geodesy or tectonic fictions

The always brilliant and imaginative BLDGBlog has a feature about Danish geomancers that are getting close to unveiling an “atlas of the underworld,” won through ground x-rays and computerised tomography—that is, CT scanning.
While it’s amazing enough to be able to peer into the depths of what lies beneath (and I thought it would take the whole array of gravitational wave detectors on opposite ends of the globe to bring into any sort of focus what’s under the crust), these early images also narrate an inferred history of continental drift and whole islands, oceans and mountain ranges that are now lost to us ephemeral beings. Realising how short of a time our present map of the world has existed in its recognisable form is really humbling and it makes one wonder what other artefacts—not just fossils or treasure—might have been buried and forgot.