The Land Itself

First light on the summit of Mount Mitchill. The wind off the Atlantic hits the ridge first; behind you, the Navesink River is still holding its overnight quiet. Between the two, a peninsula of pale sand runs six miles north to the mouth of New York Harbor and stops at the harbor's throat. Across the water: Coney Island, the Rockaways, the lights still on.

The peninsula is Sandy Hook. The ridge under your boots is the Navesink Highlands. They are two of the strangest pieces of ground on this coast, they sit twenty minutes apart, and they have almost nothing to do with each other.

The ridge is a Cretaceous sea floor left standing above the water — seventy million years old, and going nowhere. The Hook is a sea floor being built right now, out of sand that waves have dragged up the shore from somewhere else entirely, and it is still growing at a rate you can measure against a lighthouse. One is stranded. One is in motion. The temptation is to make the first the source of the second, and it isn't.

266 feet. That is Mount Mitchill's summit above mean sea level — the highest natural ground on the Atlantic seaboard between southern Maine and the Yucatán Peninsula. The superlative is a seaboard claim; further inland in Monmouth County, Crawford Hill stands higher at 391 feet, and the two figures are kept distinct. The hill carries the name of Samuel Latham Mitchill, the naturalist and senator who was among the first to write about the Navesink Highlands as a distinct geological feature. The height is why ships have found this coast for four hundred years. It is why the Dutch and the English and the French mapped the Highlands before they mapped almost anything else on this shore. It is why the U.S. Army built Fort Hancock at the foot of it. It is why the National Park Service watches it now.

Everything else in this chapter is downstream of the ridge and the sand.

Pick up a chunk of the bluff at the base of the Highlands and hold it against the light. Green-black. Soft. A coin will scratch it. This is the Navesink Formation — glauconite-rich marl, "greensand" to a working geologist, laid down on a shallow sea floor in the late Cretaceous, roughly 70 to 66 million years ago. The rock is packed with the fossil remains of animals that lived when this ground was ocean and the ocean was tropical.

The formation records the final chapter of the age of dinosaurs. That is not a poetic gesture. Belemnite guards, oyster shells, scaphopods, ammonites, and the occasional mosasaur tooth turn up in the marl — a careful walker at low tide can pick them out of the beach cobble at the base of the Highlands bluff. The bed dates from the Maastrichtian, the last stage of the Cretaceous. Which is to say the very last million years or two before the impact event that ended the non-avian dinosaur world. The Highlands ridge is the last coherent piece of that ocean floor still holding above sea level at the New York bight.

One boundary carefully. The Highlands greensand is Maastrichtian, so it predates the K-Pg extinction boundary; the boundary itself is placed in New Jersey stratigraphy in the Hornerstown Formation that lies above the Navesink, and the boundary interval is studied inland at sites such as the Rowan University Fossil Park in Mantua Township and the Inversand pit before it. Do not read this ridge as "the day the dinosaurs died." Read it as "the last million years before."

If picking up a 70-million-year-old belemnite guard sounds like a good weekend, two places in Monmouth County do it well. Big Brook Preserve in Marlboro, in the Monmouth County Park System. Poricy Brook Fossil Beds in Middletown Township, at Poricy Park. Both public. Both with parking. Both within a half-hour of the bluff.

Below the harbor there is a river no one sees. A bathymetric chart draws it out clearly — a channel running east from the mouth of the Hudson, across the continental shelf, cutting off the outer edge, dropping into the deep water beyond.^[1] The channel is not modern. It is a fossil river.

At the peak of the last glaciation the continental shelf in front of the ice stood dry, and the Hudson ran out across it. It carried meltwater from the retreating ice over the exposed shelf and spilled it into the ancestral Atlantic through a channel it had cut for itself. That channel is the Hudson Shelf Valley. It runs from Sandy Hook to the Hudson Canyon and drops off the shelf edge.

When the ice retreated and sea level rose, the channel drowned. What the maps call New York Harbor is that drowning: the ancestral Hudson's valley with the modern harbor sitting at its head. The Hook stands at the seaward end. Which is why the harbor is a harbor. Which is why ships have been arriving here since Verrazzano's Dauphine in April 1524.

Walk the tide line at Sandy Hook and you can see it: a low, steady drift of sand along the wet edge, moving north. That drift is the engine. Waves arrive on the New Jersey shore at an angle, and every one of them pushes sand a little further up the coast. That is longshore drift, and it runs north continuously — day and night, year over year — carrying sand from the Cretaceous marls and later formations of the Coastal Plain. It bypasses the resort towns. It bypasses the base of the Highlands ridge. It drops its load at the north tip of the Hook. A spit builds where a coastline changes direction and the drift carries on into open water. The Highlands is not what stops it; the end of the mainland is.

