" Even modest temperature increases of a few hundred kelvins can cause argon to diffuse..." Modest? Even a "mere" 300 degrees Kelvin is a 540 degree change on

" Even modest temperature increases of a few hundred kelvins can cause argon to diffuse..." Modest? Even a "mere" 300 degrees Kelvin is a 540 degree change on the Fahrenheit scale. Also, in the photo caption: "The red peaks in this rock from Greenland, which dates to 3.7 billion years ago, may be fossil stromatolites—layered structures created by the earliest microbes." To me, those look nothing like known stromatolites, which form more or less as cylinders as the microbe layers stack up.