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There are two ways to date fossil remains: relative dating and physical dating. The first method calculates the layers and the origin of the deposits on the fossil. The second method uses natural clocks (that use physical properties) to calculate how much time has passed since the organism has died. The most famous method is called radiocarbon dating which detects carbon-14 (which is a form of carbon). By measuring the amount of carbon-14 left in the deceased organism, we can determine when the organism died. Another technique that combines relative and physical dating is palaeomagnetism. It uses the Earth's magnetic poles and the position at which they were when the organism died, allowing us to calculate at which period of time that was. | There are two ways to date fossil remains: relative dating and physical dating. The first method calculates the layers and the origin of the deposits on the fossil. The second method uses natural clocks (that use physical properties) to calculate how much time has passed since the organism has died. The most famous method is called radiocarbon dating which detects carbon-14 (which is a form of carbon). By measuring the amount of carbon-14 left in the deceased organism, we can determine when the organism died. Another technique that combines relative and physical dating is palaeomagnetism. It uses the Earth's magnetic poles and the position at which they were when the organism died, allowing us to calculate at which period of time that was. | ||
= | =How do we know that ''Orrorin tugenensis'' was a hominin? = | ||
The main proof is found by looking at the shape and anatomical features of the leg bones. The femur of ''Orrorin tugenensis'' ressembles that of ''Australopithecus'' and other fossil apes from the Miocene with its unique shape, i.e. a long and flat femoral neck, implying that it was a bipedal. However, the dentition and powerful arms of ''Orrorin tugenensis'' indicate some similarities with apes, which leaves somewhat of a nuance to this argument. --[[Utilisateur:GavinC|GavinC]] ([[Discussion utilisateur:GavinC|discussion]]) 30 mars 2020 à 16:43 (CEST) | |||
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Version du 30 mars 2020 à 16:43
How to date fossil remains?
There are two ways to date fossil remains: relative dating and physical dating. The first method calculates the layers and the origin of the deposits on the fossil. The second method uses natural clocks (that use physical properties) to calculate how much time has passed since the organism has died. The most famous method is called radiocarbon dating which detects carbon-14 (which is a form of carbon). By measuring the amount of carbon-14 left in the deceased organism, we can determine when the organism died. Another technique that combines relative and physical dating is palaeomagnetism. It uses the Earth's magnetic poles and the position at which they were when the organism died, allowing us to calculate at which period of time that was.
How do we know that Orrorin tugenensis was a hominin?
The main proof is found by looking at the shape and anatomical features of the leg bones. The femur of Orrorin tugenensis ressembles that of Australopithecus and other fossil apes from the Miocene with its unique shape, i.e. a long and flat femoral neck, implying that it was a bipedal. However, the dentition and powerful arms of Orrorin tugenensis indicate some similarities with apes, which leaves somewhat of a nuance to this argument. --GavinC (discussion) 30 mars 2020 à 16:43 (CEST)
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