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. 2020 Jun 5;8:e9251. doi: 10.7717/peerj.9251

Figure 1. Geological map of the southeast San Juan Basin showing localities of radiometric dates and important fossil specimens mentioned in the text.

Figure 1

Collection localities; (A) SMP VP-1500, Navajoceratops sullivani, holotype; (B) NMMNH P-27486, Terminocavus sealeyi, holotype; (C) NMMNH P-33906, Denazin chasmosaurine; (D) NMMNH P-37880, c.f. Pentaceratops sternbergii, parietal fragment; (E) UKVP 16100, c.f. P. sternbergii, complete skull; (F) MNA Pl.1747, c.f. P. sternbergii, complete skull; (G) USNM 8604, Chasmosaurinae sp. anterior end of a parietal median bar; (H) purported collection area of AMNH 6325, P. sternbergii, holotype. (I) NMMNH P-50000, Chasmosaurinae sp., skull missing frill. Radiometric dates recalibrated from Fassett & Steiner (1997) by Fowler (2017). Bedrock geology altered from O’Sullivan & Beikman (1963).