Tag: Finger Lakes geology

Stones That Traveled: Glacial Erratics, Deep Time, and the Stories They Leave Behind

Glacial erratics are immigrant stones—carried south by ice, dropped without explanation, and left behind to challenge our sense of permanence, place, and deep time.

MichaelStephenWills22 Comments

There are rocks that merely sit where gravity has placed them, and then there are rocks that arrive with stories already embedded—foreign syllables carried south on ice, dropped without explanation, and left for us to puzzle over. Glacial erratics belong to the second category. They are migrants with no passports, refugees of deep time, whose presence quietly contradicts the landscape that hosts them.

Long before anyone reached for a hand lens or an ice-flow diagram, people answered such contradictions with imagination. In Ireland, a boulder perched just so on a mountain side is not a geologic problem but a resting place. Leprechauns, we are told, favor such stones—high enough to observe human intrusion, solid enough to outlast it. Skepticism, as folklore reminds us, is not always a stable position. Kevin Woods—better known as McCoillte—found that out the hard way when doubt collided with experience on the slopes of Slieve Foye. What followed was not merely a conversion story, but an act of modern mythmaking: folklore translated into bureaucracy, imagination petitioning regulation, and “The Last Leprechauns” entering the unlikely language of conservation. Stone, story, and belief hardened together into something oddly durable.

Rocks such as this are a favorite perch for leprechauns to rest and contemplate the works of man who have invaded their world. Inhabitants of Carlingford who wander Slieve Foye have come upon them often enough, their stories and certitude in the existence of the Little People are resistant to manifold doubters with their reasons and arguments. Kevin Woods, aka McCoillte, was a doubter until worked on a stone wall on property he owned on Ghan Road, Carlingford. His belief did not arise on the discovery of the leather purse, covered with ages of dust and lime, nor with the gold coins inside. McCoillte pocketed the coins for luck. As luck would have it, McCoillte loved to walk on Slieve Foye. It was on one such walk he and his dog encountered Little People who paralyzed them to escape. His unexplained absence led to troubles with the wife. This experience brought McCoillte around to enough of a belief that he, with lots of help, succeeded in petitioning the E.U. European Habitats directive to recognize leprechauns a protected species. A reserve was establish on Slieve Foye to protect the “Last Leprechauns” and you can google this phrase to learn more about McCoillte’s stories.

Back in the Finger Lakes, we tend to use a different grammar when confronted by an out-of-place rock. We name it, classify it, and trace its lineage northward. Erratics scattered across Tompkins County are geological sentences that begin somewhere else entirely. The bedrock beneath Ithaca—Devonian shale and sandstone—cannot account for crystalline intruders left behind like forgotten punctuation marks. These stones speak of ice sheets thick enough to erase valleys and decisive enough to transport mountains in fragments.

Some of those fragments have been domesticated. Cornell, for example, has never been shy about rearranging its stones. An unremarked erratic along the Allen Trail may once have been shrugged off as inconvenient rubble, while another—dragged from the Sixmile Creek valley—was carved into a seat and made eloquent. The Tarr memorial boulder, resting near McGraw Hall, transforms erratic stone into deliberate monument. It invites rest, contemplation, and perhaps gratitude for those who taught us how to read landscapes written by glaciers.

We find boulders of crystalline rock, commonly derived from Adirondack sources, left behind on the surface of ablation moraine, in the Finger Lakes Region. Cornell finds some and move them, maybe the case for this unremarked erratic found along the Allen Trail of FR Newman Arboretum. Another enormous erratic, brought in from the Sixmile Creek valley, was carved into a seat as a memorial to Professor R.S. Tarr who deciphered much of the glacial history of the Finger Lakes Region. Find it at the southwest corner of McCraw Hall on the Cornell University Campus. Reference: “The Finger Lakes Region: Its Origin and Nature,” O.D. von Engeln, Cornell University Press, 1961 page 106

Glacial Erratic, Fillmore Glen

Elsewhere, erratics remain defiantly themselves. In winter, one along Fall Creek alternates between anonymity and revelation, depending on whether snow smooths its surface or retreats to expose lichen constellations. Bridges pass overhead, traffic flows, semesters turn over, yet the rock remains unimpressed. It has already endured pressure sufficient to rearrange its crystals; a passing academic calendar is not likely to trouble it.

