This book proposes an interpretation of the iconographic elements and an iconological analysis of the Huastec sculpture of the so-called "Adolescente de Jalpan", which seems to be related to the iconography and iconology associated with the god Quetzalcoatl and his twin brother, Xolotl. After reviewing the possible symbolism of the sculpture, the author discusses the relevance of the name of the reference work as coming from the Sierra Gorda, Querétaro, México, relevant because previous scholarship proposed that the piece was located at the Tamtok site, San Luis Potosí, and from there it was taken to the Serranogordense area. The author challenges this view, offering a review of the various testimonies – written and oral - that support or refute the notion. Archival documentation, previously unpublished, is cited in the discussion.