Search the Community
Showing results for tags 'evolute'.
Found 2 results
-
From the album: Bobby’s ammonites
Evolute Lytoceras llminster uk Tiny but rare -
Total newbie here. I'm trying to catalog my ammonite collection and have a few pieces that I just can't seem to figure out. Both of these are evolute ammonites. Each has a bit of remaining iridescent nacre near the umbilicus, which is why I think they're likely Cretaceous fossils from Madagascar. The outermost spiral of the larger one has considerable girth (27 mm across the squared off end), while the smaller one is pretty uniform (9mm at the squared off end) and almost wholly agatized. The small one came from a rock shop in Northern California (Chapman's), and the larger one came from online; both claimed to be from Madagascar. I know some of the diagnostic characteristics have been polished off, but I'd really love to know at least what family or genus these are. Thank you very much for your help! Er...I might have more mystery ammonites after this. Is it less annoying to put them all into one post, or spread them out over a few weeks?
