Trinchera 1C, Nivel 18, Elemento 1 (foso). Contexto de la Fase Ocós (Clark 1994:547, Appendix 3).
Clark, J. E. 1994 The Development of Early Formative Rank Societies in the Soconusco, Chiapas, Mexico. Unpublished Ph.D. dissertation, Department of Department of Anthropology, University of Michigan, Ann Arbor.