Where are my fossil peeps?

Any ideas as to what these fossils are? I picked these limestone rocks up near the local wildlife reservoir in Kansas, USA during a fishing trip. The layer where these are located is 2.5-5cm thick. Each black fossil is about 1cm in length.

I’d love to hear anyone’s ideas as to what these might be?

I’ve always had an interest in rocks, fossils, and the environment around me. My favorite college classes were Oceanography (right… in the middle of the continental USA), Astronomy, and the outlier here – Human Growth and Development. I think the last one had more to do with the AMAZING professor who taught it. Ecology of the Environment was a good one too. Mineralogy was tough due to the fact that my eye correction is super high and that seems to make microscope work difficult. — I’ll end my tangent here. —

Back on track – if you have an idea of what sort of creature or plant may have created these fossils, I’m all ears!