Amber can tell us a great deal about the paleontological past, because it really is a window into the past that has experienced little visual change over millions of years.

The water inclusions containing the gas bubbles on the rare inclusions page can tell us something about the air on earth 40-50 million years ago.

Since Amber can be up to 345 million years old, floral and faunae inclusions can be just as old. Therefore, evolution of insects, (which do not generally preserve well in the fossil record, outside of amber) can be recorded with great detail.