I have some brachs I recently collected just outside of Swissvale, CO. I believe I have a some Rynchonelida, Strofomenida, Orthida, and possibly some poorly preserved that could be spiriferids though I'm not really sure. Although I can identify them to the level of order, I have no reference for brachiopods in my meagre library so I'm hoping someone here may be able to help out. I'd like to maybe identify some to better than order.
The formations in the area of this age are the Belden and Minturn fmts, I don't know which the fossiliferous mudstone these came out of belongs to. It's very fossiliferous. I also saw some chunks of what looked like a limestone with fossils, though they were too large to collect. I still have a bag of loose matrix to sort through for small fossils. These are just the little ones, and loose brachs I found already eroded out. I have some more larger ones waiting to see a little prep.
The entirety of the tiny collection, including partial brachs and my few token crinoid columnals below.