and categorize Earth's history. It is divided into four main groups: Eon, Era, Period, and Epoch. These divisions are arranged in a hierarchical order, with the largest unit being the Eon, followed by the Era, then the Period, and finally the Epoch. This sequence allows scientists to study ...The primary objective of the International Commission on Stratigraphy (ICS) is to precisely define global units (systems, series, and stages) of the International Chronostratigraphic Chart that, in turn, are the basis for the units (periods, epochs, and age) of the International Geologic Time Scale What is epoch in geologic time scale? epoch, unit of geological time during which a rock series is deposited. It is a subdivision of a geological period, and the word is capitalized when employed in a formal sense (e.g., Pleistocene Epoch). Additional distinctions can be made by appending relative time terms, such as early, middle, and …Online exhibits: Geologic time scale: Paleozoic Era. The Permian Period. The Permian period lasted from 299 to 251 million years ago* and was the last period of the Paleozoic Era.The distinction between the Paleozoic and the Mesozoic is made at the end of the Permian in recognition of the largest mass extinction recorded in the history of life on Earth.Feb 10, 2021 - This Pin was discovered by Samantha Ruckman. Discover (and save!) your own Pins on Pinterest.Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago). The Holocene is a geologic epoch that follows directly after the Pleistocene. Continental motions due to plate tectonics are less than a kilometre over a span of only 10,000 years. However, ice melt caused world sea levels to rise about 35 m (115 ft) in the early part of the Holocene and another 30 m in the later part of the Holocene.At GSA you'll find the resources, confidence, and connections you need to reach fulfilling new heights in your geoscience career.31 Des 2019 ... Figure 1. Approximate position of the Anthropocene within the Quaternary time scale (the chronostratigraphical basis follows the latest ...
Dec 17, 2022 · Our current geologic epoch, the Holocene, began 11,700 years ago with the end of the last big ice age. ... The geologic time scale divides Earth’s 4.6 billion-year story into grandly named ... . Phog scout
geologic time scale v. 6.0 cenozoic mesozoic paleozoic precambrian age epoch age picks magnetic period hist. chro n. polarity quater-nary pleistocene* holocene* calabrian gelasian c1 c2 c2a c3 c3a c4 c4a c5 c5a c6 c6a c6b c6c c7 c5b c5c c5d c5e c8 c9 c10 c7a c11 c12 c13 c15 c16 c17 c18 c19 c20 c21 c22 c23 c24 c25 c26 c27 c28 c29 c30 0.012 1.8 3 ...In the time scale of Lutgens & Tarbuck, the Neogene Period and the Paleogene Period below are combined and called the Tertiary Period. Calling this span from roughly 66 Myr to 1.8 Myr the Tertiary Period is fairly common in geologic literature. It is sometimes referred to as the "age of mammals".The geological time scale provides a global summary of countless small-scale temporal correlations of rock layers made at local and regional scales. ... new, youngest epoch should be added to the Quaternary: the Anthropocene. There is still considerable discussion in the geological community about whether this epoch should be added, as well as ...time scale be periodically updated. Therefore, the Divisions of Geologic Time is dynamic and is modified as needed to include accepted changes of unit names and boundary age estimates. This fact sheet updates the Divisions of Geologic Time released in two previous USGS fact sheets (U.S. Geological Survey Geologic Names Committee, 2007, 2010).Mar 22, 2022 · The geologic time scale provides geologists across the world with a shared reference of time. You might say that the geologic time scale is to geoscientists what the periodic table of elements is to chemists. The geologic time scale is divided into (from longest to shortest): eons, eras, periods, epochs and ages. The update to the geologic time scale adds three new ages, subdividing the current Holocene epoch for the first time, into the: Greenlandian (Early Holocene) Age, which began when a sudden warming ...Oct 19, 2023 · Officially, the current epoch is called the Holocene, which began 11,700 years ago after the last major ice age. However, the Anthropocene Epoch is an unofficial unit of geologic time, used to describe the most recent period in Earth’s history when human activity started to have a significant impact on the planet’s climate and ecosystems. In today’s fast-paced digital world, it can be challenging to find reliable sources of news and information. With the rise of fake news and biased reporting, it is crucial to turn to trusted outlets for accurate and unbiased reporting.Geologic Time Scale. Today, the geologic time scale is divided into major chunks of time called eons. Eons may be further divided into smaller chunks called eras, and each era is divided into periods. Figure 12.1 shows you what the geologic time scale looks like. We now live in the Phanerozoic eon, the Cenozoic era, and the Quarternary period.Likewise, geologists created the geologic time scale to organize Earth’s history into eons, eras, periods, and epochs. While a human life spans decades, geologic time spans all of Earth’s history—4,600 million years! Geologists used fundamental concepts to understand the chronological order of rocks around the world. It wasn’t until …Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago).Geologic Time Scale: Holocene Epoch. (11,650 years before the present to today) The word Holocene is formed from two words in Ancient Greek “Holos” meaning “whole” and “Cene” meaning “new”/”recent” generally translating to “this epoch is “entirely new”. The Holocene Epoch has been identified with the current warm ...The system many scientists have settled on is the International Geologic Time Scale ... The Holocene epoch began about 12,000 years ago when Earth began warming after the last ice age. But ...The geologic time scale or geological time scale ( GTS) is a representation of time based on the rock record of Earth. It is a system of chronological dating that uses chronostratigraphy (the process of relating strata to time) and geochronology (a scientific branch of geology that aims to determine the age of rocks).Apr 15, 2014 · In the geologic timescale, the Cretaceous follows the Jurassic period and is followed by the Paleogene period of the Cenozoic era. It is the last period of the Mesozoic Era, and, spanning 79 million years, the longest period of the Phanerozoic Eon. The Cretaceous was a period with a relatively warm climate, resulting in high eustatic sea levels ... January 1 12 am: Earth forms from the planetary nebula – 4600 million years ago. February 25, 12:30 pm: The origin of life; the first cells – 3900 million years ago. March 4, 3:39 pm: Oldest dated rocks – 3800 million years ago. March 20, 1:33 pm: First stromatolite fossils – 3600 million years ago. July 17, 9:54 pm: first fossil ....
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