Scientific controversy with radioisotopic dating
magazine has been continuously published since 1978, we are publishing some of the articles from the archives for historical interest, such as this.
For teaching and sharing purposes, readers are advised to supplement these historic articles with more up-to-date ones suggested in the Related Articles below.
The ice sheet produced large quantities of gravel, sand, and silt.
A mixture of these materials, called till, forms much of the soil in the Ohio and Upper Mississippi River valleys.
Those of us who live in the Midwest United States seem to have the worst of both worlds.
Hot humid summers, where the temperature often reaches 95 degrees, and cold winters where the mercury can plummet to zero.
In 1974, a third chronology of the area was published in By late 1974, the KBS Tuff had been dated five different times by four different dating methods.
The alleged compatibility of the different methods would seem to be a geologist’s dream.
Glaciers reached as far south as the current locations of the Ohio and Missouri Rivers, although the Wisconsin ice sheet, the most recent glacier, stopped midway across the extent of Illinois.Nevertheless Richard Leakey continued to fight for this original date. One gave an age of 1.6 million years and the other, where skull 1470 was found, gave 1.82 million years—both considerably younger than the five previous studies had reported.If skull 1470 was 2.9 million years old, he had discovered the oldest member of the genus ; if it wasn’t, he hadn’t! All of the above-cited articles spoke of the great difficulty in getting rock or crystal samples that were not altered, weathered, or derived from older rock. Roman poet Lucretius, intellectual heir to the Greek atomists, believed its formation must have been relatively recent, given that there were no records going back beyond the Trojan War.The Talmudic rabbis, Martin Luther and others used the biblical account to extrapolate back from known history and came up with rather similar estimates for when the earth came into being.