absolute age वाक्य
उदाहरण वाक्य
मोबाइल
- I'd check all the external links, but they are so full of adverts it is taking an absolute age to load.
- In the absence of reliable methods for obtaining absolute ages for rocks, it was thought that reversals occurred approximately every million years.
- If an absolute age can be obtained with a high degree of accuracy for different strata, their relative age can also be established.
- Aside from an absolute age limit, the sides are considering adding additional years to the rookie wage scale for players younger than a certain age.
- Absolute age dating with the radiocarbon method was done by Michel Genty on a burnt tooth found in a fireplace below the " man and bison ".
- Because the process is not thought to vary significantly in mechanism over time, it is also a valuable tool in estimating the absolute ages of certain materials.
- This is an important observation for studies of the surface of Venus, as crater are used to determine relative ages and to approximate absolute ages of surface features.
- As it has been found on Martian meteorites, its ages have been calculated to obtain absolute ages when liquid water was at or near the surface of Mars.
- The absolute age of the Nemegt Formation is unknown but it is thought to be Maastrichtian or maybe late Campanian in age, very roughly some 76-65 million years old.
- However, methods using extinct radionuclides give only relative ages and have to be calibrated with radiometric dating techniques based on long living radionuclides like Pb-Pb-dating to give absolute ages.
- This is done by determining the absolute age of sedimentary deposits containing either gravel-size rocks or artifacts using absolute dating methods such as C 14 and measuring the weathering-rind thickness of rocks of similar lithology.
- Biostratigraphy does not " directly " provide an absolute age determination of a rock, but merely places it within an " interval " of time at which that fossil assemblage is known to have coexisted.
- The science of geochronology is the prime tool used in the discipline of chronostratigraphy, which attempts to derive absolute age dates for all fossil assemblages and determine the geologic history of the Earth and extraterrestrial bodies.
- With isotopic dates, it became possible to assign absolute ages to rock units, and these absolute dates could be applied to fossil sequences in which there was datable material, converting the old relative ages into new absolute ages.
- With isotopic dates, it became possible to assign absolute ages to rock units, and these absolute dates could be applied to fossil sequences in which there was datable material, converting the old relative ages into new absolute ages.
- Kubler already establishes that there are two standards of duration, " absolute age " and " systematic age . " He sees these as different " envelopes " of time established by the content of each segment of time.
- A consequence of this approach to the Phanerozoic periods is that the ages of their beginnings and ends can change from time to time as the absolute age of the chosen rock sequences, which define them, is more precisely determined.
- If the rate of impact crater formation on Mars by crater size per unit area over geologic time ( the production rate or flux ) is known with precision, then crater densities also provide a way to determine absolute ages.
- In older sequences diagenetic alteration combined with greater uncertainties in estimating absolute ages due to lack of overlap between other geochronometers ( for example U-Th ) leads to greater uncertainties in the exact shape of the Sr isotope seawater curve.
- By using radiolarian stratigraphy a more recent study by Wegener, Suzuki & Gawlick ( 2003 ) found a Middle Oxfordian to Lower Kimmeridgian age for the upper red radiolarite, i . e . an absolute age of 159-154 million years BP.
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