Silicified Echinoid

Description

A "badly preserved silicified **echinoid**", according to an expert (via Jamie). Nevertheless, a great toy specimen to [explore photogrammetry!](http://mielke-bio.info/falk/posts/22.photogrammetry) Photos and reconstruction: Falk Mielke (using Agisoft Metashape), decimated to 500k faces for upload. The little paper shows 5mm squares as size reference. Fossil found and donated by Katrin (Dankeschön!)