Glacial erratic with and without a snow covver and spotted by lichen along Fall Creek in a winter afternoon as seen from Cornell Botanic Gardens. That is the bridge over Fall Creek on Forest Home Drive. Cornell University, Ithaca, Tompkins County, New York State

Closeup of the same boulder

This boulder, a glacial erratic, was found near Fall Creek and the Cornell Botanic Gardens Horticulture Building. Cornell University, Ithaca, Tompkins County, New York State

This rock, a glacial erratic, was found near Fall Creek and the Cornell Botanic Gardens Horticulture Building. Cornell University, Ithaca, Tompkins County, New York State

Then there are the stones that confront us most directly—those we stumble upon in fields, pulled from soil by plow or frost, demanding explanation. A white, iron-stained marble boulder in a Tompkins County field is not subtle about its foreignness. It does not belong to the local vocabulary of shale and sandstone. Its pale surface, crystalline texture, and mineral scars point insistently north, toward the Grenville terrane of the Adirondack Lowlands. The Balmat–Edwards–Gouverneur marble belt offers the most persuasive origin story: metamorphosed carbonate rock carried south by Laurentide ice, released when climate and physics finally lost patience with one another.

I found this white marble erratic in a Tompkins County field. The highest-probability source is Grenville marble from the NW Adirondack Lowlands / St. Lawrence County (Gouverneur/Balmat–Edwards marble belt), delivered by southward-flowing Laurentide ice. I say the most probable source is metamorphosed carbonate (marble) from the Grenville terrane to the north—especially the northwest Adirondack Lowlands / St. Lawrence County marble belt (the “Gouverneur Marble” and related Grenville marbles), transported south by the last Laurentide ice sheet. Why that’s the best bet: Ice-flow geometry favors a northern source. In the Finger Lakes, glacial ice advanced with a flow direction that was very close to due south, guided by the north–south bedrock valleys. Tompkins County erratics are “exotic” imports. Local bedrock around Ithaca/Tompkins is Devonian shale/sandstone, but the region contains many nonlocal (“exotic”) glacial erratics carried in from much farther north (including southern Canada and beyond). Marble isn’t local to the Ithaca area, but it is abundant in the NW Adirondack Lowlands. The Balmat–Edwards/Gouverneur area in St. Lawrence County is a classic Grenville Lowlands district with marble belts (the same province that yields cream/white building marble around Gouverneur).

What makes this particular erratic compelling is not just its provenance, but the improbability of its journey. Ice moved with purpose here, flowing south along bedrock valleys like Fall Creek and Cayuga troughs, turning the Finger Lakes region into a conveyor belt for distant geology. When the ice melted, it left behind evidence that refuses to blend in. Erratics are geological truth-tellers. They announce that this place was once unrecognizable, that what seems permanent is merely provisional.

Perhaps that is why folklore clings so naturally to stone. Whether leprechauns or Laurentide ice are credited, erratics insist on a larger frame of reference. They ask us to imagine landscapes in motion and beliefs under revision. A boulder can be a seat, a marker, a perch, or a puzzle—but never merely background. It waits, quietly confident, for us to catch up to its story.

Enter your email to receive notification of future postings. I will not sell or share your email address.

Where Fall Creek Turns: An Esker’s Quiet Authority in Malloryville Preserve, New York

An ancient esker redirects Fall Creek at Malloryville Preserve, revealing how Ice Age meltwater shaped the land and still quietly governs water and wandering feet.

MichaelStephenWills16 Comments

The esker rises like a glacier’s spine, a long-backed remnant left behind where an ice mountain learned how to leave quietly. It is not loud geology—no cliffs shouting their age, no cataracts announcing force—but a patient, sinuous fact. A frozen river’s footprint, pressed into the land and then abandoned, it lies there still, grading itself gently on both sides, as if unwilling to offend gravity or time.

