Anther super nice sphenodiscus!!!

[RonB]

ziepe wrote:
Hi Ron,

you allways amaze me with your ammonites, \"holy banana batman\" - as Robin would brilliantly state it. But I have a question as a non-ammonite-dude: are those ammonites part of a ironstone nodule ? It seems to me that they are but I can\'t be sure.

Enlighten me

Z.

I have always called them \'concretions\' but have heard them called noduals also. Im not really sure what makes them. I have heard that when a critter dies and gets buried, the trapped rotting gasses draw in iron molecules and hardens the matrix. But im purty sure that there are many ways of a concretion being made by mother nature?