I have not heard of this method before, but it seems to be a very novel way of collecting detailed fossil and probably other complex information from a difficult matrix.
>>Cloudina was a thin-shelled sea creature that existed about 545 million years ago, but due to the fact that Cloudina fossils are so delicate, they can’t simply be chipped out of the limestone matrix in which they’re embedded. Additionally, because they’re of the same density as that limestone, they won’t show up in X-rays of the rock. That’s where the Princeton Grinding Imaging and Reconstruction Instrument comes in.
It uses a diamond wheel to grind away very thin layers of the rock (fossils included), taking super-high-resolution photos of the exposed rock face after each layer is removed. When those photos are all run together, users are taken on a virtual 3D trip through the rock, seeing all the fossils in their original orientation to one another.<<
https://newatlas.com/giri-fossil-grinding/53613/?utm_source=Gizmag+Subscribers&utm_campaign=59ba56aff0-UA-2235360-4&utm_medium=email&utm_term=0_65b67362bd-59ba56aff0-92533145
