These Hagadorn specimens display what life could’ve been like on the sea floor millions of years ago. The traces in the rock are left by animals - from these traces, it is possible to hypothesize about how these ancient organisms moved from one place to another. This is valuable for organisms that were similar to jellyfish - they were soft and couldn’t leave fossilized remains.
In order to get the traces to show, high relief light must be used to illuminate what would other be dull patterns in the rock.