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Resorption of horncores (character 4): (A) (UALVP 40) and (B) (AMNH 5401; flipped), horncore complete; (C) horncore partly resorbed (TMP 1981.019.0175; flipped); and (D) horncore resorbed to base (CMN 8800). Arrows with asterisks = resorbed surfaces; plaster reconstruction = grey. Chasmosaurus russelli (inverted triangle) and Chasmosaurus sp. (diamonds). [planned for column width].
