Prose Idylls, New and Old

by Charles Kingsley

‘We allow that the great European oscillation, which ended in the production of the drift (the boulder clay, or till), was effected during a time of vast, but unknown length. And if we limit our inquiries, and ask what was the interval of time between the newest bed of gravel near Cambridge, and the oldest bed of bogland or silt in Cambridgeshire and Norfolk, we are utterly at a loss for a definite answer. The interval of time may have been very great. But we have no scale on which to measure it.’

Let us suppose, then, the era of ‘gravels’ past; the valleys which open into the fen sawn out by rivers to about their present depth. What was the special cause of the fen itself? why did not the great lowland become a fertile ‘carse’ of firm alluvial soil, like that of Stirling?

One reason is, that the carse of Stirling has been upheaved some twenty feet, and thereby more or less drained, since the time of the Romans. A fact patent and provable from Cramond (the old Roman port of Alaterna) up to Blair Drummond above Stirling, where whales’ skeletons, and bone tools by them, have been found in loam and peat, twenty feet above high-water mark. The alluvium of the fens, on the other hand, has very probably suffered a slight depression.

But the main reason is, that the silt brought down by the fen rivers cannot, like that of the Forth and its neighbouring streams, get safe away to sea. From Flamborough Head, in Yorkshire, all down the Lincolnshire coast, the land is falling, falling for ever into the waves; and swept southward by tide and current, the debris turns into the Wash between Lincolnshire and Norfolk, there to repose, as in a quiet haven.

Hence that vast labyrinth of banks between Lynn and Wisbeach, of mud inside, brought down by the fen rivers; but outside (contrary to the usual rule) of shifting sand, which has come inward from the sea, and prevents the mud’s escape—banks parted by narrow gullies, the delight of the gunner with his punt, haunted by million wild-fowl in winter, and in summer hazy steaming flats, beyond which the trees of Lincolnshire loom up, raised by refraction far above the horizon, while the masts and sails of distant vessels quiver, fantastically distorted and lengthened, sometimes even inverted, by a refraction like that which plays such tricks with ships and coasts in the Arctic seas. Along the top of the mud banks lounge the long black rows of seals, undistinguishable from their reflection in the still water below; distorted too, and magnified to the size of elephants. Long lines of sea-pies wing their way along at regular tide-hours, from or to the ocean. Now and then a skein of geese paddle hastily out of sight round a mud-cape; or a brown robber gull (generally Richardson’s Skua) raises a tumult of screams, by making a raid upon a party of honest white gulls, to frighten them into vomiting up their prey for his benefit; or a single cormorant flaps along, close to the water, towards his fishing ground. Even the fish are shy of haunting a bottom which shifts with every storm; and innumerable shrimps are almost the only product of the shallow barren sea: beside, all is silence and desolation, as of a world waiting to be made.

So strong is the barrier which these sea-borne sands oppose to the river-borne ooze, that as soon as a seabank is built—as the projectors of the ‘Victoria County’ have built them—across any part of the estuary, the mud caught by it soon ‘warps’ the space within into firm and rich dry land. But that same barrier, ere the fen was drained, backed up for ages not only the silt, but the very water of the fens; and spread it inland into a labyrinth of shifting streams, shallow meres, and vast peat bogs, on those impervious clays which floor the fen. Each river contributed to the formation of those bogs and meres, instead of draining them away; repeating on a huge scale the process which may be seen in many a highland strath, where the ground at the edge of the stream is firm and high; the meadows near the hillfoot, a few hundred yards away, bogland lower than the bank of the stream. For each flood deposits its silt upon the immediate bank of the river, raising it year by year; till—as in the case of the ‘Levée’ of the Mississippi, and probably of every one of the old fen rivers—the stream runs at last between two natural dykes, at a level considerably higher than that of the now swamped and undrainable lands right and left of it.

If we add to this, a slope in the fen rivers so extraordinarily slight, that the river at Cambridge is only thirteen and a half feet above the mean sea level, five-and-thirty miles away, and that if the great sea-sluice of Denver, the key of all the eastern fen, were washed away, the tide would back up the Cam to within ten miles of Cambridge; if we add again the rainfall upon that vast flat area, utterly unable to escape through rivers which have enough to do to drain the hills around; it is easy to understand how peat, the certain product of standing water, has slowly overwhelmed the rich alluvium, fattened by the washing of those phosphatic greensand beds, which (discovered by the science of the lamented Professor Henslow) are now yielding round Cambridge supplies of manure seemingly inexhaustible. Easy it is to understand how the all-devouring, yet all-preserving peat-moss swallowed up gradually the stately forests of fir and oak, ash and poplar, hazel and yew, which once grew on that rank land; how trees, torn down by flood or storm, floated and lodged in rafts, damming the waters back still more; how streams, bewildered in the flats, changed their channels, mingling silt and sand with the peat-moss; how Nature, left to herself, ran into wild riot and chaos more and more; till the whole fen became one ‘Dismal Swamp,’ in which the ‘Last of the English’ (like Dred in Mrs. Stowe’s tale) took refuge from their tyrants, and lived, like him, a free and joyous life awhile.

For there were islands, and are still, in that wide fen, which have escaped the destroying deluge of peat-moss; outcrops of firm land, which even in the Middle Age preserved the Fauna and Flora of the primæval forest, haunted by the descendants of some at least of those wild beasts which roamed on the older continent of the ‘gravel age.’ The all-preserving peat, as well as the monkish records of the early Middle Age, enable us to repeople, tolerably well, the primæval fen.

The gigantic ox, Bos primigenius, was still there, though there is no record of him in monkish tales. But with him had appeared (not unknown toward the end of the gravel age) another ox, smaller and with shorter horns, Bos longifrons; which is held to be the ancestor of our own domestic short-horns, and of the wild cattle still preserved at Chillingham and at Cadzow. The reindeer had disappeared, almost or altogether. The red deer, of a size beside which the largest Scotch stag is puny, and even the great Carpathian stag inferior, abound; so does the roe, so does the goat, which one is accustomed to look on as a mountain animal. In the Woodwardian Museum there is a portion of a skull of an ibex—probably Capra sibirica—which was found in the drift gravel at Fulbourne. Wild sheep are unknown. The horse occurs in the peat; but whether wild or tame, who can tell? Horses enough have been mired and drowned since the Romans set foot on this island, to account for the presence of horses’ skulls, without the hypothesis of wild herds, such as doubtless existed in the gravel times. The wolf, of course, is common; wild cat, marten, badger, and otter all would expect; but not so the beaver, which nevertheless is abundant in the peat; and damage enough the busy fellows must have done, cutting trees, damming streams, flooding marshes, and like selfish speculators in all ages, sacrificing freely the public interest to their own. Here and there are found the skulls of bears, in one case that of a polar bear, ice-drifted; and one of a walrus, probably washed in dead after a storm.

Beautiful, after their kind, were these fen-isles, in the eyes of the monks who were the first settlers in the wilderness.