Both halves found in the rock.
Ordovician.
Galena Formation.
Fillmore County, Minnesota.
Conulariid
Robson, S.P., & Young, G.A. (2013)
Late Ordovician Conulariids from Manitoba, Canada.
Journal of Paleontology 87(5):775-785
Piranha from thefossilforum.com provided not only the ID, but the drawn pic and reference. 🙂
This was an unexpected and fascinating find because I found it as I was laying a rock path in front of my home from 100+ year old barn foundation stone. One of the rocks splintered into layers as I laid it and was very heavily fossilized including this Conulariid! The barn was from just east of Wykoff, which is a very heavily fossilized area.
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