The Hook itself is a recurved sand spit — the working name for what the current has built. The tip advances at roughly 3 feet per year on average, which hides a lot of local variation and a lot of storm work, but the multi-century trend is real and measurable.

The measuring rod for the whole story is the Sandy Hook Lighthouse, built in 1764 by New York merchants — the oldest continuously operating lighthouse in the United States.Sandy Hook Lighthouse1764 When it was lit for the first time on June 11, 1764, it stood roughly 500 feet from the tip. By its centennial in 1864 the tip had grown three-quarters of a mile past the light. Today the tip stands a mile and a half past the light. The lighthouse has not moved. Everything on the map north of it has grown, one grain of sand at a time, over the past 260 years.^[2]

The first instrumental measurement of the tip landed on paper in 1845, when the U.S. Coast Survey drew Sandy Hook for the first federal chart of the New York Harbor approaches.Map of New-York Bay and Harbor and the Environs, 1844–18451844 Every subsequent edition — 1893, mid-century, today — has redrawn the peninsula a little further north. The tip walks.

Growth at the north end does more than add sand. It redirects rivers. The Navesink and the Shrewsbury both once emptied directly into the Atlantic through the southern base of the Hook. The lengthening spit walled them off. Today they flow north inside the Hook and meet Sandy Hook Bay near Highlands. They flow the way they flow because the sand has said so.

It is tempting to close the loop here — to say the sand on the beach is the bluff at the base of the ridge, ground down and put back into motion. It isn't. The greensand is a glauconite marl; it weathers to clay and iron oxide rather than to quartz beach sand, and the drift that builds the spit runs north through the surf zone, offshore of the barrier, without ever touching the Highlands. The two landforms sit twenty minutes apart and are, geologically, strangers.

The one real connection is smaller and quieter. The Navesink and the Shrewsbury drain the Highlands, and both estuaries feed sediment into the system behind the spit. Some of the ridge does end up out there. Not most of it, and not the beach.

Deep time is not the pace of a human paragraph. What follows is a much shorter clock. Human life on this coast begins in the millennia after the last ice retreated and continues today.

The Navesink Highlands and Sandy Hook are the ancestral homeland of the Navesink band of the Lenape, an Algonquian-speaking nation of the mid-Atlantic. Lenape communities lived along the bayshore, the ridges, and the peninsula for thousands of years before the first sail was recorded off this coast. Lenape nations continue to exist today. The Sand Hill Indian Historical Society^[3] in Monmouth County is the community-authored source closest to this ground. The Nanticoke Lenni-Lenape Nation of New Jersey^[4] and the Ramapough Lenape Nation^[5] are Lenape nations elsewhere in New Jersey whose published materials inform the wider picture. Written with, not about.

The 1524 landfall. April 1524. Giovanni da Verrazzano in La Dauphine becomes the first European to describe this coast. His letter to François I of France — the earliest surviving European written record of what would later be named Sandy Hook — notes the bluff and the spit as geographic features. It does not name the Navesink themselves.

That silence is the first act of the colonial record.

The 1609 encounter. Eighty-five years later, September 1609. Henry Hudson's Halve Maen anchors in Sandy Hook Bay under charter to the Dutch East India Company. Robert Juet's shipboard journal supplies the first English-language description of the coast and of the Navesink people who came out to meet the ship. The crew traded with the Navesink. On September 6, 1609, one of them — John Colman — was killed in a skirmish and by tradition buried on the Hook. His grave, if it exists, has not been found.

The 1664 deed. The English took New Netherland in 1664. Later that year, colonial documents record a deed transferring the Navesink Highlands and Sandy Hook tract from Navesink sachems — Popamora among them — to English settlers. What the deed says the English understood themselves to have purchased is one thing. What the Navesink understood the transaction to be is not a question a colonial deed can answer. This project reports the deed and says so.

The chain. From the 1664 deed forward, the colonial record moves in a spare sequence: Popamora et al. → subsequent transfers → Richard Hartshorne's acquisitions in the Highlands and Sandy Hook, largely completed by the late 1670s. By 1678 Hartshorne holds most of what became Middletown Township. By 1806 his heirs will convey much of Sandy Hook to the federal government — a story for a later chapter. The chain of custody is a colonial construct laid over a Lenape presence that preceded it by millennia. Popamora Point in Highlands still carries the name.

We have not written this in partnership with Lenape descendant historians, and we are not going to imply otherwise. That means the sections about Navesink life here rest on published archaeology and on documents written by Europeans, with all the limits that carries.

