Yangshan, Jiangning, Nanjing, China
Yangshan Quarry
Ming, about 1405 (abandoned in the quarry)
Three pieces of one stele, a base, a body, and a crown, sit unfinished in a limestone quarry east of Nanjing. The usual estimates add to about 31,000 tonnes. The work is the Yongle emperor’s project of 1405 for his father’s mausoleum, abandoned because the stones could not be moved.
Why this is extraordinary
Yangshan is a limestone quarry on a low mountain east of Nanjing, about 15 to 20 kilometres from the city wall and from the Ming Xiaoling, the mausoleum of the Hongwu emperor. The hill had already been cut for buildings and statues for centuries. In 1405 the Yongle emperor ordered a giant stele here for that mausoleum. A Chinese memorial stele is three stones: a base, a body, and a crown. All three were roughed out. None was freed. The project stopped because the pieces could not be moved, and could not have been set up. The southwestern pit is the working on the southwest side of the hill. East of Nanjing is simply where the quarry sits. No degree is printed in the sources this room uses. A quarry face can take the afternoon sun, or it can sit where the good stone was. That is orientation of a working, not an alignment aimed at a sunrise.
The usual published estimates are about 16,250 tonnes for the base, about 8,800 for the body, and about 6,100 for the crown, together about 31,000 tonnes. They are estimates. Each piece is still joined to the mountain, so none has been weighed on a scale. The base is given as 30.35 metres long, 13 metres thick, and 16 metres tall. The body is 49.4 metres long, which would have been its height if it had been stood up, 10.7 metres wide, and 4.4 metres thick. The crown is 10.7 metres tall, 20.3 metres wide, and 8.4 metres thick. Stacked, the stele is put at about 73 metres. The tablet that was actually erected at the mausoleum, in 1413, is 8.78 metres tall.
The stone is limestone. Calcite, the mineral of limestone, is the reference step 3 on the Mohs scratch order. Iron is 4 on that order, and ordinary steel is 4 to 4.5, so a metal edge can scratch this rock. The open problem is not a stone too hard to mark. It is a mass that never moved.
The photographs show the method in the hill. A slot isolates the base. Vertical marks run down the cut faces. The body is undercut, and it still rests on piers of rock that were left in place, with the path running underneath. Accounts of the site say a dragon for the crown had been started. The crown in the photograph is still a rough block with an opening cut through it.
The date is a Ming project of 1405, abandoned on purpose, not an undated monolith. The scale is real either way. A granite shaft that also never left its trench is the unfinished obelisk at Aswan. The likeness is the stopping. The stone, the tools, and the century are different. That room is the unfinished obelisk. What changes, if you stand in the slot, is the question. Not whether the rock could be scratched, which the hardness allows, but how a body still sitting on its piers was ever going to move.
Why it matters
An abandoned quarry keeps the method in view. Here the method is slots, cut faces, and piers of stone still holding the block. The historical date is firm. A reading that the cuts are too large, or too even, for Ming iron, or that they are older than 1405, has to meet that date and this soft stone.
Limestone from this hill had supplied Nanjing since the Six Dynasties. The giant stele was a Ming order inside an old quarry, not the first cut on the mountain. When it was given up, a much smaller stele was set in the mausoleum’s square pavilion in 1413. The three giants stayed where they were roughed out.
Photo tour
4 photographs, unedited. On a phone, swipe the row. Choose one to look closely.
What is still unexplained
These sit beside the consensus account, with the same visual weight. None of them is marked solved.
Location and dating
- Location
- Yangshan, also called Yanmen Shan, northwest of Tangshan, Jiangning District, Nanjing. The stele body is the pin. The base and the crown are a short walk away, in the same cuts.
- Period label
- Current consensus — open to revision The quarry is older than the Ming. The giant stele is 1405, under the Yongle emperor, for the Ming Xiaoling of his father. The substitute tablet at the mausoleum is 1413.
- How this dating was done
- The date is historical. It is the Ming record of the order, read against the three-part form of a memorial stele and against the smaller stele that was installed when this one was given up. Limestone cannot be radiocarbon dated into a reign.
- What could change it
- A quarry inscription that named a different reign for these three pieces, or a tool mark that could not be made with iron on calcite.
What is actually there
- Limestone. Calcite is Mohs step 3. Iron is 4. Ordinary steel is 4 to 4.5.
- Three unfinished pieces, base, body, and crown, still joined to the hill.
- Usual mass estimates about 16,250, 8,800, and 6,100 tonnes, about 31,000 together.
- Published assembled height about 73 metres. The stele that was actually set up is 8.78 metres.
- A slot around the base, vertical marks on the faces, and the body still resting on uncut piers.
Open questions
| Question | Status |
|---|---|
| How were the slots and the faces cut? | Iron on limestone fits the hardness; the photographs show the slots and the piers |
| Could the base have been moved to the mausoleum? | The project was abandoned on that judgment; no successful method is recorded here |
| Are the giant cuts older than 1405? | Open as a reading; the three-part stele and the 1413 substitute point to the Ming order |
The current narrative
Where publication stands today. It is the best-supported reading, and it is open to revision. It is not a verdict.
