The Djoser pyramid in Egypt is known as the oldest in the world at 4,700 years old. A new paper published in Archaeological Prospection calls that record into question with the strong claims of a “prehistoric pyramid” in Indonesia that is up to 27,000 years old. Not everyone is buying the research, however, and now the journal has launched an investigation into the study.

“I’m surprised [the paper] was published as is,” Flint Dibble, archaeologist at Cardiff University, told Nature, which first reported the investigation into the paper. Dibble’s questions pertain not so much the data from the Gunung Padang site, but rather to the conclusions drawn by the authors.

The paper’s authors write that they have “compelling evidence of a complex and sophisticated megalithic site.” Using seismic tomography, the researchers have come to believe that hidden cavities or chambers exist, showing the “presence of multi-layer constructions.”

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