First Ammonite and Fossilized Sand dollar

[Gulo_gulo]

Checked out a new rock store and have always wanted an Ammonite fossil. Was browsing and wanted to make sure this and the Sand dollar are real? I'm very inexperienced so I can't really tell. Thank you!

[Ludwigia]

Yes they are both real.

[caterpillar]

Yes, both are real.

 Polished Mepygurus depressus and Perisphinctidae from Madagascar

[jpc]

Both are real fossils.  Sand dollars are flat, disc shaped echinoids; this one is a heart urchin (much more three dimensonal).