include Lake Dawson and Lake Watrous. Konolds Pond, which is not used as a water source, is located just north of Rt. 15 in an industrial area. The main body of water inside the park is Lake Wintergreen, , located east of the ridge. There is also a small fishing pond located near Mountain Road, and a flood control pond located at the north end of the park. The Wilbur Cross Parkway (Route 15) passes through the south central side of the mountain in the West Rock Tunnel, also known as the Heroes Tunnel. A network of suburban streets abut the mountain on all sides and a seasonal paved park road climbs to the crest of the ridge and along its length. Several communications towers sprout from the ridge crest. The Metacomet Ridge extends north from West Rock Ridge as Mad Mare Hill and Mount Sanford and northeast as Rocky Top and Sleeping Giant. East of West Rock Ridge, the Metacomet Ridge spreads out into a series of low, parallel ridges toward Saltonstall Mountain in Branford, Connecticut; the only noteworthy summit in between is East Rock which looms over New Haven from the north. The west side of West Rock Ridge drains into West River, then into Long Island Sound; the east side into Belden Brook thence to West River, and the north side into Mill River thence to New Haven Harbor and Long Island Sound. Geology The fault-block ridge of West Rock is composed of diabase (sometimes referred to as trap rock), an intrusive volcanic rock. Diabase is a dark colored rock, but the iron within it weathers to a rusty brown when exposed to the air, lending the ledges of West Rock Ridge a distinct reddish hue. The rock, which formed 200 million years ago during the late Triassic and early Jurassic periods, frequently breaks into octagonal and pentagonal columns, creating a unique "postpile" appearance. Huge slopes made of fractured rock scree are visible beneath many of the ledges of West Rock Ridge. The ridge is the product of a huge feeder dike that supplied several massive lava flows hundreds of feet deep that welled up in faults created by the rifting apart of North America from Eurasia and Africa over a period of 20 million years. Erosion occurring between the eruptions deposited deep layers of sediment between the lava flows and around the dike, which formed sedimentary