Here are some brachiopods I saw earlier in the week in Nashville, Tennessee. I am guessing they are from either the Nashville or Maysville Groups in the Ordovician Period. This first brachiopod might be a Resserella (aka Dalmanella).
These next brachiopods might be Lepidocyclus (Orthorhynchula).
This might be the bottom half of a Hebertella brachiopod.
Maybe a Lepidocyclus brachiopod.
Again another mixture of Lepidocyclus brachiopods.
Some sort of Resserella or Hebertella brachiopods.
Thanks to the website at www.nashvillefossils.com for help with identification.