Название | Caves and Cave Life |
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Автор произведения | Philip Chapman |
Жанр | Биология |
Серия | Collins New Naturalist Library |
Издательство | Биология |
Год выпуска | 0 |
isbn | 9780007403974 |
Fig. 1.4 Gough’s Cave digging in early 1935, first published in Bristol Evening World, 1 Feb 1935. (Trevor Shaw collection, courtesy of Cheddar Caves Ltd.)
In the 1830s, Schmerling recognized that the remains of humans and of extinct mammals found together in the same deposits in Belgium were of the same age. It was not, however, until later in the century, that the work of William Pengelly and Boyd Dawkins and their colleagues established that these remains dated back thousands of years to the Ice Ages of the Pleistocene era, when cave-dwelling people shared our familiar countryside with a fearsome array of giant animals, including cave bears, hyaenas, woolly mammoth, bison, aurochs and woolly rhinoceros. Excavation in caves has, of course, continued to the present day, and cave sites worldwide have now yielded material which has helped to shape our understanding of human evolution and the birth of our culture.
The systematic exploration, documentation and commercial exploitation of caves was already underway in China many centuries before miners and natural historians first began to measure and record details of our European cave systems in a scientific way. One of the first of this breed of explorers in Britain was John Beaumont, a 17th century Somerset surgeon and an amateur student of mining and geology. When in 1674 lead miners excavating a shaft in the Mendip Hills accidentally breached a natural underground chamber, Beaumont hastened to the site and hired six miners to accompany him into the cave. Carrying candles, the company descended the 18 m shaft to the first chamber, which Beaumont proceeded to measure: it was 73 m long, two metres wide and nine metres high. “The floor of it is full of loose rocks,” wrote Beaumont in his subsequent report to the Royal Society, “its roof is firmly vaulted with limestone rocks, having flowers of all colours hanging from them which present a most beautiful object to the eye.” The intrepid surgeon then led a 100 m crawl through a further low passage which opened into the side of a second chamber, so vast, Beaumont reported, that “by the light of our candles we could not fully discern the roof, floor, nor sides of it.” The miners, accustomed as they were to the underground, could not be persuaded to enter this chasm, even for double pay. So Beaumont went down himself:
Fig. 1.5 Interior Chamber of Cox’s Stalactite Cavern, Cheddar, Somersetshire. Lithograph by Newman & Co. London; pub. S. Cox, Cheddar about 1850. (Courtesy of Trevor Shaw)
“I fastened a cord about me, and ordered them to let me down gently. But being down about two fathom I found the rocks to bear away, so that I could touch nothing to guide myself by, and the rope began to turn round very fast, whereupon I ordered the miners to let me down as quick as they could.”
He landed dizzy but safe 21 m below, on the floor of a cavern 35 m in diameter and nearly 37 m high within which he found large veins of lead ore. Surprisingly, Beaumont’s account failed to stimulate much curiosity about caves in scientific circles, and after a brief flurry of lead mining, the cave, known as Lamb Leer, was abandoned; its entrance shaft eventually collapsed and the sealed-off chamber was virtually forgotten for two centuries.
The rediscovery of Beaumont’s long-lost Lamb Leer cave took place in 1879, the same year that a young French law student, Edouard-Alfred Martel, made his first visit to the famous Adelsberg Cave in Slovenia (which was then part of Austria, but since World War II has reverted to its local name of Postojna Jama). Martel was completely enthralled, and in 1883 began to devote all his vacation time to cave explorations in the Causses of southwestern France. What set him apart from previous cave explorers, was his meticulous preparations and his systematic recording of all aspects of the caves he explored, combined with a tremendous physical ability and courage. His speciality was deep vertical pits, and in 1889 he successfully negotiated the 213 m vertical entrance shaft of the Rabanel pothole north-west of Marseilles – an outstanding feat given the equipment then available.
To calculate a pit’s depth, he would read the barometric pressure at the bottom and compare it with the surface pressure. He measured the horizontal dimensions of each newly-discovered chamber with a metal tape, drawing a sketch of the cave as he worked. Roof heights were calculated with an ingenious contraption: after attaching a silk thread to a small paper balloon, he would suspend an alcohol-soaked sponge beneath it, light the sponge, and measure off the length of thread carried aloft by the miniature hot-air balloon. Martel also habitually recorded subterranean air and water temperatures, finding variations with depth and season, and amassed whole volumes about cave geology, hydrology, meteorology and flora and fauna. But perhaps his greatest contribution to cave science was his research on how subterranean water circulates – a study prompted by his own bout with ptomaine poisoning, contracted from drinking spring water in 1891. After recovering from the illness, he traced the spring’s source using fluorescein dye introduced to nearby sink holes. Descending the appropriate pit, he found the putrefying carcass of a dead calf that had contaminated the spring with what he wryly termed “veal bouillon”. Further study allowed him to distinguish between “true springs”, fed by diffuse circulation of rainwater, cleaned and filtered by its passage through soil and rocks, and “false springs” fed by a rapid flow from sinkholes via cave passages too large to filter out impurities. Martel’s subsequent campaigning for stricter control of sources of drinking water eventually led to a dramatic reduction in deaths from typhoid and won him a gold medal from the French Government.
In 1895 Martel founded the French ‘Société de Spéléologie’, arguing that ‘speleology’, which had been previously considered a sport or a singular eccentricity, should be recognized as a fully-fledged science – “a subdivision of physical geography, like limnology for lakes and oceanography for seas.” A prolific author, he edited Spelunca, his Society’s bulletin, and wrote books about his own cave discoveries. In 1907 the French Academy of Sciences awarded him the grand prize for physical sciences, and in 1928 he was elected president of the Geographical Society of Paris. By the time he died in 1938, aged 78, the grand old man of speleology had personally probed nearly 1500 caves, hundreds of which had never been entered before; his technical innovations had become standard equipment for other cavers; and above all, his persistence and dedication had created a framework within which the seedling science of speleology could develop and blossom.
Meanwhile, the systematic documentation of caves had also started in Britain, with the formation of the Yorkshire Ramblers’ Club in 1892. Under the influence of S.W. Cuttriss, dubbed ‘the scientist’ for his assiduity in recording the group’s findings, its members drew up surveys of the caves they explored, and kept notes of temperatures, altitudes and geographical features.
The great exploration challenge of the day was the awesome Gaping Gill, a pothole high on the slopes of Ingleborough Hill which had been plumbed to a depth of 110 m, but had never been descended. The main obstacle to its exploration came from Fell Beck, an icy stream which cascades down the entrance, filling it with spray and extinguishing any flame which might light a caver’s descent, as well as half-drowning him. A local man, John Birkbeck, had made two heroic, but unsuccessful attempts to descend the pit in the 1840s, after digging a trench to divert the Fell Beck to another sink. His first try nearly proved fatal, when strands of his rope were severed on a rock ledge, but on his second attempt he reached a ledge at 58 m which now bears his name. Yorkshire Ramblers’ member Edward Calvert took up the challenge and had almost completed his own preparations for a descent on rope ladders in 1895, when Martel arrived on the scene, hot-foot from London where he had been invited to address an International Geographical Congress on cave-hunting methods.
As something of a