A water gap is a geological feature where a river cuts through a mountain ridge. The Delaware Water Gap began to form 450 million years ago when quartz pebbles were deposited in a shallow sea, on top of the Ordovician Martinsburg shale. The Martinsburg Shale was uplifted when a chain of volcanic islands collided with North America around the same time. These islands went over the North American plate, and deposited rock on top of plate, forming the Highlands and Kittatinny Valley. The Delaware Water Gap is about 300 meters across at river level and about 1400 meters wide at the top. The river through the gap is 283 feet above sea level. The ridge of the Appalachians that the Delaware crosses is called the Blue Mountains in Pennsylvania and the Kittatinny Ridge in New Jersey. This is the first major ridge of the Appalachian mountains. The New Jersey mountain is Mount Tammany, named after the Native American Chief Tamanend. The Pennsylvania mountain is Mount Minsi, named after the Native American Tribe of the area.
This cache is located on personal property with the permission of the owner. Hours of cache accessibility are Tuesday through Sunday 12pm to 5pm EST, and Friday nights from 6:30pm to 10pm. Please do not attempt to find this cache outside those approved by the property owner.