On the banks of the Taunton River at Berkley, Massachusetts, stands a small museum with a single, massive exhibit: a 40-ton boulder that was fished out of the riverbed and installed indoors in 1963. It is Dighton Rock, named for the town of Dighton, of which Berkley was once a part. The rock’s fame lies in the inscriptions carved on its face — lines, geometric shapes, schematic drawings of people, and writing, “both verified and not” — that have puzzled scholars since the 17th century.
The rock is a single block of grey-brown crystalline sandstone, roughly 5 feet high, 9.5 feet wide and 11 feet long: a slanted, six-sided block whose carved face is a trapezoid tilted at about 70 degrees toward the north-west. It sat in the riverbed, submerged except at low tide until it was raised. Tidal water wore the face for centuries, and the carvings were already badly faded when the first colonists recorded them. That damage is the heart of the mystery: nobody can say with confidence which lines are ancient, which are recent, and what the carvers meant.
Three and a Half Centuries of Drawings
The English first recorded the rock in 1680, when the Reverend John Danforth made a drawing of the petroglyphs in October of that year. His drawing survives among the manuscripts of the British Museum. Danforth believed the carvings depicted a ship battling with Native people — a tale he had heard from local tribes. In 1690, the Reverend Cotton Mather described the rock in his book The Wonderful Works of God Commemorated.
The most important copy came from Stephen Sewall, a Harvard professor who visited the rock in 1768 and made a large tracing on brown paper, displayed in Harvard’s Philosophy Chamber. For many who never stood on the riverbank, Sewall’s sheet was Dighton Rock. It is now held by Harvard’s Peabody Museum of Archaeology and Ethnology.
The trouble is that the drawings disagree with each other and with the rock as it looks today. Sewall in 1768 and Kendall in 1807 made definite statements that the greater part of the lines were so much effaced as to make their decipherment impossible, or wholly subject to fancy. Every drawing records a slightly different rock, because the rock itself kept changing — worn by the tide, painted and handled for centuries, and probably added to by later visitors. The poet and critic James Russell Lowell, exasperated by the whole affair, suggested that presidential candidates’ letters to newspapers should be written in the rock’s undeciphered script.
Phoenicians, Norsemen and a Portuguese Captain
The first full translation came from France. Antoine Court de Gébelin, working from Sewall’s 1768 drawing, published the eighth volume of his Le Monde Primitif in 1781 and argued that the carving was Phoenician. Yale’s president Ezra Stiles proposed the same origin in 1783. During a New England tour in 1789, Stiles concluded the markings looked Native American, similar to others he had seen in Virginia — a reversal that has been largely forgotten.
In 1837 the Danish scholar Carl Christian Rafn argued that the inscriptions were Norse. He claimed to read the words “Thorfinn and his 151 companions took possession of this land.” From 1837 onwards, the Viking theory of the rock was widely accepted, and Dighton Rock formed the last link in a chain of evidence for pre-Columbian Norse exploration. In 1916, Edmund B. Delabarre of Brown University shredded it: he found gross discrepancies between the Rhode Island Historical Society’s actual drawings and the doctored-up copies reproduced in Rafn’s book. Archaeologists such as T. D. Kendrick and Kenneth Feder later rejected the Norse theory outright.
Delabarre then offered a theory of his own. In 1912 he proposed that the carvings were Portuguese. Studying flashlight photographs — including one he took at 3 a.m. on 17 July 1920 — he found what he read as the date 1511, the name Miguel Corte-Real, and abbreviated Latin words he expanded to: “I, Miguel Corte-Real, 1511. In this place, by the will of God, I became a chief of the Indians.” Miguel Corte-Real was a Portuguese explorer who had set out from Lisbon in 1502 in search of his brother Gaspar, lost two years earlier near Newfoundland. Delabarre speculated that Miguel reached Mount Hope Bay in 1502 and sent men ashore near the rock. The theory is widely accepted in Portugal and not much elsewhere. The American historian Samuel Eliot Morison criticised it severely in his 1971 book The European Discovery of America: The Northern Voyages, and Douglas Hunter’s 2017 study, The Place of Stone, provides copious evidence debunking the Corte-Real origin myth. Gavin Menzies proposed Chinese explorers in his 2002 book 1421.
What the Rock Actually Is
Most modern specialists attribute the original petroglyphs to the Native people of the region — a schematic face on Dighton Rock is similar to a Native petroglyph in eastern Vermont — and the more exotic theories have been taken apart one by one. A 1952 National Park Service report collected the reviews of Delabarre’s book, and the 1971 National Register nomination left the origin of the carvings uncertain. The carvings themselves are dated to before 1500.
That consensus leaves the hardest question unanswered. If the original carvings are Native, what did they mean — and which of the lines we see today are theirs? The face was painted and handled for centuries. Later visitors probably added marks of their own. The stone is real and the carving is real, and after nearly 350 years of argument, that is still almost everything anyone can say with confidence.
What Is Documented, and What Is Not
Documented: Dighton Rock is a roughly 40-ton sandstone boulder, about 5 feet high, 9.5 feet wide and 11 feet long, originally in the Taunton River bed at Berkley, Massachusetts; the Reverend John Danforth drew the petroglyphs in October 1680 (drawing preserved in the British Museum); Cotton Mather described the rock in 1690; Stephen Sewall made a large tracing in 1768 (now at Harvard’s Peabody Museum, catalogue 967-28-10/45474); the rock was raised from the river in 1963 and is now housed at Dighton Rock State Park; the carvings were already heavily effaced by 1768, as Sewall and Kendall both recorded.
Unverified or disputed: Who carved the rock and when (most modern specialists favour the region’s Native peoples, pre-1500, but the attribution is not proven for any individual mark); the Phoenician theory (Stiles, Court de Gébelin), the Norse theory (Rafn, 1837 — rejected by Kendrick and Feder, and shown by Delabarre to rest on doctored drawings), the Portuguese theory (Delabarre, 1912 — criticised by Morison and debunked by Hunter, 2017), and the Chinese theory (Menzies, 2002); what any of the carvings mean; which lines are original and which were added later.
Sources
https://en.wikipedia.org/wiki/Dighton_Rock
https://southcoast360.com/dighton-rock-state-park-carvings-history-special-oct-2026.html
https://www.amusingplanet.com/2022/05/the-strange-petroglyphs-of-dighton-rock.html
https://mystery.dongriarchive.com/2026/05/dighton-rock-river-stone-between.html