The current narrative — open to revision
A Yongle stele, stopped because it could not be moved
In 1405 the three pieces were cut as the stele for the Ming Xiaoling. After most of the separation was done, the move to the mausoleum, and the setting up, were judged impossible. The work stopped. A smaller stele was installed in 1413.
What supports this
- The three pieces are a base, a body, and a crown, which is the ordinary design of a Chinese memorial stele.
- The order is dated to 1405, and the substitute tablet at the mausoleum is dated to 1413.
- The blocks are still attached, which is what an abandoned transport looks like.
- Limestone at Mohs step 3 can be cut with iron. The slots and the piers match a quarry that stopped, not a stone that could not be scratched.
What pushes back
- The tonne figures are estimates of pieces that were never freed. The exact mass is not a scale reading.
- No engineer’s drawing of the attempted move is in the sources used here. The abandonment is the evidence that the move was given up.
- The hill was a quarry long before 1405, so not every cut on the mountain belongs to the stele.
What would settle it
The Ming date and the reason for stopping hold. The unsolved transport is part of that reading. It is why the stones are still here.
Emerging narratives
Other published readings. Each may be right. None is adopted here unless the evidence carries it.
An emerging narrative
Cuts that imply another method, or an earlier age
The faces are too large, or too regular, for Ming iron wedges and chisels, or the three pieces were roughed out in an earlier age and only noticed, or only claimed, in 1405. The abandonment would then be a failure to move someone else’s stone.
What supports this
- About 31,000 tonnes, even as an estimate, is outside the stones Nanjing actually set up. The erected stele is 8.78 metres, not 73.
- No timed trial in the sources used here has reproduced a slot of this length in limestone with a recorded Ming toolkit.
- A flat plane of this height invites the thought of a guide or a machine. The eye reads regularity before it reads the rough grain.
What pushes back
- Calcite is step 3. Iron at 4 and ordinary steel at 4 to 4.5 are harder than the mineral. Hardness does not forbid the cut.
- The photographs show rough grain, vertical marks, and leftover piers. They do not show a polished, continuous machine pass.
- The three-part form, the 1405 order, the started crown, and the 1413 substitute are one project. An earlier age would have to explain why the pieces are a Ming stele’s base, body, and crown.
- Earlier quarrying on the hill is real, and it supplied ordinary Nanjing building stone. It is not, by itself, a date for these three masses.
What would settle it
Possible only where the record is thin, which is the transport method, not the reign. An earlier age or an unknown cutter is not the better reading of a stele that matches a dated order and a stone iron can scratch.
Should the current view be reevaluated?
Consensus holds well
The Yongle project of 1405 holds. The stones were abandoned as untransportable. Unknown methods, or a deeper antiquity, are not required by faces that limestone and iron can produce. The mass remains extraordinary inside that date.
What drives this
- A recorded order in 1405 and a smaller stele set up in 1413.
- Three pieces that match a memorial stele, still attached to the hill.
- Limestone at Mohs step 3, against iron at 4.
This is the museum’s own weighing of the evidence. It is not a visitor vote, and it is separate from the slider.
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If the contested reading is right
What would follow if a reading that is not the consensus turned out to be true, and what could settle it. This explains the stakes. It does not adopt the reading.
The cuts are older than the Ming order, or needed an unknown tool
The 1405 project would be an attempt to claim or to move stones the Ming did not begin. Nanjing’s dated quarry work would shrink to the smaller stele and to the ordinary building stone. A new toolkit would have to be named, and found, for a mineral iron can already scratch.
Why it is still worth a test
A mark on these faces that iron on calcite does not make, or a quarry text that gives the three pieces a reign other than Yongle’s.
Sources
- Yangshan Quarry Wikipedia
- Imperial Tombs of the Ming and Qing Dynasties UNESCO World Heritage Centre
- Mohs scale of mineral hardness Wikipedia
Image credits
- The stele body, right, still standing on uncut piers, and the stele head, left. A path runs between them. Neither piece has left the hill. The southwestern cut is a side of the quarry, and the sources this room uses print no degree. . Vmenkov, CC BY-SA 3.0. Shown unedited.
- The base, with a channel cut between it and the mountain. The block is isolated on the sides and still part of the hill. . Vmenkov, CC BY-SA 3.0. Shown unedited.
- The face of the base. Vertical marks run down the limestone. Water staining and tool passes are both possible in a streak like these. The plane of the face is the cut. . Vmenkov, CC BY-SA 3.0. Shown unedited.
- The southwestern pit. People at the lower left are the scale. A corner of the base is the mass at the right, and the quarry wall behind is cut in tall planes. . Vmenkov, CC BY-SA 3.0. Shown unedited.