Fish tooth microfossils from South Lithuania- please help with ID

[D.N.FossilmanLithuania]

Dear Guys,

 

Couple years ago I found this erratic of yellow sandstone in Varena town, South Lithuania and there were many tooth microfossils that I could not identify.

One small tooth has cutting edge but the other are flat. In my opinion they look similar to ray- finned fish remains and I guess this erratic boulder can belong to Triassic or Jurassic. 

The remains are only 1- 2 mm length. Please help me to know what types of fish I have found in this erratic boulder and what the age could be. 

Any help will be appreciated!

 

Best Regards

Domas