I would grateful for any information .
This pair of ammonites where found at Charmouth Dorset UK
West of the river.
The rock was located towards the cliff base partially buried
in the sand/gravel with the fossils face down and resembing a mushroom due to
the eroded under cut.
Dear Spider thank you for your interest and the information.
After making an internet search for Microderoceras birchi, which
I presume is the Latin name of the species, and finding other examples I cans
see exactly what you are describing as spine node bases, regards JP
Dear Mudbug thanks for posting, yes the specimen was taken
How would you proceed with further examination? I thought
about looking for any signs on the sides of the rock and then splitting it
along the bedding plane with a cold chisel just above this point and then using
an engraver to slowly remove the matrix, or is that method a bit crude and
would it be better to start with the engraver first.
I must say, at this point, that the specimen was actually
found by my brother so he would be the one to decide whether or not to proceed
with any destructive investigation but it will be a pleasure to keep you posted,
I think he is referring to most people would hit the boulbous nodular end to have a look what could be contained within the nodule. With the other ammonites attached 'potentially' there could be a complete Microderoceras inside the rock. Sometimes the nodule will open revealing the contents if hit right but very often whats in there (if anything) could equally feasably be destroyed. Sometimes its just calcite crystals. Its the chance you take. One thing you could do first is cut off the chunk with the visible ammonites on using a rocksaw (ask someone to do it or hire one if you dont have one) and then try and crack the nodule open, at least then you will have saved what you already have. You need a sharp blow using a lump hammer roughly on the central point of the boulbous bit. The bedding planes are indicated by the visible striations in the rock to give you some idea how things should go. Good luck if you attempt it.
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