{"id":5992,"date":"2020-08-04T10:45:00","date_gmt":"2020-08-04T10:45:00","guid":{"rendered":"https:\/\/aviancetechnologies.com\/blog\/blog\/how-do-scientists-determine-the-ages-of-human-ancestors-fossilized-dinosaurs-and-other-organisms\/"},"modified":"2020-08-04T10:45:00","modified_gmt":"2020-08-04T10:45:00","slug":"how-do-scientists-determine-the-ages-of-human-ancestors-fossilized-dinosaurs-and-other-organisms","status":"publish","type":"post","link":"https:\/\/aviancetechnologies.com\/blog\/how-do-scientists-determine-the-ages-of-human-ancestors-fossilized-dinosaurs-and-other-organisms\/","title":{"rendered":"How Do Scientists Determine the Ages of Human Ancestors, Fossilized Dinosaurs and Other Organisms?"},"content":{"rendered":"

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[responsivevoice_button rate=”1\u2033 pitch=”1.2\u2033 volume=”0.8\u2033 voice=”US English Female” buttontext=”Story in Audio”]<\/p>\n

How Do Scientists Determine the Ages of Human Ancestors, Fossilized Dinosaurs and Other Organisms?<\/h2>\n

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On the Atlantic coast of the U.S., archaeologists found oyster shells left by Native Americans more than 4,000 years ago. In Morocco, paleontologists excavated the fossils of a dinosaur that roamed Earth 168 million years ago. How did the researchers determine these ages? When examining remnants from the past, experts use radiometric dating, a versatile technique that involves counting radioactive atoms of certain elements that are still present in a sample. The particular elements studied, as well as the details of the process, depend on the approximate age of the object that scientists hope to date.<\/p>\n

For human or animal remains and artifacts from the past 50,000 years or so, researchers look at levels of carbon 14 in the sample. Also called \u201cradiocarbon,\u201d this isotope is generated by cosmic rays colliding with nitrogen in Earth\u2019s atmosphere, says Jos\u00e9 Capriles, an archaeologist at Pennsylvania State University. Chemically, carbon 14 behaves exactly like its stable siblings (carbon 12 and carbon 13), allowing plants to absorb it during photosynthesis and then pass it up the food chain. While alive, animals and plants tend to contain the same levels of carbon 14 as their environment. But \u201cas living organisms die, they stop consuming or incorporating radiocarbon,\u201d Capriles says, and \u201cthe process of radioactivity kicks in,\u201d with the isotope decaying back into nitrogen. So researchers compare the amount of carbon 14 with the levels of carbon 12 and carbon 13 to determine how much time has passed since an organism perished.<\/p>\n

The amount of carbon 14 in a dead organism decays exponentially, falling to one half of its initial value after about 5,730 years. Using an accelerator mass spectrometer, researchers can readily measure the radiocarbon in a sample. The trickier task is estimating how much of it should have been present in the environment when the organism was alive, which can then serve as a baseline for comparison.<\/p>\n

\u201cSolar flaring and other events can influence how much radiocarbon is in the upper atmosphere,\u201d Capriles says. \u201cAnd there\u2019s also [a] somewhat different distribution of radiocarbon over the entire world.\u201d Based on measurements from tree rings, ice cores and other sources, researchers have devised calibration curves that show how the concentration of carbon 14 in the environment has changed over time. The Northern Hemisphere, Southern Hemisphere and marine environments all have separate calibration curves, Capriles says. To achieve the most precise dating, he and other archaeologists also consider factors that cause local variations in atmospheric radiocarbon.<\/p>\n

Capriles studies the earliest occupants of South America, who arrived from the north and began dispersing throughout the continent around 15,000 years ago. At each archaeological site, he and his colleagues \u201cjust want to know when people were there,\u201d he says. \u201cHow long did they stay there? What was their intensity of occupation?\u201d To reconstruct a site\u2019s time line, Capriles adds, \u201cthere’s no better method out there than to use radiocarbon dating\u201d on bones, cloth, seeds and any other organic material he finds. But at sites older than about 50,000 years, almost all of the carbon 14 in a dead organism has already decayed, so researchers must turn to longer-lived elements.<\/p>\n

