Sorry it has been so long – been really swamped.
Soft tissue preservation. It is extremely rare to find any soft tissue preservation in fossils. However there are some cases when this does occur. One very special location is in New York. The fossil trilobites exhibit outstanding soft tissue preservation in Pyrite – fools gold. The picture here is a trilobite from my own collection. It clearly shows the legs and antenna. Here is an additional link to more info especially about trilobite EGGS ! https://www.academia.edu/31447511/Pyritized_in_situ_trilobite_eggs_from_the_Ordovician_of_New_York_Lorraine_Group_Implications_for_trilobite_reproductive_biology