highlands geography

Granite reappears above the sea in the Isles of Scilly, 28 miles (45 km) farther southwest. More than 2,000 feet (610 metres) above sea level in places, it is characterized by the dry valleys, steep-sided gorges, and underground streams and caverns of a limestone drainage system rather than the bleak moorland that might be expected at this elevation. Coal swamps were laid down in the eastern region during this time (also during the Creataceous Period). Half of Sri Lanka's endemic flowering plants and 51 percent of the endemic vertebrates are restricted to this ecoregion.

Originally part of the super land mass Gondwanaland some 500 million years ago (Cambrian Period), it was formed after the movement of the earth's tectonic plates, travelling north, then finally separating about 95 million years ago. Below 700 feet (210 metres) lies a further series of former wave-cut surfaces. The linear Glen Mor—where the Caledonian Canal now threads the chain of lakes that includes Loch Ness—is the result of a vast structural sideways tear in the whole mass of the North West Highlands. It is truncated on most of three sides by steep gorges and valleys, making travel near impossible, and to the east by the steep escarpment above Wollongong and the Illawarra region.

On the contrary it is one of the oldest mountain chains on earth, like the Australian continent itself, worn down by hundreds of millions of years of erosion. The town of Robertson arose in its midst, still famous for its potatoes, although dairying has been of lesser importance in recent years. [8], Harris County Transit operates public transportation.

This is particularly true of the landscape around Alston, in Cumbria (Cumberland), which—cut off by faults on its north, west, and south sides—stands out as an almost rectangular block of high moorland plateau with isolated peaks (known to geographers as monadnocks) rising up above it. In addition, the really mountainous areas above 2,000 feet (600 metres) often form elevated plateaus with relatively smooth surfaces, reminders of the effects of former periods of erosion. In the east the valley network of the River Tweed and its many tributaries forms a broad lowland expanse between the Lammermuir and Cheviot hills. For every 100 females age 18 and over, there were 96.5 males. The general surface of the asymmetrically arched backbone (anticline) of the Pennines is remarkably smooth because many of the valleys, though deep, occupy such a small portion of the total area that the windswept moorland between them appears almost featureless. This vast trench is by no means a continuous plain, for high ground—often formed of sturdy, resistant masses of volcanic rock—meets the eye in all directions, rising above the low-lying areas that flank the rivers and the deeply penetrating estuaries of the Firth of Clyde and the Firth of Forth. Sandstone is still quarried today in Bundanoon. The flatness of the terrain means most of these flow inland.

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