NATURE CALLS
âAS OLD AS The HILLSâ IS an apt expression when one looks at the physical entity that is County Galway today. The term implies natural antiquity and thanks to radiometric and fossildating techniques, we now have the means of finding out how ancient this Galway countryside is in the vast geological scale of time itself.
While older stones (one nearly said âbonesâ) have been discovered in faraway Wexford and nearby Mayo, the great mountain heart of Connemara, the Twelve Bens, in the western section of County Galway, began to form nearly seven hundred million years ago, as far back as we would like to go.
MOVING PLATES
Back then, the slow moving plates of the earthâs crust re-created oceans and land masses in a confusing melody of change set in motion over a timescale of millions of years. The Atlantic Ocean had yet to form, and in its place an earlier ocean called Japetus separated what is now North America, which was then joined to the north-west portion of Europe, from the rest of Europe itself.
Ireland, of course, had to be different. Put simply, the northern half lay in the North American section, while that portion lying south of a line from the Shannon to Dundalk lay in Europe. Thus, the beginnings of Connemara lay in the former section, its sedimentary rock formation dating to the Dalradian of the late Cambrian period laid down during the formation of the Japetus Ocean. As ever, beneath the earthâs mantle the molten interior was restless and in time the basic rock called gabbro forced itself upwards forming a thick layer in the sedimentary foundations of this proto-Connemara. More gigantic changes were to follow.
The two continents were in motion, and slowly moving towards one another, the Japetus Ocean was squeezed dry by the new land formations, with the result that the Connemara rock foundations were folded and faulted as the continents collided. The two halves of Ireland were joined together and Connemara had found a permanent home about 450 million years ago as it slid into position over the volcanic rocks of Europe.
TWELVE BENS OF CONNEMARA
The metamorphic or changing effects on the basic rock formations of Connemara were immense. As well as the folding and faulting, a vast sandstone layer was metamorphosed into pure quartzite, clay into schists, and proto-limestones into the familiar green marble synonymous with Connemara today.
In time, a new moulder of the landscape comes into play. Years are now counted in the millions as weather spreads its relentless cloak of erosion to test these ancient rocklands. Sun, rain and ice are the main ingredients that carve their varied scripts on the Connemara landscape, as the softer schists weather away to lower elevations. Thus, the massive quartzite entity is left to thrust twelve massive elbows of grey, glittery peaks to meet the western skies. Called na Beanna Beola (the Twelve Bens), they are the flag-poles over the ancient heart of Connemara, with Binn BhĂĄn at 730 m, the highest and proudest of them all.
They are not alone, of course, because across the Inagh Valley with its dark-watered Inagh and Derryclare lakes, rises yet another quartzite range delighting to the name of the Maam Turk mountains. Although they are not as high as their Ben sisters, they, too, run roughly in an east-west direction, with Binn Idir an DĂĄ Log their highest point at 703 m, before the Maam Valley, where so much of the famous film, The Quiet Man, was shot in 1951, puts a halt to their eastward thrust.
METAMORPHIC CHANGES
Sufficient to say that the amazing mix of the quartzite peaks of the Bens and Turks right down to lake level, where green Connemara marble caresses the little hamlet of Recess, raises pulse rates among visiting geologists. Equally exciting are the endless glints of schists, while cloudy garnets near Cleggan and jasper outpourings along the shoreline at Lough Nafooey indicate the rich geological heritage of these western highlands of County Galway.
These semi-precious stones suggest much metamorphic and volcanic activity in the distant past, especially jasper, because more than one phase in the formation of this rock is evident on the Lough Nafooey landscape separating North Galway from South Mayo. While red jasper is found here, denoting a slower cooling of the lava on the earthâs surface at this point, clusters of the green variety also occur, evidence of a swifter underwater formation process when these lands were submerged underneath an ocean as primeval as time itself.
GALWAY GRANITE
Even now, we are not finished with the gigantic changes wrought by nature, because 400 million years ago the earth was restless again and intruded its volcanic anger, this time across the southern flanks of Connemara verging on Galway Bay. Consequently, the dotted mounds of ruddy outcrops contain the appropriately named Galway Granite, a stone much sought after in modern times in its finished and finely polished form of pillar, pedestal and memorial plaque. Happily, there is life still in this igneous rock, for its pleasing mix of feldspar, mica and quartz lends a delightful colour combination to the polishing process, and the end result can be seen in stout, rounded pillars of gleaming granite in a number of Galway City churches.
While one could delve much deeper into the major geological periods and processes associated with the shaping of these fascinating highlands, itâs time now to leave Connemara, a geologistâs paradise, and travelling eastwards across the vast, dividing waters of Lough Corrib, we find the county stretching for over 60 km more, its limestone base formed in geological slumber.
LIMESTONE FORMATION
Not here, the upheavals of spewing magma and crushing plates, but rising seas during the Carboniferous Period of 300 million years ago brought new geological changes still evident in this section of East Galway, twice as large again as its rugged western appendage.
