[Solved] As presented at the end of the video, a ...
deposits covered the marble (before mining as a sand pit); these still cover the plate at the north end of the back. These sediments are part of a subaqueous fan system that formed in the Champlain Sea during deglaciation approximately 12,000 years ago. See the image below to visualize the deposition context. By applying the principle of superposition to the other units exposed to the site ...