Figure 3. Potassium-argon "ages" in millions of years for historic lava flows.<quoted text>Source, please.
Another example is found at the Grand Canyon in Arizona. The bottom layers of the canyon are widely held to be about one billion years old, according to evolutionary chronology. One of these layers is the Cardenas Basalt, an igneous rock amenable to radioisotope technology. When dated by the rubidium-strontium isochron method the Cardenas Basalt yielded an "age" of 1.07 billion years, which is in agreement with the evolutionary chronology.3
However, volcanoes of much more recent origin exist on Grand Canyon's north rim. Geologists agree that these volcanoes erupted only thousands of years ago, spilling lava into an already eroded Grand Canyon, even temporarily damming the Colorado River. Rocks from these lava flows have been dated by the same rubidium-strontium isochron method used to date the Cardenas Basalt, giving an "age" of 1.34 billion years.4 This result indicates that the top of the canyon is actually older than the bottom! Such an obviously incorrect and ridiculous "age" speaks eloquently of the great problems inherent in radioisotope dating.(Numerous other radioisotope "ages" are also given.)
Radioisotope dating is widely perceived to be the "gold standard" of dating methods and the "proof" for millions of years of earth history. But when the method is tested on rocks of known age it fails miserably.(The lava dome at Mount St. Helens is really not a million years old! We were there! We know!) By what twisted logic then are we compelled to accept radiometric dating results performed on rocks of unknown age? I would submit we are not so compelled, but rather called to question and challenge those who promote the faith of radioisotope dating. promote the faith of radioisotope dating.