This page could really use a history section. Did you know that Cougar Mountain was originally known as Newcastle Hills and that coal was discovered here in the 1860's? I discovered a huge mine ventilation shaft myself when I was hiking out there last month. Supposedly there is also a ghost town called Newcastle.
This is the most historically significant peak in Washington considering that it transformed Seattle from a small logging community to the economic center of the greater Puget Sound area. Mining continued for 100 years on Cougar Mountain from 1863 to 1963 and it is estimated that 200 million pounds of coal were extracted.
There are also significant amber deposits, clay deposits, and fossil beds present including Echinoderms, gastropods, pelecypods and scaphopods. You might consider implementing some of this information into the Issaquah Alps page as well.