Plant or animal?

[Plantguy]

Nice finds! The brach fragment would make me want to look for more--took me awhile to find some complete ones over in Kentucky years ago after finding a few pieces. I agree with Herb on the possible family/Genus. Cant help with the corals but they are interesting also. I wonder what they look like with a polished cross section? 

As Kim pointed out looks like you have all kinds of Ord/Miss aged material to look in. https://ngmdb.usgs.gov/ngm-bin/pdp/zui_viewer.pl?id=7339

National Geologic Map Database
Preview

 

Haley, B.R., Glick, E.E., Bush, W.V., Clardy, B.F., Stone, C.G., Woodward, M.B., and Zachry, D.L., 1993, Geologic map of Arkansas: U.S. Geological Survey,  , scale 1:500,000

 

Continued hunting success. 

Regards, Chris 

 

 

[Herb]

it looks likely you could have mixed Mississippian and Devonian in the same area. The Miss. horn corals are not usually as big as the ones you have.

[Herb]

With the biifurcated plications, (shell ridges split into 2 at exterior of shell edge) I am pretty sure the brachiopod is Orthotetes sp.