Originating in Earth\u2019s mantle, some radioactive elements reach the surface through volcanic processes and become trapped inside mineral crystals in soil and rock. Over the course of millions of years, uranium 235 and uranium 238, for example, undergo multistep decays to isotopes of lead, making them ideal for paleontology: researchers can determine the age of a sample by measuring the ratio of lead to uranium isotopes. But using this technique to date fossils from creatures that lived millions of years ago, such as dinosaurs, is far from straightforward. \u201cFossils themselves usually can\u2019t be dated directly,\u201d says Sarah Gibson, a paleontologist at St. Cloud State University, who studies fish evolution about 230 million to 150 million years ago, during the early Mesozoic era.<\/p>\n

Fossils form through various processes, the most common of which is called permineralization. When a deceased organism is buried, permineralization can preserve its hard parts, such as bones. As water seeps into the remains, the minerals in the water fill the gaps in the bones, solidifying into a crystalline structure that eventually replaces the organic material. By the time minerals form a fossil, they are no longer \u201cfresh\u201d\u2014the uranium inside has already been decaying for millions of years. Attempting to date one directly would yield a false result\u2014much older than the organism itself. As a result, scientists must \u201crely on the geologic formations that are around or adjacent to the fossils\u201d to calculate their age, Gibson explains. Because fossils are usually found in sedimentary rock layers, paleontologists can date them by examining the minerals above or below the sedimentary rock.<\/p>\n

Zircon, a mineral commonly found in igneous rocks, proves particularly useful. As zircon forms in cooling magma, its crystal structure contains uranium but no lead. Thus, any lead present in a sample of zircon must have formed via radioactive decay of uranium. This feature allows geologists to date volcanic ash flows that are interspersed with layers of sedimentary rock like a prehistoric layer cake. Any fossils found in the sedimentary rock must be younger than the ash below and older than the ash above.<\/p>\n

So far, so good. But what if there is no ash layer close to the fossils? \u201cIt\u2019s not always cut-and-dried,\u201d Gibson says. \u201cAt the fossil sites that I\u2019ve worked on in Utah, we have to trace the [rock] beds from Arizona [that have already been dated] northward and try to correlate [them] to different geologic formations [in Utah]. And then we can get an estimate for how old or young something is, based on the relative position.\u201d The approach is much like tracing one layer of a birthday cake around to the opposite side of the cake. In other cases, researchers can date fossilized remains using nearby \u201cindex fossils\u201d of species known to have existed during a specific narrow time frame. Yet another technique, magnetostratigraphy, studies the magnetic signatures left in rocks by Earth\u2019s magnetic field as its orientation slowly shifts.<\/p>\n

To understand how fish anatomy changed over time, Gibson depends on the results of uranium-lead dating, magnetostratigraphy and index fossils. Because of the difficulties in determining the age of rock layers, however, she does not perform radiometric dating herself. \u201cYou can\u2019t specialize in everything. That’s why you get the colleagues that can do that kind of work,\u201d she says. \u201cI really do rely on the work of other geologists and chemists to figure out these specific dates.\u201d<\/p>\n

The accuracy and precision of both radiocarbon dating and uranium-lead dating have improved in recent decades as scientists have learned more about Earth\u2019s past. In fact, researchers released a major update of the radiocarbon calibration curves this year. From the first animals to the rise of human civilization, \u201cwe\u2019re all working together, building upon each other\u2019s studies to piece [together] this snapshot of time,\u201d Gibson says.<\/p>\n<\/div>\n

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Disclaimer: Content may be edited for style and length.\u00a0Story Source<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

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