Planorbis freshwater gastropods?

[VStergios]

Found this mortality plate in the thin compact layer between neogene conglomerates and marl, above the flysch, at Milia beach in Alonissos island, Greece.

According to a paper regarding the neogene in Alonissos [ http://sciencepress.mnhn.fr/sites/default/files/articles/pdf/g2019v41a3.pdf  ] findings from marl deposits in an abandoned lignite quarry near Votsi village include Planorbis freshwater gastropods. Have I also found planorbis gastropods? Am I looking at Miocene or Pliocene fossils? As always any suggestions are much appreciated!

[jpc]

They look very much like Planorbis

[VStergios]

@jpc Going to post more shots once I uncover more individuals from the plate surface. Very slow process involving frequent spraying with dissolved paraloid because they are very brittle, probably due to long term exposure to moisture.

[abyssunder]

If the holding sediments are terrestrial, Planorbis / Planorbarius or similar could be countered, otherwise we could be on the wrong way.

[VStergios]

@jpc @abyssunder  

Unfortunately there is little documentation about Alonissos and these gastropods are the only thing visible on the plate. This is my progress so far: