The Marl Ravine is a 6 mile, difficult single track mountain biking trail that is intended for advanced riders only. Helmets are required. The trail twists and turns as it follows steep ravines cut into ancient shell deposits from the Tertiary period when the entire area was submerged beneath a shallow sea. This creates a unique environment not usually common this far east. The trail is very steep and narrow in places and requires some advanced riding skills. Riders are warned that they should be mindful of overhanging obstacles, walk their bikes in some places, and remain alert for other bikers. Please familiarize yourself with trail etiquette and the rules-of-the-road before you attempt this trail.