The Lake District's geology is complex but well-studied. Its oldest rocks are the Skiddaw Slate series and the Borrowdale Volcanic series dating back to the Ordovician, some 500 million years ago. The Skiddaw Slates are found in the northern part of the park and were probably deposited in shallow seas; their thickness is unknown. The Borrowdale Volcanic rocks are more extensive and form the Lakes' highest peaks, being resistant to weathering. Later intrusions have formed individual outcrops of igneous rock in both these series. The other large rock group is the Silurian Windermere Group, made of Limestone that rests upon the volcanic rocks. Many smaller series are also present.

If you are interested in the geology of The lake District then we can recommend the following attractions:

The Threlkeld Quarry & Mining Museum

The mine is situated three miles east of Keswick, in the heart of the breathtaking Lake District in Cumbria. The quarry and museum have been lovingly run by our knowledgeable and dedicated staff for more than ten years, and the site continues to expand through the dedication of the staff and volunteers.

The museum offers activities for all the family, from budding geologists to hopeful prospectors.

It includes:

• An underground tour of a realistic mine experience
• A comprehensive geological and mining museum
• The quarry site with a unique collection of machinery
• Mineral panning
• School or student groups welcome by arrangement
• Ample free parking, shop and hot and cold drinks

The museum is open 7 days a week from Easter to October.
Visit the Threlkeld Mine website

Honister Slate Mine

Located at the head of the Honister Pass in the centre of the Lake District, they produce the world famous Westmorland Green– a beautiful, functional material that has been extracted here for centuries. 
Our slate is 400 Million years old!

Visit Honister Slate Mine website