Sorry but this article was primarily directed to geologists and interested parties. It was on Geology.com. I posted it because I thought that it was readily understandable to most anyone.
Relax, bud.
No one's saying the article isn't understandable. Most Americans are familiar enough with the metric system to get the general idea of the measurements and quantities being expressed.
It's just a lot kinder to use units of measure your audience is most familiar with.