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Joe Rogan

#2528 - Cassie Coppersmith

Tuesday, 21 July 2026 · 4 min read · Listen to the episode ↗

Cassie Coppersmith, who runs the YouTube channel Secrets in Stone, joins the show to challenge conventional timelines for megalithic sites across India, Cambodia, and Peru. She argues that jade artifacts from the Liangzhu culture dated to around 3400 BC show drill precision impossible to replicate with attributed tools, and that Cambodian temple inscriptions reveal kings claiming to install statues rather than build structures, undermining standard attribution methods.

Cassie Coppersmith runs a YouTube channel called Secrets in Stone focused on megalithic sites in India, Cambodia, and Thailand rather than the more commonly discussed sites in Egypt, Peru, or Turkey. She argues that jade artifacts from the Liangzhu culture, dated to approximately 3400 BC, appear too precise to have been made with the tools archaeologists attribute to their creation. A 1930s experiment using the attributed method of strings with abrasives took a week to cut through a piece of jade the size of a basketball, yet the drill marks inside the bi disc hole are extremely tight and uniform, unlike the thick inconsistent marks that experiment produced. Her theory is that the Liangzhu culture found or was gifted these artifacts from a more sophisticated earlier civilization and treated them as grave goods, paralleling hard stone vases found in Egyptian graves of the same approximate period.

The Hoysala temples in southern India have lathe-turned pillars that archaeologists concede are lathe-turned but attribute to human or animal power. Coppersmith observes that precise dark stonework in these temple pillars is surrounded by cruder stonework above and below, suggesting the pillars predate the surrounding construction. At Cambodian temples, when inscriptions are translated, kings typically wrote that they installed a lingam or brought a statue rather than that they built the temple, meaning archaeologists are attributing construction to rulers who never claimed it. Rogan noted the same pattern applies in Egypt, where it is historically documented that pharaohs including Ramesses II put their names on structures they did not create. Coppersmith applies this reasoning broadly, arguing that civilizations across history were attracted to ancient sacred sites and built on top of them generation after generation, obscuring original construction timelines.

A 2012 Lidar survey of Cambodia revealed previously unknown cities, mound fields, spiral embankments, and hidden structures beneath jungle canopy. The western baray reservoir near Angkor Wat is eight kilometers long and two kilometers wide, and excavating it would have required moving approximately 138 million cubic meters of dirt, equivalent to 53 Giza-size pyramids worth of material. The official dating of these reservoirs is around 900 AD with no credible explanation offered for how they were constructed. Dating methodology for Cambodian temples relies on circular logic, with undated temples assigned dates based on visual similarity to inscribed temples, and carbon dating cannot be applied to stone, so researchers date wood doorways and brick repairs instead. Most Lidar imagery of Cambodian sites remains locked away and is not publicly accessible.

Elongated skulls found in Peru have 20 to 30 percent larger brain capacity and lack the sagittal suture present in normal human skulls. Rogan added that these skulls have larger bones, larger faces, and larger brain volume and are structurally different from artificially deformed skulls. One skull, if proportionate to a full body, would indicate an individual standing seven to eight feet tall, consistent with giant lore found across ancient civilizations worldwide. Coppersmith noted that elongated skulls found at Avebury in England are on very small bodies and may relate to English fairy mythology.

Coppersmith argues that deviating from the academic narrative is career-devastating for PhD students and young archaeologists due to funding, grant, and dissertation gatekeeping, and that many privately suspect sites are older than official timelines but self-preservation prevents them from saying so. She points to Robert Schoch, a geologist with tenure, as an example of a credentialed researcher whose alternative dating claims were harder to dismiss because he used geological evidence such as rain erosion patterns rather than archaeological interpretation alone. Rogan described Schoch identifying water erosion on the exterior of the Sphinx temple, noting that significant rainfall in the Nile Valley ended at least 9,000 years ago and that the Sphinx was buried for much of its recent history, meaning erosion was not occurring during that period. Mainstream geology attributes the erosion to wind and sand, which Rogan noted conflicts with the burial history.

Rogan attributed the absence of ancient structures in North America largely to the Younger Dryas impact, which he said wiped the continent nearly clean, caused 65 percent of all North American megafauna to go extinct, and is supported by core samples showing layers of iridium and micro diamonds associated with impacts. The proposed impact events occurred approximately 11,800 years ago and again around 10,000 years ago. White Sands footprints date to approximately 23,000 years ago, predating the Younger Dryas impact, and mound structures in Louisiana are approximately 9,000 years old. Coppersmith noted that the academic who challenged the Clovis first theory was professionally destroyed by peers but was ultimately proven correct by over 10,000 years.

Coppersmith predicts that AI applied to compiled Lidar scans from around the world could identify previously unknown ancient structures, and that space-based scanning technologies will fundamentally change how humanity understands world history by accelerating cross-cultural archaeological pattern recognition. She argues the current moment is historically unique because researchers can now travel globally, access papers outside university networks, and read scripts from other cultures, enabling synthesis that was previously impossible. Rogan cautioned that AI-generated content and sensationalized YouTube headlines make it increasingly difficult to distinguish truth about ancient history, and that mainstream scholars who resist reevaluating conventional timelines despite mounting contradictory evidence risk losing credibility with attentive observers.

This summary was generated from the episode transcript and can contain mistakes.