Purpose of this Blog

I have been planning for years to write something about mass extinctions. I hope to use this space to collect thoughts and references on large species extinction events in the earth's history. For example, I want to write about passenger pigeons, American chestnut trees, and dinosaurs. "Smaller" extinctions like the dodo bird and other island creatures are not off limits, but my main interest now is dominant species that covered a large range, and which were eliminated in a short span of time.