Ruth Mottram on Nostr: Is there a geologist/palaeontologist on the line? Kid asked very good question this ...

Is there a geologist/palaeontologist on the line? Kid asked very good question this morning: why is this fossil ammonite in a round concretion? As in how was it preserved? (I explained that in some locations you find roundish stones that when broken in half reveal a fossil ammonite or other fossil inside). But why do they form in these roundish shapes? What is the preservation method.
I no longer remember where this came from but I think, Whitby?

#Ammonite #Fossil #palaeontology #Geology