Rock dating age of earth

Dating Rocks and Fossils Using Geologic Methods

Dating Rocks and Fossils Using Geologic Methods

Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4. Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

These changes typically occur so slowly that they are barely detectable over rock dating age of earth span of a human life, yet even at this instant, the Earth's surface is moving and changing. As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils. A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved. However, by itself a fossil has little meaning unless it is placed within some context.

The age of the fossil must be determined so it can be compared to other fossil species from the same time period.

Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms. For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years. By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.

However, the age of each fossil primate needs to be determined so that fossils of the same age found in different parts of the world and fossils of different ages can be compared. There are three general approaches that allow scientists to date geological materials and answer the question: "How old is this fossil? Relative dating puts geologic events in chronological order without requiring that a specific numerical age be assigned to each event.

Second, it is possible to determine the numerical age for fossils or earth materials. Numerical ages estimate the date of a geological event and can sometimes reveal quite precisely when a fossil species existed in time.

Third, magnetism in rocks can be used to estimate the age of a fossil site. This method uses the orientation of the Earth's magnetic field, which has changed through time, to determine ages for fossils and rocks. Geologists have established a set of principles that can be applied to sedimentary and volcanic rocks that are exposed at the Rock dating age of earth surface to determine the relative ages of geological events preserved rock dating age of earth the rock record.

For example, in the rocks exposed in the walls of the Grand Canyon Figure rock dating age of earth there are many horizontal layers, which are called strata. The study of strata is called stratigraphy, and using a few basic principles, it is possible to work out the relative ages of rocks.

In the Grand Canyon, the layers of strata are nearly horizontal. Most sediment is either laid down horizontally in bodies of water like the oceans, or on land on the margins of streams and rivers.

Each time a new layer of sediment is deposited it is laid down horizontally on top of an older layer. This is the principle of original horizontality: layers of strata are deposited horizontally or nearly horizontally Figure 2.

Thus, any deformations of strata Figures 2 and 3 must have occurred after the rock was deposited. Layers of rock are rock dating age of earth horizontally at the bottom of a lake principle of original horizontality.

Younger layers are deposited on top of older layers principle of superposition. Layers that cut across other layers are younger than the layers they cut through principle of cross-cutting relationships. The principle of superposition builds on the principle of original horizontality. The principle of superposition states that in an undeformed sequence of sedimentary rocks, each layer of rock is older than the one above it and younger than the one below it Figures 1 and 2.

Accordingly, the oldest rocks in a sequence are at the bottom and the youngest rocks are at the top. Sometimes sedimentary rocks are disturbed by events, such as fault movements, that cut across layers after the rocks were deposited. This is the principle of cross-cutting relationships. The principle states that any geologic features that cut across strata must have formed after the rocks they cut through Figures 2 and 3.

According to the principle of original horizontality, these strata must have been deposited horizontally and then titled vertically after they were deposited. In addition to being tilted horizontally, the layers have been faulted dashed lines on figure. Applying the principle of cross-cutting relationships, this fault that offsets the layers of rock must have occurred after the strata were deposited.

The principles of original horizontality, superposition, and cross-cutting relationships allow events to be ordered at a single location. However, they do not reveal the relative ages of rocks preserved in two different areas.

In this case, fossils can be useful tools for understanding the relative ages of rocks. Each fossil species reflects a unique period of time in Earth's history. The principle of faunal succession states that different fossil species always appear and disappear in the same order, and that once a fossil species goes extinct, it disappears and cannot reappear in younger rocks Figure 4. Fossils occur for a distinct, limited interval of time.

In the figure, that distinct age range for rock dating age of earth fossil species is indicated by the grey arrows underlying the picture of each fossil. The position of the lower arrowhead indicates the first occurrence of the fossil and the upper arrowhead indicates its last occurrence — when it went extinct. Using the overlapping age ranges of multiple fossils, it is possible to determine the relative age of the fossil species i.

