Three Types of Rocks at Olympic National Park

I need three types or rocks from Olympic National Park for a science project. Also:
-What type is it? (ex. Igneous, intrusive?)
-Why is it there? How did it form in the park?
-Minerals that make up the rock?
And any diagrams that come with
and most importantly the URL you got it from. Need to cite my sources. :) Thanks

If I had such a project, I would start with the USGS. They'll be a wealth of all of the above.

http://geomaps.wr.usgs.gov/parks/olym/in…