Rhonda, I haven't looked in the plate tectonics for the various US mountain ranges. I do know that we have hundreds of feet of limestone here. And limestone is made up of:
So, we're on top of a column of dead sea creatures that took millions of years to form. The critters are/were microscopic and we build buildings out of their remains.
You see this kind of thing all the time:
![[Image: roadcut01.jpg]](https://images.weserv.nl/?url=arkansasroadstories.com%2Fnature%2Froadcut01.jpg)
Quote:https://en.wikipedia.org/wiki/Limestone
[url=https://webcache.googleusercontent.com/search?q=cache:lrp4wHEGcXUJ:https://en.wikipedia.org/wiki/Limestone+&cd=14&hl=en&ct=clnk&gl=us][/url]
Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3). About 10% of sedimentary rocks are limestones.
So, we're on top of a column of dead sea creatures that took millions of years to form. The critters are/were microscopic and we build buildings out of their remains.
You see this kind of thing all the time:
