Radiometric dating methods geology
Keep that in mind when you think about working out the age of something. Actually, knowing the starting time is still not enough.During the race you have to watch the swimmer and count how many laps he has swum so you know that he has done 1,500 metres.A common goal of stratigraphic studies is the subdivision of a sequence of rock strata into mappable units, determining the time relationships that are involved, and correlating units of the sequence—or the entire sequence—with rock strata elsewhere.Following the failed attempts during the last half of the 19th century of the International Geological Congress (IGC; founded 1878) to standardize a stratigraphic scale, the International Union of Geological Sciences (IUGS; founded 1961) established a Commission on Stratigraphy to work toward that end.Those who promote the reliability of the method spend a lot of time impressing you with the technical details of radioactive decay, half-lives, mass-spectroscopes, etc.But they don’t discuss the basic flaw in the method: you cannot determine the age of a rock using radioactive dating because no-one was present to measure the radioactive elements when the rock formed and no-one monitored the way those elements changed over its entire geological history.Accordingly, it is presumed that the remains of each succeeding generation are left on the debris of the last.The radioisotope methods—long touted as irrefutably dating the earth as countless millions of years old—have repeatedly failed to give reliable and meaningful absolute ages for Grand Canyon rocks.
Would it make any difference if the watch we were using was more accurate? You could talk about the tiny quartz crystal and the piezoelectric effect used to provide a stable time base for the electronic movement.
But the basic concept of radioactive dating, sometimes called radiometric dating, is not difficult, especially since all of us regularly calculate how much time has passed: for example, since our birth, or since we started on a walk.
A swimming race is a familiar situation that illustrates the simple principles involved in measuring time.
And you have to check to make sure he touches the end for each lap.
Without these observations you cannot be sure that the time is valid.
In the walls of the Grand Canyon, we can see that the whole horizontal sedimentary strata sequence was folded without fracturing.