Sleeping Giant (also known as the Blue Hills and Mount Carmel), (Hobbomock in Quinnipiac), is a rugged traprock mountain with a high point of , located north of New Haven, Connecticut. A prominent landscape feature visible for miles, the Sleeping Giant receives its name from its anthropomorphic resemblance to a slumbering human figure as seen from either the north or south. The Giant is known for its expansive clifftop vistas, rugged topography, and microclimate ecosystems. Most of the Giant is located within Sleeping Giant State Park. The mountain is a popular recreation site: over of hiking trails traverse it including of the Quinnipiac Trail. Quinnipiac University is located at Mount Carmel's foot in Hamden.
Geography
The Sleeping Giant, long by wide, is located in Hamden with its eastern edge falling into Wallingford. The Giant's profile features distinct "head," "chin," "chest," "hip," "knee," and "feet" sections topographically represented by traprock outcrops and ridge crests. The highest point is the Left Hip, , followed by the Chest, , and the Left Knee and Right Leg, each, and so on. The Giant's Head, , is marked by a cliff. A stone observation tower located on the Left Hip, built by the Works Progress Administration in the 1930s, offers 360° views of the surrounding Mill and Quinnipiac River valleys. An old rock quarry, closed since 1933 and now part of the state park, has left scars on the Giant's Head.
It is part of the narrow, linear Metacomet Ridge that extends from Long Island Sound north through the Connecticut River Valley of Massachusetts to the Vermont border. The Metacomet Ridge extends west and south from Sleeping Giant as Rocky Top and West Rock Ridge. The west side of Sleeping Giant drains into the Mill River thence to New Haven Harbor and Long Island Sound; the east side into the Quinnipiac River, thence to New Haven Harbor and Long Island Sound.
Geology
Sleeping Giant, a fault-block ridge that formed 200 million years ago during the Triassic and Jurassic periods, is composed of traprock, also known as basalt, an extrusive volcanic rock. Minor earthquakes have also been measured by seismographs and reported by residents. Basalt is a dark colored rock, but the iron within it weathers to a rusty brown when exposed to the air, lending the ledges a distinct reddish appearance. Basalt frequently breaks into octagonal and pentagonal columns, creating a unique "postpile" appearance. Huge slopes made of fractured basalt scree are visible beneath many of the ledges of Sleeping Giant. The basalt cliffs are the product of 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. These basalt floods of lava happened over a period of 20 million years. Erosion occurring between the eruptions deposited deep layers of sediment between the lava flows, which eventually lithified into sedimentary rock. The resulting "layer cake" of basalt and sedimentary sheets eventually faulted and tilted upward. Subsequent erosion wore away the weaker sedimentary layers at a faster rate than the basalt layers, leaving the abruptly tilted edges of the basalt sheets exposed, creating the distinct linear ridge and dramatic cliff faces visible today. One way to imagine this is to picture a layer cake tilted slightly up with some of the frosting (the sedimentary layer) removed in between.
Ecosystem
Sleeping Giant hosts a combination of microclimates unusual in New England. Dry, hot upper ridges support oak savannas, often dominated by chestnut oak and a variety of understory grasses and ferns. Eastern red cedar, a dry-loving species, clings to the barren edges of cliffs. Lower eastern slopes tend to support oak-hickory forest species common in the surrounding lowlands. Narrow ravines crowded with eastern hemlock block sunlight, creating damp, cooler growing conditions with associated cooler climate plant species. Talus slopes are especially rich in nutrients and support a number of calcium-loving plants uncommon in eastern Connecticut. Because the ridge generates such varied terrain, it is the home of several plant and animal species that are state-listed or globally rare. Sleeping Giant is also an important seasonal raptor migration path.