For example, there is a specific interval of time, indicated by the red box, during which both the blue ammonite and orange ammonite co-existed. If both the blue and orange ammonites are found together, the rock must have been deposited during the time interval indicated by the red box, which represents the time during which both fossil species co-existed. In this figure, the unknown fossil, a red sponge, occurs with five other fossils in fossil assemblage B. Fossil assemblage B includes the index fossils the orange ammonite and the blue ammonite, meaning that assemblage B must have been deposited during the interval of time indicated by the red box.

Because, the unknown fossil, the red sponge, was found with the fossils in fossil assemblage B it also must have existed during the interval of time indicated by the red box. Fossil species that are used to distinguish one layer from another are called index fossils. Index fossils occur for a limited interval of time.

Usually index fossils are fossil organisms that are common, easily identified, and found across a large area. Because they are often rare, primate fossils are not usually good index fossils. Organisms like pigs and rodents are more typically used because they are more common, widely distributed, rock dating age of earth evolve relatively rapidly.

Using the principle of faunal succession, if an unidentified fossil rock dating age of earth found in the same rock layer as an index fossil, the two species must have existed during the same period of time Figure 4.

If the same index fossil is found in different areas, the strata in each area were likely deposited at the same time. Thus, the principle of faunal succession makes it possible to determine the relative age of unknown fossils and correlate fossil sites across large discontinuous areas. Unlike relative dating methods, absolute dating methods provide chronological estimates of the age of certain geological materials associated with fossils, and even direct age measurements of the fossil material itself.

To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events. Geologists also use other methods - such as electron spin resonance and thermoluminescence, which assess the effects of radioactivity on the accumulation of electrons in imperfections, or "traps," in the crystal structure of a mineral - to determine the age of the rocks or fossils.

All elements contain protons and neutrons, located in the atomic nucleus, and electrons that orbit around the nucleus Figure 5a. In each element, the number of protons is constant while the number of neutrons and electrons can vary. Atoms of the same element but with different number of neutrons are called isotopes of that element.

Each isotope is identified by its atomic mass, which is the number of protons plus neutrons. For example, the element carbon has six protons, but can have six, seven, or eight neutrons. Thus, carbon has three isotopes: carbon 12 12Ccarbon 13 13Cand carbon 14 14C Figure 5a. C 12 and C 13 are stable. The atomic nucleus in C 14 is unstable making the isotope radioactive. Because it is unstable, occasionally C 14 undergoes radioactive decay to become stable nitrogen N 14.

The amount of time it takes for half of the parent isotopes to decay into daughter isotopes is known as the half-life of the radioactive isotope. Most isotopes found on Earth are generally stable and do not change. However some isotopes, like 14C, have an unstable nucleus and are radioactive.

This means that occasionally the unstable isotope will change its number of protons, neutrons, or both. This change is called radioactive decay. For example, unstable 14C transforms to stable nitrogen 14N.

The atomic nucleus that decays is called the parent isotope. The product of the decay is called the daughter isotope. In the example, 14C is the parent and 14N is the daughter. Some minerals in rocks and organic matter e. The abundances of parent and daughter isotopes in a sample can be measured and used to determine their age.

This method is known as radiometric dating. Some commonly used dating methods are summarized in Table 1. The rate of decay for many radioactive isotopes has been measured and does not rock dating age of earth over time. Thus, each radioactive isotope has been decaying rock dating age of earth the same rate since it was formed, ticking along regularly like a clock. For example, when potassium is incorporated into a mineral that forms when lava cools, there is no argon from previous decay argon, a gas, escapes into the atmosphere while the lava is still molten.

When that mineral forms and the rock cools enough that argon can no longer escape, the "radiometric clock" starts. Over time, the radioactive isotope of potassium decays slowly into stable argon, which accumulates in rock dating age of earth mineral. The amount of time that it takes for half of the parent isotope to decay into daughter isotopes is called the half-life of an isotope Figure 5b.

When the quantities of the parent and daughter isotopes are equal, one half-life has occurred. If the half life of an isotope is known, the abundance of the parent and daughter isotopes can be measured and the amount of time that has elapsed since the "radiometric clock" started can be calculated. For example, if the measured abundance of 14C and rock dating age of earth in a bone are equal, one rock dating age of earth has passed and the bone is 5,730 years old an amount equal to the half-life of 14C.

