Vast Lost Continent Discovered Beneath the US

Appalachian Mountains. Credit: J Guth / Wikimedia Commons / CC BY-SA 3.0

A immense fragment of a mislaid continent lies buried beneath the eastbound US, stretching on the Appalachian Mountains from Maine to Georgia, according to caller research.

Scientists accidental the operation formed astir 200 cardinal years agone during the breakup of the supercontinent Pangaea. Intense volcanic enactment created caller crust, which was aboriginal buried nether sediments from eroding mountains. Researchers picture it arsenic portion of a “lost continent” that nary longer exists astatine the surface.

Mapping a hidden continent

The feature, known arsenic the Piedmont Resistor, was identified utilizing information from the Magnetotelluric (MT) Array. The task utilized astir 1,800 impermanent stations crossed the state to measurement however heavy rocks behaviour electricity.

The research, published successful Reviews of Geophysics, marks the completion of a two-decade effort. The task began wrong the U.S. Array, funded by the National Science Foundation.

Unlike seismic surveys, which way stone density, MT methods observe electrical signals heavy underground. These signals are influenced by earthy changes successful Earth’s magnetic field, allowing scientists to representation structures acold beneath the surface.

Revealing however the continent formed

The 3D images connection a elaborate presumption of North America’s hidden structure. They amusement h2o being pulled into the Cascadia Subduction Zone, wherever oceanic crust sinks beneath the continent.

The information besides uncover stretching successful Nevada’s Basin and Range Province and amusement however Utah’s Wasatch Mountains bounds that movement.

In the cardinal United States, researchers mapped buried upland belts beneath the Great Plains and identified boundaries betwixt past crustal blocks. Farther east, those boundaries are little clear. Paul Bedrosian said this suggests the portion formed from a premix of continental fragments and volcanic land chains.

A buried relic with modern risks

The Piedmont Resistor stands retired arsenic a cardinal remnant of this mislaid continent. It was not detected successful earlier seismic studies. Researchers judge it formed during volcanic eruptions tied to the breakup of Pangaea. Alexander Grayver said the uncovering is accordant with known geological processes.

A mislaid continent fragment is hiding beneath the eastbound United States.

Scientists person uncovered a monolithic buried crust stretching from Maine to Georgia—formed during the breakup of Pangaea 200 cardinal years ago. pic.twitter.com/uRxOiR6pUb

— Tom Marvolo Riddle (@tom_riddle2025) May 5, 2026

The operation besides affects modern infrastructure. During star storms, disturbances successful Earth’s magnetic tract tin make electrical currents successful the ground. The dense rocks of the Piedmont Resistor defy these currents, pushing them into shallower layers person to powerfulness systems.

Anna Kelbert said geological conditions tin amplify these risks by up to 1,000 times. She warned that galore utilities inactive trust connected outdated hazard data.

Implications for resources and research

The findings whitethorn assistance usher the hunt for captious minerals. Graham Heinson said deposits often signifier adjacent past magmatic systems that MT information tin trace.

Despite its scale, the task outgo astir $20 million. Adam Schultz said the results present precocious worth for the investment.

Researchers accidental the MT Array sets a planetary modular for imaging Earth’s interior. It besides reveals however fragments of a mislaid continent inactive signifier the onshore and risks seen today.