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Please can you identify this fossil that I bought in Nigeria? It appears to be a
type of ammonite but its "scales" are not typical of other samples that I have
The 'scales' you refer to are sutures - very well shown in a couple of photos here - http://www.discoveringfossils.co.uk/ammonites.htm (search the page for "Suture marks").
The sutures are important in identification:
- irregular zigzag = goniatite (order Goniatitida)
- regular wavy = ceratite (order Ceratida)
- intricate feathery or fern like patterns = ammonite (order Ammonitida)
There's a diagram of that here - http://www.fossils-facts-and-finds.com/ammonites.html
So the sutures on yours confirm you've got it right so far - ammonite.
More on basic physiology and terminology - http://www.fossils-facts-and-finds.com/ammonite.html.
Skipping alot of looking-up...
Bearing in mind yours is involute, fat (not thin and not discuss-shaped), and without keel...
I think yours might be a vascoceratid such as Vascoceras glabrum, recorded from the Turonian of Nigeria
(many thanks to keen amateur Jean-Stéphane David for such an excellent resource on ammonites)