The Adirondack Mountains are not part of the Appalachian Mountains. They are a continuation of the Canadian Shield. Their origin is extremely ancient, dating back to the Mesoproterozoic era, in what is called the Grenville orogeny. After that old chain had been eroded away, recent uplifts produced the mountains we see today.
- Storey, Mike 2006. Why the Adirondacks look the way they do : a natural history. 2nd ed. ISBN 978-0-9777172-0-0