Matthew proposed Mountain as a type of course.
I have seen "Mountain" courses with extremely rocky terrain, others with loam, clay, and even sand, or sand pockets, or volcanic sand layers.
I have seen "Mountain" courses with thick natural forest typical of a rainy site, others with natural pine trees more typical of a drier site, and mountain courses with no natural trees, typical of a very dry, windy site.
I have seen "Mountain" courses that are flatter than some links courses (eg Gullane #1).
I have seen "Mountain" courses play wet and soft, others faster and drier than many links.
I have seen bent grass, fescue, blue grass and rye grass "Mountain Courses".
I have seen "Mountain Courses" designed for the aerial game and others that play like links.
It is impossible to categorize. And it is not smart to dismiss a course based on its perceived category.