As Ireland sank into a warm, shallow, marine environment, the land, now the sea floor, was colonised by marine animals and plants, whose decaying bodies produced the mineral calcium carbonate so prevalent in the grass-covered limestone plains of East Galway. Big-boned animals, known simply as Galway Sheep, are proof positive of the natural endowment of these grasslands, which took place aeons ago.
GLACIAL TIMES
In more recent times, if one can describe two million years ago in such a way, nature was angry yet again and sent glacial fingers to greet a land recovering from a watery grave. The last great Ice Age had arrived, and with it new moulding forces changed the Galway landscape in ways familiar to the modern eye, not least the creation of two vast limestone basins, later to overflow from incessant rains and form Lough Corrib.
The massive Inagh Valley, its mountain sides made smooth by a third glacial movement known as the Connemara Phase, and nearby Killary Harbour, Irelandâs only fjord, are other examples of Ice Age moulding in its final phases along fault lines already there. Here, one senses the powerful thrust of ancient glaciers when snow and frost mingled to form a mighty ice sheet, whose relentless grating movement towards the sea acted as a giant gouge or chisel that only nature could employ.
The residue scooped up by these glaciers, huge boulders of the aforementioned Galway Granite, were carried like confetti and deposited as erratics on the shorelines of Galway Bay or as underwater hazards in Lough Corrib. These immense boulders manifest the translating strength of the ancient ice flows, as do the great whales of sand and rolled pebbles that we know today as drumlins, rising high as grassy hillocks over bog and sea. Yet another contribution from the Gaelic language, the term originates in the word âdruimâ (a ridge), denoting a streamlined mound of glacial drift. A prime example is Gentian Hill, which dominates Silver Strand, one of Galway Cityâs famous seaside resorts on its western outskirts.
ESKERS
Inland, even more powerful glaciers created eskers, meandering ridges of sand and gravel formed by melt waters flowing as rivers beneath the ice sheets. Today, these high, sandy monuments to our glacial past vein eastern parts of County Galway in particular, with the more famous Eiscir Riada reaching its maritime destination near the water tower outside the village of Clarinbridge.
In the past, these eskers helped divide kingdoms, as did the Eiscir Riada when it divided Ireland into Leath Mogha and Leath Cuinn during Celtic times. Meanwhile, in the heart of the eastern section of County Galway, from Athenry to the famous Turoe Stone near Loughrea, use may have been made in Celtic times of these natural formations as defence features, but they had other potentials also.
Not generally noted was the fact that eskers were also ideal communication corridors set high above the canopy of endless forests, allowing a warring clan or humble saint alike to move more easily across the sea of green. In this regard the Eiscir Riada was also known as the SlĂ MĂłr (the Big Way), and despite some meanderings, one could depart from the seashore at Clarinbridge in these ancient times and travel with a little more facility to the east coast.
GORTIAN PERIOD
Yet even in this last great Ice Age, warm periods also occurred, and one in particular had a special Galway connection. Ancient sediments of over 50,000 years ago from the Gort area in South Galway best illustrate these changing climatic conditions. Here, pollen analyses record stunted plant growth giving way to the vibrant spread of ash, hazel and even oak, before grasses again herald the return of colder climes and the demise of these primeval woodlands. Consequently, this warm hiatus is called the Gortian Period and a small Galway town gives its name to an important period in Irish glacial history.
FAUNA
Fauna, too, appeared during these narrow warm bands, none more so than woolly mammoths and giant Irish deer with antlers to match. Red deer, wolves and even brown bears inhabited this emerging land also, but we have to wait until the actual ending of the last cold spell, some 12,000 years ago, before Ireland finally freed itself from retreating ice sheets.
As the landscape lost its white, silver hue, a welcome mat of green and blue awaited the arrival of man sometime after 8000 BC.
EARLY VEGETATION
Two thousand years before, a mixed tundra of rough grassland, heath and dwarf trees such as birch, fed by the new and warmer rains, gained a foothold on these emerging lands. The birch grew stronger and ever higher, competing now with hazel as the greening of Ireland began.
In time, giant forests of oak and pine greeted the first human arrivals, simple hunting and fishing folk who found perhaps more sustenance in the waters than the wild.
LAKE and RIVER FORMATION
Shellfish lay abundant by the seashores, while the emerging rivers were also kind. The estuaries were filled with mullet and bass, but the rivers were something else, and the River Corrib better than most. A short river of only 5 km, it helped shed the accumulating waters of its creator, Lough Corrib, only then slowly evolving into the largest lake in the Irish Republic. In time it would grow to 44,000 acres of clear blue water, filling first the great deep basin gouged or even faulted in earlier times between the angling centres of Oughterard and Headford.
The overflow moved south, at first as a small meandering river which began to fill another smaller, shallow basin below the present village of Annag...