


How to preserve fossil impressions in mudstone - and why are some of these lighter?
My daughters and I found some fossil impressions (and what seems to be one proper fossil!) at Charmouth beach, UK, today. Most are in very delicate mudstone and appear to just be imprints. Is there any way to preserve this? My 10 year old was very unhappy to hear they are likely to crumble away.
Also are the lighter ones in the image examples of an attempted but incomplete fossilisation of the actual animal? Any structures appear to be very thin and don’t seem to go backwards into the rock to make a complete animal.