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How are rocks and fossils dated? What Fosiles congelados yahoo dating is used to tell how old a fossil is, and where did that method come from, how long ago.
How do we determine which radio-metric data is valid or not? There seems to be many experts in this area-I'm sure to get a good answer. I can stand it no longer Okay-2 fair answers.
The the age of rocks and fossils is determined by the 'index fossil" found in the same strata as the 'sample". Based on the Lyell's et. Each layer has a specific fossil to identify it. Correct
Fosiles congelados yahoo dating is sometimes Correct C is sometimes used to date more recent fossils, and other methods for much older fossils and rocks.
However all data from radio-metric dating is discarded as faulty if it does not agree with index fossil. So-the strata is dated by which index fossil it has, then the fossils can be dated by in which strata they are found. The bottom line-they do not know.
I know you can't believe thatjust check it out. Are you sure you want to delete this answer? The fact that fossils are formed in sedimentary rock lets us put them in a chronological sequence. In the formation of sedimentary rock a layer of mud hardens and then another layer is formed on top of it. The resulting rock consists of a series of horizontal strata, each containing fossils characteristic of the time when it was laid down.
The oldest rock, and therefore the earliest fossils, are contained in the lowest strata. There are places where these strata have been exposed. In cliff faces for instance, or the Grand Canyon in Arizona. You can compare like fossils with like Fosiles congelados yahoo dating and like rocks with like rocks, even though they may lie along way apart. Rough estimates on dates can be made on the time it takes for sedimentary rocks to be laid down, but that is not very accurate.
More accurate methods are based on the fact that the older the rock is, the less radioactive it is. This decline in radioactivity is due to radioactive elements in decaying to their non-radioactive isotopes.
These decay rates have been accruately measured and are well known. For older rocks and fossils the potassium-argon method is useful because potassium is a common element found in all kinds of rock and decays
Fosiles congelados yahoo dating argon very slowly.
For younger fossils that contain organic material carbon 14 is useful as it is extremely accurate.
It is not of any use for anything over 70, years old as the carbon has completely disintegrated to normal carbon. Fossils from Latin fossus, literally "having been dug up" are the mineralized or otherwise preserved remains or traces such as footprints of animals, plants, and other organisms.
The totality of fossils and their placement in fossiliferous fossil-containing rock formations and sedimentary layers strata is known as the fossil record. The study of fossils is called paleontology.
Rocks are classified by mineral and chemical composition; the texture of the constituent particles; and also by the processes that formed them. These indicators separate rocks into igneous, sedimentary, and metamorphic. It doesn't work on rocks, pottery, etc. It works because when organisms are alive, they accumulate carbon during biological processes. Some of the carbon is carbon 14, a radioactive element whose ratio to normal carbon in living things and whose ratio to normal carbon in the atmosphere is constant.
When the organism dies, it stops accumulating carbon, and the carbon 14 decays radioactively with a half-life of abtou 5, years. That means 5, years after something dies, there will be half as much carbon 14 as there was when it was alive. Measuring the ratio of carbon 14 to normal carbon in a fossil can give a pretty accurate measure of how long ago an organism died. Artifacts that were never alive stone tools, for example is done by correlating multiple data points the strata in which the artifact was discovered, nearby objects, geological history of the area, etc.
It's less accurate for individual objects than carbon 14 dating is, but for large geological areas where many data points can be well-correlated it can give very accurate results. If the point of this question was to ask if the earth really is more than 6, or so years old -- the answer is a definitive YES.
The bible literalists who claim a young earth have no evidence to support their claims, and mountains of scientific evidence to prove them wrong. Carbon dating is only useful for relatively recent objects, it is more often used to date man-made artefacts. Fossils are dated using radiometric data from heavier elements like Uranium and by analysis of the strata in Fosiles congelados yahoo dating they appear.
Radiometric data is considered valid if several readings on the same object fall within a reasonable margin of error. It covers, who what when where how etc.
InLibby was awarded the Nobel Prize in chemistry for radiocarbon dating. Send me a message or submit another question if you need further assistance. They use Carbon and Carbon Carbon has a half-life of 5, years to decay. Carbon a constant and they can compare the ratio of carbon to carbon and get an appoximation of age.
Try the link below or go to Google search and type in 'how are rocks and fossils dated'. Depends on the relative age. To date very old materials billions of years you'll usually employ potassium-argon, uranium-lead, or rubidium-strontium. For "newer" dating you'll commonly see C dating, as well as uranium-thorium-protactinium dating.
Carbon dating is used to determine the age of things. Carbon dating is one of the methods, but there are other methods using radioactive decay as well. All produce the same range of results within error of course. "Fosiles congelados yahoo dating"
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