Goniophyllum pyramidole (Hisinger). Solitary Silurian (Niagaran) tetracoral form Hopkinton Formation, Monticello, Iowa
Solitary Silurian (Niagaran) tetracoral form Hopkinton Formation, Monticello, Iowa;
1 photograph and negative;
Paleontology;
Silurian System--coral specimen
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