I know that at some point in the distant past when trees fell. There is no microbes or anything to decompose that they just laid there. Then after a period time microbes and other things were able to break down the trees. Which at some point that became coal.

What I’m curious about Is that the only time that coal was able to be created? That was worded poorly. What I’m curious of is that group of trees that fell over during that period of time is that the only trees that was to create coal. Or is this an ongoing process?

In other words, the trees that fall today will be at some point become coal?