At first glance, it could pass for a human thing: a railroad berm, a raised roadbed, an engineer’s solution. Yet this ice-scribe ridge was shaped without blueprints, drafted by meltwater racing beneath a retreating glacier, carrying gravel like a hoard of stories. The stones settled where the ice allowed them, stacked by pressure and patience, forming a ridge long enough—nine-tenths of a mile—to tell a stream where it must turn.

Fall Creek meanders through the esker fields of the Malloryville Preserve. Here is the view from an abandoned railroad bridge. The preserve is near Freeville in the Finger Lakes Region of New York State.

Fall Creek arrives with purpose, confident in its descent, until it meets the esker and must reconsider. Here the water performs bows, an abrupt acknowledgment of authority. The creek becomes a liquid negotiator, redirected by the ridge’s quiet insistence. This is the esker’s work: not domination, but persuasion. Land teaching water a new sentence.

This video provides a better feeling for the esker. To do this from WordPress Reader, you need to first click the title of this post to open a new page.

Standing at the foot of the esker, the slope to the right reveals itself slowly. It does not announce, I am important. Instead, it waits to be noticed. A swamp settles nearby, the water-mirror lowland, collecting what seeps and lingers. Together, ridge and wetland form a conversation: height and hollow, drain and gather, spine and lung.

Before there was signage, before placards translated glacial grammar into public language, the land already knew itself. Knowledge preceded explanation. My son and I pitched a tent atop a kame at our front door — another ice-left hill, a deposit of ancient momentum. That night, the ground beneath us was older than memory and younger than myth. Camping there was not recreation so much as apprenticeship.

A kame is a meltwater’s knuckle, rounded and abrupt, shaped by collapse rather than flow. To sleep upon it is to rest on uncertainty made solid. The tent fabric whispered in the breeze, a thin membrane between human breath and glacial aftermath. Fireflies stitched brief constellations above the grass, while the earth held fast, remembering ice that no longer needed remembering.

Walking along Fall Creek later, watching it turn west where the kame insists upon geometry, one begins to sense the land’s authorship. This is not random scenery. It is edited terrain. Each ridge, each bend, each saturated hollow is a sentence left behind by ice that once covered everything and then, mercifully, withdrew.

The esker itself is a time-ladder, inviting slow ascent. Step by step, gravel shifts underfoot—rounded stones, carried far from their origins, now loyal to this place. Each stone is a traveler without a passport, naturalized by pressure and pause. Together they hold their line, resisting erosion not by hardness alone, but by collective agreement.

From above, the ridge reveals its length, its deliberate curve. It does not hurry. It does not apologize. It simply is, a memory ridge, reminding the present that absence can be as powerful as presence. The glacier is gone, yet its handwriting remains legible.

Overflow from a Kettle Pond threads through a meadow before feeding Fall Creek. The O.D.von Engeln Preserve at Malloryville.

In the nearby swamp, water pools in dark reflection. Frogs tune their throats. Sedges write vertical poetry. This is the after-ice sanctuary, where meltwater’s descendants linger and life reclaims the margins. The esker drains; the swamp receives. Between them flows a balance older than names.

To walk here is to practice a different kind of attention. The land does not reward speed. It rewards listening. The ridge asks you to follow its curve, to feel how it shapes movement, how it choreographs water, wildlife, and wandering humans alike. It is a path-without-intention, yet it guides all who encounter it.

Long after the tent is folded, after the creek continues its bent course, after the placards fade and are replaced, the esker will remain. It will continue directing water, lifting footsteps, and teaching geometry to anyone willing to notice.

Eskers and kames are the glacier’s farewell letter, written in gravel, signed by time, and left open for reading.

Click Me for the first post of this series.

Enter your email to receive notification of future postings. I will not sell or share your email address.

Exploring Malloryville Preserve: A Hidden Glacial Wetland Gem in New York’s Finger Lakes

Explore the O.D. von Engeln Preserve at Malloryville, a hidden Finger Lakes wetland where glacial eskers, kettles, and springs reveal the deep story of ice and water.

MichaelStephenWills20 Comments

In the heart of upstate New York, the Finger Lakes region stretches out like a handprint left by the last great ice sheets—long, narrow lakes aligned north to south, their steep-sided valleys feeding into a lattice of creeks, waterfalls, and wetlands. It is a landscape defined by water and time: glaciers grinding south, then melting back north some 12,000 years ago, carving deep troughs, piling up ridges of gravel and sand, and leaving behind a terrain that is anything but simple.

