A hidden gem of nature lies a short distance from downtown Tulsa, OK, amidst the urban sprawl. It's over 750 acres of urban wilderness within a series of parks and venues along the scenic Arkansas River. The appeal is the diverse terrain boasting over 45 miles of hiking and biking trails. The city's comforts and amenities are close, but it's large enough to escape the fast pace and noise to enjoy the serenity of nature. Beneath the tranquil canopy is a rich collection of geologic events and wonders. Even a short hike on Turkey Mountain raises intriguing questions about its origin and history. How old is it? Why do we see so many rock layers? Do the rocks contain fossils? Was oil produced on Turkey Mountain? This guide answers these questions and many more. This guide presents a brief geological history to frame what we see today. It includes photos of common fossils and features on the trails, with concise descriptions avoiding lengthy technical discussions found in textbooks. Some features, like ripple marks, are unmistakable once their story is understood.