Hiking is a big activity in NJ because of the mountains and the rocks that have formed. The rocks are mainly sedimentary and igneous do to how and when their formation occurred (approximately 1.3 billion years ago), granite and basalt being some of the most prevalent igneous rocks in the Highlands and in the town that I grew up in (Ringwood, NJ).
In the pictures shown above, the igneous rocks are intrusive, basalt. The intrusiveness can be determined by the area the rocks are in and the rocks are basalt because of the color and texture. The color is daark and light grays and the texture is fine-grained.
Some of the oldest rocks in NJ are located in the Highlands. There is even the Sterling Hill Mine in that same area. We went there on a field trip in third grade when we were learning about geology and were able to "mine" all of the different kinds of rocks that are found throughout NJ and take them home.
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