The geological formation of the Pyrenees consists both of primitive and secondary rocks—the latter being greater in mass, and composed of argillaceous schist, grauwacke (schistose and common), and limestone. Mines of lead, iron, and copper are found in this formation—the lead containing a proportion of silver. The primitive rocks are granite; and run in zones or belts, extended lengthwise in the direction of the chain; and it is in the rupture between these and the transition strata, that the chemical springs, for which the Pyrenees are so famous, gush forth. Of these remarkable fountains—many of them almost at boiling heat—no less than 253 have been discovered in different parts of the range. A great number of them are celebrated for their medicinal virtues, and are the favourite summer resorts of invalids, as well as the votaries of pleasure, from all parts of the world—but more especially from France and Spain.
The botany of the Pyrenees is full of interest. It may be regarded as an epitome of the whole European flora: since scarcely a plant exists, from the Mediterranean to the Arctic sea, that has not a representative species in some part of this mountain chain. In the valleys and lower slopes of the mountains the forest is chiefly composed of Lombardy poplars and sycamores; a little higher, the Spanish chestnut, oaks, hazels, and alders, the mountain ash and birch trees abound; and still farther up you enter the region of the pines—the pinus sylvestris growing in dense continuous forests, while the more graceful “stone pine” is seen only in isolated groups or scattered trees. Everywhere a rich flora meets the eye; flowers of the most lovely hues reflected in crystal rivulets—for the waters of the Pyrenees are pure beyond comparison, such a thing as a turbid stream being unknown throughout the whole range.
Above the pine forests the mountains exhibit a zone of naked declivities, stretching upward to the line of congelation—which in the Pyrenees is higher than upon the Alps. The former has been variously estimated: some fixing it at 8,300 feet, while others raise it as high as 9,000; but, indeed, it would be more just to say that the snow-line depends greatly upon the locality of the particular mountain, and its southern or northern exposure.
In any case, it is more than 1,000 feet higher than on the Alps; the superior elevation being accounted for, by the more southern latitude of the Franco-Spanish chain. Perhaps the proximity of the sea has more to do with this phenomenon than the trifling difference of latitude?
Upon the higher declivities and summits, snowfields and glaciers abound, as in the Alps; and even in some of the passes these phenomena are encountered. Most of the passes are higher than those of the Alps; but in consequence of the greater elevation of the snow-line, they remain open throughout the winter. At all seasons, however, they are by no means easy to traverse; and the cold winds that whistle through them are scarce to be endured. The Spaniards, who have a proverbial expression for almost every idea, have not neglected this one. In the ports (puertos) of the Pyrenees, say they, “the father waits not for his son, nor the son for his father.”
If the passes across these mountains are higher than those of the Alps, the transverse valleys are the reverse; those of the Pyrenees being in general much lower. The consequence is, that from the bottom of these valleys the mountains themselves appear far loftier than any of the Alpine peaks,—the eye taking in at one view a greater angle of elevation.
The fauna of the Pyrenean chain, though less full and varied than its flora, is nevertheless of great interest. In the more densely wooded solitudes, and higher declivities of the mountains, a large bear is found, whose light fulvous-coloured body and black paws pronounce him a different animal from the ursus arctos. If he be the same species, as naturalists assert, he claims at least to be a permanent variety, and deserves his distinctive appellation of ursus pyrenaicus.
Wolves abound; Spanish wolves, long famed for their fierceness; the common whitish-brown wolf (canis lupus), and a darker and still larger variety—in short, a black wolf, designated the “wolf of the Pyrenees,” though it is equally a denizen of the other mountain sierras of Portugal and Spain.
The European lynx (felis lynx), and the wild cat, both skulk through the Pyrenean forests; the former now only rarely seen. Along the naked cliffs leaps the “izzard,” which is identical with the chamois of the Alps (antelope rupicapra); and in the same localities, but more rarely seen, the “bouquetin,” or “tur” (aigocerus pyrenaicus)—a species of ibex, not identical with the capra ibex of Linnaeus and the Alpine mountains.
Birds of many European species frequent the lower forests of the Pyrenees, or fill the sheltered valleys with their vocal music; while, soaring above the mountain summits, may be seen the great vulture-eagle, or “lammergeyer,” watching with greedy eye the feeble lambkin, or the new-born kid of the ibex and izzard.