It contains large railway shops, several breweries, and saw and shingle mills.
To the south-east are the bare shingle banks of the promontory of Dungeness.
Most geologists hold that the valley is part of an old sea-bed, traces of which remain in numerous shingle-banks and beach-levels.
They are hemmed in and separated by snowcapped mountain peaks and ridges, which are seamed with glaciers terminating in moraines and shingle slopes at the base of the foot-hills.
The principal industrial establishments are shingle (especially cedar) and saw-mills, salmon canneries and factories for the manufacture of tin cans, and machinery used in the canning of salmon.
On the under-side, there are found attached fragments of limestone and quartz, showing that the shingle bed once extended up to it, and that it then formed the original floor.
To the latter belong the Greenshank and Redshank, as well as the Common Sandpiper, the " Summer-Snipe " above-mentioned, a bird hardly exceeding a skylark in size, and of very general distribution throughout the British Islands, but chiefly frequenting clear streams, especially those with a gravelly or rocky bottom, and mast generally breeding on the beds of sand or shingle on their banks.
The manufactories include rice mills, saw mills, sash, door and blind factories, shingle mills, iron works, oil refineries, broom factories and a dynamite factory.
They generally breed in association, often in the closest proximity - their nests, containing three eggs at most, being made on the shingle or among herbage.
North of the Needles there springs from the mainland a great shingle bank, mostly only a few yards in breadth above water, but nearly 2 m.
It is a low-lying broad bank of shingle, forming the seaward apex of the great level of the Romney Marshes.
There is good farming land in the vicinity and Alpena has lumber and shingle mills, pulp works, Portland cement manufactories and tanneries; in 1905 the city's factory products were valued at $2,905,263.
There are a sugar refinery and cooperage works, as well as large sawmills, shingle factories and many other industrial concerns.
The succession of beds in descending order is as follows: - (1) Shingle consisting of pebbles of limestone, slate and other local rocks, with fragments of stalagmite and containing a few bones and worked flints.
Hard rock (mostly granite and crystalline schists, with red sandstone in places) appears only in the transverse glens, which are often choked with their debris in the form either of gravel-and-shingle or loose blocks of stone or both.
The church of Nuestra Senora de Guadalupe (modernized with a shingle roof and a wooden steeple) contains interesting paintings and antique wood-carvings.
The formation of the coast varies from low, shifting banks of shingle or sand to majestic cliffs, and its character in different localities has been foreshadowed in the previous consideration of the hill-systems and lowlands.
ISLE OF PORTLAND, properly a peninsula of the coast of Dorsetshire, England, as a prolongation of a narrow ridge of shingle, Chesil Bank, connects it with the mainland.