If there is three times less 14C than 14N in the bone, two half lives have passed and the sample is 11,460 years old. However, if the bone is 70,000 years or older the amount of 14C left in the bone will be too small to measure accurately. Thus, radiocarbon dating is only useful for measuring things that were formed in the relatively recent geologic past.

Luckily, there are methods, such as the commonly used potassium-argon K-Ar method, that allows dating of materials that are beyond the limit of radiocarbon dating Table 1. Name of Method Age Range of Application Material Dated Methodology Radiocarbon 1 - 70,000 years Organic material such as bones, wood, charcoal, shells Radioactive decay of 14C in organic matter after removal from bioshpere K-Ar dating 1,000 - billion of years Potassium-bearing minerals and glasses Radioactive decay of 40K in rocks and minerals Uranium-Lead 10,000 - billion of years Uranium-bearing minerals Radioactive decay of uranium to lead via two separate decay chains Uranium series 1,000 - 500,000 years Uranium-bearing minerals, corals, shells, teeth, CaCO 3 Radioactive decay of 234U to 230Th Fission track 1,000 - billion of years Uranium-bearing minerals rock dating age of earth glasses Measurement of damage tracks in glass and minerals from the radioactive decay of 238U Luminescence optically or thermally stimulated 1,000 - 1,000,000 years Quartz, feldspar, stone tools, pottery Burial or heating age based on the accumulation of radiation-induced damage to electron sitting in mineral lattices Electron Spin Resonance ESR 1,000 - 3,000,000 years Uranium-bearing materials in which uranium has been absorbed from outside sources Burial age based on abundance of radiation-induced paramagnetic centers in mineral lattices Rock dating age of earth Nuclides 1,000 - 5,000,000 years Typically quartz or olivine from volcanic or sedimentary rocks Radioactive decay of cosmic-ray generated nuclides in surficial environments Magnetostratigraphy 20,000 - billion of years Sedimentary and volcanic rocks Measurement of ancient polarity of the earth's magnetic field recorded in a stratigraphic succession Tephrochronology 100 - billions of years Volcanic ejecta Uses chemistry and age of volcanic deposits to establish links between distant stratigraphic successions Table 1.

Comparison of commonly used dating methods. Radiation, which is a byproduct of radioactive decay, causes electrons to dislodge from their normal position in atoms and become trapped in imperfections in the crystal structure of the material. Dating methods like thermoluminescence, optical stimulating luminescence and electron spin resonance, measure the accumulation of electrons in these imperfections, or "traps," in the crystal structure of the material.

If the amount of radiation to which an object is exposed remains constant, the amount of electrons trapped in the imperfections in the crystal structure of the material will be proportional to the age of the material. These methods are applicable to materials that are up to about 100,000 years old. However, once rocks or fossils become much older than that, all of the "traps" in the crystal structures become full and no more electrons can accumulate, even if they are dislodged.

The Earth is like a gigantic magnet. It has a magnetic north and south pole and its magnetic field is everywhere Figure 6a. Just as the magnetic needle in a compass will point toward magnetic north, small magnetic minerals that occur naturally in rocks point toward magnetic north, approximately parallel to the Earth's magnetic field.

Because of this, magnetic minerals in rocks are excellent recorders of the orientation, or polarity, of the Earth's magnetic field. Small magnetic grains in rocks will orient themselves to be parallel to the direction of the magnetic field pointing towards the north pole.

Black bands indicate times of normal polarity and white bands indicate times of reversed polarity. Through geologic time, the polarity of the Earth's magnetic field has switched, causing reversals in polarity. The Earth's magnetic field is generated by electrical currents that are produced by convection in the Earth's core.

During magnetic reversals, there are probably changes in convection in the Earth's rock dating rock dating age of earth of earth leading to changes in the magnetic field. The Earth's magnetic field has reversed many times during its history.