If you know this material — through study, through family, through the Lenape communities whose history this is — and we have gotten something wrong, or flattened something that deserved better, we want to hear it. Corrections are credited and the chapter gets revised.

The Navesink descendant communities named above are the people to consult for the fuller story of what the ridge and the spit have meant, and continue to mean, to Lenape families. Read this as a beginning, not the last word.

Walk the North Beach access path at Sandy Hook and you enter a maritime holly forest — an Ilex opaca stand at the north end of the peninsula, one of the finest examples of the community type on the Atlantic seaboard. Individual trees exceed a century and a half in age. Some exceed two centuries. The stand as a stand has been documented on the site for well over a hundred years.

The forest is intact for the same reason so much of the Hook's ecology is intact: the peninsula was closed to the public for a century. The Army opened the Sandy Hook Proving Ground in 1874 and tested ordnance there for the next two decades. In 1895 the post was designated Fort Hancock. The Army held the peninsula until December 1974, when Fort Hancock closed. Gateway National Recreation Area had been authorized in 1972; the transition placed the Hook inside the park. In the same century that comparable maritime hollies elsewhere on the Jersey Shore were cleared for hotels and cottages, the Sandy Hook stand sat inside a fence. The forest survives because the twentieth century did not touch it.

The ecology of the peninsula is not only the holly forest. It is a Cape May cedar swamp on the wetter interior. It is the osprey pole at the north tip and the horseshoe crab spawning beaches on the bay side. It is the herring gulls, the least terns, the piping plovers. It is one of the more important songbird migration corridors on the eastern seaboard — the peninsula lies directly under the Atlantic flyway, and the holly stand acts as first landfall for birds crossing north after long overwater flights. First landfall. Same as it was for the ships.

Sandy Hook is a young feature. A seventy-million-year-old ridge is not. The spit works on a clock a century wide. The coast that made the spit possible works on a clock twenty thousand years wide.

20,000 years ago, the Laurentide Ice Sheet — the great continental ice mass that covered most of Canada and the northern United States — stopped at what is now the north shore of Long Island and Staten Island. Sandy Hook did not lie under the ice. It lay in front of it, at the edge of an exposed continental shelf. Sea level stood approximately 120 meters — about 400 feet — lower than today. The coastline ran roughly 80 miles east of the modern shoreline. What is now the Highlands ridge sat inland from a much broader coastal plain.

From the last glacial maximum through the mid-Holocene — roughly 20,000 to 6,000 years ago — sea level rose by about 120 meters as the ice retreated and meltwater returned to the ocean.^[6] The rate slowed markedly around 6,000 years ago and has been comparatively modest since. The modern shoreline configuration — the drowned river mouth of New York Harbor, the position of Sandy Hook as a spit, the relationship of the ridge to the water — is essentially a Holocene feature.

It is younger than the pyramids.

On a piling at Sandy Hook, since 1932, a tide gauge has continuously recorded the height of the water. It belongs to what was the U.S. Coast and Geodetic Survey and is now NOAA (station 8531680). The record is one of the longer instrumental records on the American Atlantic coast, and the primary reference for sea-level trends in the New York Bight.^[7]

Fit a least-squares line to every monthly mean from 1932 forward and it slopes up at 4.12 millimeters per year, give or take 0.20 at 95% confidence. Roughly a foot and a third per century. Meaningfully higher than the global mean — regional subsidence in the New York Bight combined with Gulf Stream and North Atlantic circulation dynamics. The chart below the section shows the record itself; the trend line runs through the middle of it.^[7]

On October 29, 2012, Hurricane Sandy came ashore in southern New Jersey. October 2012 stands as the highest monthly mean in the Sandy Hook station's record. The USGS post-storm documentation for New Jersey — published as USGS Scientific Investigations Report 2016–5085, Suro, Deetz, and Hearn, Documentation and Hydrologic Analysis of Hurricane Sandy in New Jersey, October 29–30, 2012 — maps the surge extent across the state, including the flooded inland footprint at Highlands. The report is public and open-access.^[8]

The instrument on the pier is the modern eye that watches the same water Verrazzano and Hudson watched — the same water the Navesink watched before either of them. The ridge made the coast a landmark. The drowned river made the harbor. The waves made the spit. The ice sheet at the last glacial maximum drew the outer boundary that made the shoreline what it is. The Lenape lived here, and live here, through all of it. One sea floor stopped, and another one started, and they did it side by side without reference to each other. The story that follows is what happened on top of both.

People have been arriving ever since.