AI Summary
5 min readCassie Coppersmith, host of the YouTube channel Secrets in Stone, first encountered the anomalies that now define her research in the British Museum. She walked past a wall filled with ancient Chinese artifacts made of nephrite jade, an extremely hard stone, and immediately noticed something wrong: they looked machined. The artifacts, attributed to the Liangzhu culture and dated to around 3400 BC, include the sung tube—a tall, square tube with a perfectly circular inner bore and 90-degree corners—and the B disc, a large, flat, donut-shaped ring with a perfectly drilled hole down the center. The problem is the tools archaeologists say were used to make them: bamboo, string, and sand. An experiment in the 1930s showed that cutting through a basketball-sized piece of jade with such tools took a week. The artifacts themselves show drill marks that are tight, uniform, and consistent with a machine—Coppersmith points out that on some discs, the drill marks suggest the stone was flipped and drilled from both directions, meeting precisely in the middle. She believes these objects are out of place, akin to the hard stone vases found in Egypt, and that they were likely inherited or found by the Liangzhu culture, which then treasured them as grave goods rather than producing them.
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What you'll learn
- 1 (00:44) **Introduction to the Liangzhu Jade Mystery** - Cassie explains how she first encountered anomalous nephrite jade artifacts at the British Museum that appear machine-cut, and introduces the two main types: the cong tube and the bi disc.
- 2 (03:41) **Drill Marks vs. Bamboo Experiment** - Visual evidence of the bi disc's interior drill marks is compared to an archaeologist's experimental bamboo drill core, showing a stark difference in precision.
- 3 (06:03) **The Cong Tube & The King of Jade** - The most puzzling artifact, the cong tube, is a complex shape with perfect 90-degree corners and a round inner tube, carved from very hard nephrite jade.
- 4 (11:40) **The Path to Questioning History** - Cassie explains how she started investigating these inconsistencies, naming her channel "Secrets in Stone" based on the belief that the stones tell their own story.
- 5 (16:33) **Evidence of Ancient Machining in India** - Discussion of lathe-turned pillars at Hoysala temples in southern India, which show clear lathe marks on pillars feet across.
- 6 (22:40) **Moved Pillars & The Problem with Inscriptions** - Cassie observes that the most precise, dark stone pillars in many temples appear to have been moved from older, original structures and incorporated into newer, cruder ones.
- 7 (24:50) **A Pre-Flood Timeline & Global Connections** - Cassie states her belief that the oldest structures are pre-flood (more than 12,000 years ago), citing Peru, Egypt, and especially India as incredibly ancient.
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Show Notes
Cassie Coppersmith is an independent researcher studying ancient civilizations and archaeological mysteries, and host of the “Secrets in Stone” podcast.
www.youtube.com/@CassieCoppersmith
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