Myliobatiformes Compagno 1973
Among rays, only Myliobatiformes' teeth are found in local sands.
All found specimens are tooth plates with multiple roots. Such plates are characteristic of families Myliobatidae and Rhinopteridae (Underwood et al., 2015).
Unlike other chondrichthyans, these rays lack really strong tooth materials. Pieces of the plates are very frequent, and complete plates – very rare findings. Here are the most intact ones.
Burnhamia daviesi (Woodward, 1889). Family Mobulidae Gill 1893.
A little 4-root lateral plate.
Notice typical for the genus unworn working surface with lots of elongated pits.
It looks like it wasn't in use at all.
Microstereopair of the working surface
The same species. A bigger 5-root plate.
Like previous one, it has well-preserved deep pits and grooves.
Myliobatis Cuvier, 1817
Big 15-root medial plate.
And this one worked hardly: the surface is polished and scratched.
Some links:
Ray's mouth on pdphoto.org: the context
Burnhamia daviesi on gafossil.awardspace.com
Aetobatus tooth plates on australianmuseum.net.au