The O.D. von Engeln Preserve at Malloryville, near the small village of Freeville, is one of the quiet places where that story is written most clearly on the land. It doesn’t shout like Taughannock Falls or Ithaca’s famous gorges. Instead, it whispers—through the curves of its hills, the softness of its ground, the unexpected appearance of a spring at the base of a gravel ridge. Here, in a relatively compact area, you can see how ice and water worked together to shape the Finger Lakes region we know today.

Overflow from a Kettle Pond threads through a meadow before feeding Fall Creek. The O.D.von Engeln Preserve at Malloryville.

By the time the preserve officially opened in 1997, the name O.D. von Engeln was already familiar to anyone curious about local geology. His classic book on the Finger Lakes helped generations of readers understand that the scenery around them was not random, but the result of powerful, understandable processes. Reading von Engeln, the rolling hills and quiet valleys near Freeville become more than background—they become evidence: of buried ice, rushing meltwater, and the slow settling of sediments into the forms we walk on now.

Malloryville is an outdoor classroom for that lesson. The preserve is built around a cluster of glacial landforms—eskers, kames, and kettles—that create a three-dimensional mosaic of ridges and hollows. Eskers, those long, winding gravel ridges left by rivers that once flowed inside the glacier, snake through the forest like frozen currents of stone. Kames—steep, irregular hills of sand and gravel—rise suddenly from the surrounding lowlands. Kettles, the depressions left behind when buried ice blocks melted away, now cradle wetlands and pools.

Beneath and between these features, groundwater is constantly on the move. It seeps through layers of sand and gravel, emerges as cold springs at the foot of slopes, and spreads out into swamps, fens, and marshes. In the Finger Lakes, water is always telling a story; at Malloryville, it’s simply easier to hear. Follow the trail and you move through a succession of wet worlds: a seep-fed fen with delicate mosses and sedges, a shrub swamp where skunk cabbage thrusts up in early spring, a cattail marsh that hums with birds and insects in summer.

For my family, the story of Malloryville began even before the preserve had a name. We lived nearby along Fall Creek, itself a thread in the larger fabric of the Cayuga Lake watershed. My son and I camped for the first time on top of an esker just beyond our front door, our tent perched on what I would later learn was the remnant of a stream that once tunneled through the base of a glacier. At the time, it was simply a magical narrow ridge in the woods. Only later, with von Engeln’s guidance and the preserve’s interpretive signs, did that ridge become a sentence in a much older, longer narrative.

That is one of the great gifts of the Finger Lakes: the chance to move from simple admiration—“this is beautiful”—to understanding—“this is how it came to be.” The steep slopes along Cayuga, Seneca, or Skaneateles; the drumlin fields near the north ends of the lakes; the hanging valleys and waterfalls; and the quiet wetlands of places like Malloryville are all chapters in the same glacial chronicle. Once you learn to read one place, you begin to read them all.

Walking into the O.D. von Engeln Preserve, you enter that story at a small, intimate scale. The parking area and trailhead give way quickly to a world where the ground feels different—sometimes firm and gravelly, sometimes soft and yielding underfoot. Wooden walkways and narrow paths thread through shady forest and open wetland. Each bend offers a subtle shift: a new plant community, a change in water clarity or flow, a small sign explaining what lies beneath your feet.

Fall Creek meanders through the esker fields of the Malloryville Preserve. Here is the view from an abandoned railroad bridge. The preserve is near Freeville in the Finger Lakes Region of New York State.

This is not grand scenery in the postcard sense; it is something quieter and deeper. Malloryville invites you to slow down and notice. To ask why a particular ridge is so narrow, why water emerges here but not there, why one hollow is filled with shrubs and another with moss and sedge. In learning those answers, you gain not only an appreciation for this modest preserve but also a richer understanding of the entire Finger Lakes region.

The Trout Lily (Erythronium americanum) is named for the mottled brown leaves resembling marking on trout.

In the end, the O.D. von Engeln Preserve at Malloryville is a lens—a way of seeing. Through it, the familiar landscapes of central New York—valleys, hills, streams, and lakes—come into sharper focus as the lasting work of ice and water. Stand on an esker, look across a kettle wetland, listen to the quiet trickle of a spring, and you are standing inside the very processes that shaped the Finger Lakes.

Enter your email to receive notification of future postings. I will not sell or share your email address.

On The Edge of Time Above Taughannock Gorge

Perched above Taughannock Gorge, a moss-covered ledge and cascading falls reveal ancient stories—where Devonian seas once flowed and time’s layers whisper through stone and water.

MichaelStephenWills5 Comments

The morning sun had only just breached the rim of the gorge, sending long slants of golden light across the forest floor. Walking the South Rim Trail of Taughannock Falls State Park, I came upon a quiet, unassuming spot—just a few paces off the path—where the forest seemed to pause in reverence. What greeted me was a small marvel of persistence and time.

There, rooted precariously atop a slab of brittle shale, was a tenacious shrub rising from a bed of moss, its spindly frame etched in sharp contrast to the soft, green sprawl beneath it. The moss had taken hold on a shelf of rock cantilevered over the gorge like a green tongue of earth defying gravity. Cracks traced the shale’s surface like veins, silent records of the forces that shaped this place—heat, ice, pressure, time. Together, the moss and the bush formed an improbable community, surviving against odds, bound together by the thin soil cradled in stone.

This ledge, suspended over the abyss, seemed less a part of the earth than a question it asked—how much life can cling to the edge before the edge itself gives way?

Beneath this living fragment, the gorge dropped away. Layers upon layers of shale revealed themselves, stacked like a collapsed library of time. Here, the Devonian Period lies exposed to wind and rain, and to those willing to pause and wonder. Each stratum holds the fossil whisper of ancient seas, where trilobites scuttled and coral reefs once stood. This gorge was not carved quickly. It was not born of a moment, but of many—countless raindrops, millennia of ice melt, the slow, sure work of water over stone.

From this natural balcony, I looked out and down to the gorge floor where the creek shaped the land with an artist’s patient hand. The falls, seen from above, no longer thundered—they danced. Spread like the folds of a fan, water curled over smooth stone in steps of white silk. From here, the cascade looked deliberate, choreographed—an elemental performance halfway between gravity and grace.

How many times had this water flowed, reshaped, receded? How often had it carved these grooves, smoothed those ridges, erased the footprints of what came before? Looking at the exposed rock, one could trace the signature of ancient glaciers, feel the memory of long-gone floods. It was humbling—this intersection of change and continuity.

Above it all, the trees stood still. Pine and oak, rooted well back from the edge, offered a kind of sentinel presence. Their shadows stretched long and angled, tracing the contours of both earth and memory. For a moment, I let go of all thought and simply listened—to the murmur of wind through leaves, the faint rush of water far below, and the silence that presses in when the land itself seems to be remembering.

This spot—so easily missed by a hurried hiker—offered a parable of resilience and impermanence. The moss did not grow with certainty, nor the shrub reach with confidence. They survived on the edge because they adapted. They made do with less. They took root where others could not. There was no security in that place, only presence. Only the now.

And isn’t that a lesson worth carrying?

We so often seek stability, firm ground, a clear path. Yet, some of the most beautiful things live just beyond comfort—on ledges, in cracks, in the margins of the known. To pause here was to acknowledge that life thrives not only in sheltered valleys but also at the edge of what seems possible.

As I stepped back onto the trail and continued along the South Rim, the image of that mossy outcrop stayed with me. I carried it in my thoughts like a talisman—proof that even on the brink, life finds a way. And that from above, the most chaotic falls can appear as ordered motion, as a flow toward something larger.

Later, when the sun climbed higher and the light lost its slant, I would look back on this moment not as a spectacular highlight but as something more intimate: a quiet encounter with nature’s subtle artistry, its layered truths, and its enduring invitation to look closely, feel deeply, and walk softly.

For here, above the gorge, at the edge of earth and time, even a whisper leaves a mark.

Enter your email to receive notification of future postings. I will not sell or share your email address.