absolute dates造句
例句与造句
- They date back to the Oligocene and Miocene and have been used for absolute dating of the rocks, using the relative proportions of two strontium isotopes in the fossils.
- The dates obtained from absolute dating techniques and measurements of weathering rind thicknesses are then used to construct an age versus thickness curve for dating rocks in other sedimentary deposits.
- Linking the observation of a solar eclipse with the archaeological, dendrochronological and textual data, she proposed an absolute dating for the chronology of the early second millennium BC.
- At the beginning of the 20th century, advancement in geological science was facilitated by the ability to obtain accurate absolute dates to geologic events using radioactive isotopes and other methods.
- From testing applied to furnaces remains and tools found next to these rocks, even though an absolute date cannot be assigned, it is considered to be some 5, 000 years old.
- It's difficult to find absolute dates in a sentence. 用absolute dates造句挺难的
- For example, in a stratum presenting difficulties or ambiguities to absolute dating, paleopalynology can be used as a relative referent by means of the study of the pollens found in the stratum.
- While the Bible contains few absolute dates, there is an overall coherent relative timeline of which events happened before or after which other events, and which individuals lived before or after which other individuals.
- Absolute dates, subject to a statistical uncertainty, are determined through radiometric dating using isotope ratios such as 40 Ar / 39 Ar dating, which can be used to identify the date of solidifying basalt.
- Absolute dating has not been carried out, but based on theoretical considerations, the cratered plains are thought to be ~ 4.5 billion years old, dating back almost to the formation of the Solar System.
- The absolute dating of Intef III's reign is less certain and several dates have been proposed : 2069 & ndash; 2061 BC, 2063 & ndash; 2055 BC and 2016 & ndash; 2009 BC.
- 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.
- Most scholars would now agree that the earliest reliable dates related to permanent human occupation can be traced back to about 1000 BCE, but different absolute dating technologies such as carbon-14 and thermoluminescence have provided variable results.
- 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.
- If long-term cratering rates are known to enough precision, crude absolute dates can be applied based on craters alone; however, cratering rates outside the Earth-Moon system are poorly known . ( Hartmann, 258)
- He fully agrees with absolute dating methods for clay tablets or coins like thermoluminescence dating, optically stimulated luminescence dating, archaeomagnetic, metallographic dating, but claims that their precision does not allow for comprehensive pinpointing on the time axis either.