When the magnetic north pole is close to the geographic north pole as it is todayit is called normal polarity. Reversed polarity is when the magnetic "north" is near rock dating age of earth geographic south pole. Using radiometric dates and measurements of the ancient magnetic polarity in volcanic and sedimentary rocks termed paleomagnetismgeologists have been able to determine precisely when magnetic reversals occurred in the past.

Combined observations of this type have led to the development of the geomagnetic polarity time scale GPTS Figure 6b.

The GPTS is divided into periods of normal polarity and reversed polarity. Geologists can measure the paleomagnetism of rocks at a site to reveal its record of ancient magnetic reversals. Every reversal looks the same in the rock record, so other lines of evidence are needed to correlate the site to the GPTS.

Information such as index fossils or radiometric dates can be used to correlate a particular paleomagnetic reversal to a known reversal in the GPTS. Once one reversal has been related to the GPTS, the numerical age of the entire sequence can be determined.

Using a variety of methods, geologists are able to determine the age of geological materials to answer the question: "how old is this fossil? These methods use the principles of stratigraphy to place events recorded in rocks from oldest to youngest. Absolute dating methods determine how much time has passed since rocks formed by measuring the radioactive decay of isotopes or the effects of radiation on the crystal structure of minerals.

Paleomagnetism measures the ancient orientation of the Earth's magnetic field to help determine the age of rocks. Evolutionary Anthropology 6: 63-75 1998. Isotopes: Principles and Applications. New York: Rock dating age of earth Wiley and Sons 2004. The Geologic Time Scale 2012, 2-volume set. Waltham, MA: Elsevier 2012. Geochronology on the paleoanthropological time scale, Evolutionary Anthropology 9, 101-110 2000.

Oxford, UK: Oxford University Press 1999. Berkeley, CA: University of California Press 2010. New York: John Wiley and Sons 2005.

How is the age of the Earth determined?

The same techniques of radiometric dating have been used on those rocks. All the data from Earth and beyond has led to the estimated age of 4.5 billion years for our planet. The age of rocks is determined by radiometric dating, which looks at the proportion of two different isotopes in a sample.

Radiometric Dating & the Age of the Earth: Bible History vs. Secular Science

How is the age of a rock determined by radiometric dating?

The numerical ages of rocks in the Geologic Time Scale are determined by radiometric dating, which makes use of a process called radioactive decay – the same process that goes on inside a nuclear reactor to produce heat to make electricity. Radiometric dating works because radioactive elements decay at a known rate.

How is absolute age dating used in geology?

Absolute age dating (or, radiometric dating) determines the age of a rock based on how much radioactive material it contains. Note: The following is modified from Ithaca is Gorges: A Guide to the Geology of the Ithaca Area, Fourth Edition by Warren D. Allmon and Robert M. Ross (2007).

Why is Earths age given by dating meteorites rather than its own rocks?

Why is Earths age given by dating meteorites rather than its own rocks? Bookmark this question. Show activity on this post. Reading a course on Precambrian, I read that: Earth Age (around 4.5 billion years) is dated thanks to the meteorites hitting Earth during its formation rather than the inner materials composing the Earth.

Laws of Relative Rock Dating

How did scientists determine the age of the Earth?

Bottom line: Scientists derived the age of Earth, 4.54 billion years, largely from studying the oldest rocks on our planet and meteorites formed early in the solar system’s history. The determined ages for rocks using radiometric dating.

How old is Earth?

Earth is estimated to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth searching for the oldest rocks to radiometrically date. In northwestern Canada, they discovered rocks about 4.03 billion years old.

How do we know the age of the universe and Earth?

Ask an Astronomer How do we know the age of the Universe and the Earth? (Intermediate) Scientists say that the Earth is 4.6 billion years old while the universe is somewhere from 10 to 20 billion years old. Is it true that in the 60s scientists spotted background radiation that they thought to be remnants of the Big Bang?

How is the age of the Solar System measured?

The age of the Solar System (including the Earth), on the other hand, is measured by the radioactive decay of certain isotopes in rocks and meteorites. These isotopes (principally Potassium and Uranium) were created with the solar system.

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