In an attempt to establish an archaeological chronology for northwestern Costa Rica, excavations were carried out in 1959-60 in the coastal region and Tempisque River drainage of Guanacaste Province. Four periods have been defined: Zoned Bichrome, Early Polychrome, Middle Polychrome, and Late Polychrome. These are roughly equated in the Maya sequence with Late Formative, Early Classic through the beginning of Late Classic, the latter part of the Late Classic through the early Postclassic, and late Postclassic, respectively. The Zoned Bichrome period has been established on the basis of three geographically separate but coeval phases: Chombo on the Santa Elena Peninsula, Monte Fresco in the Tamarindo Bay zone, and Catalina on the middle Tempisque. All three phases are linked to each other through trade pottery; a radiocarbon date on Monte Fresco is within the first century of the Christian era. Outstanding characteristics of the period are bichrome zoning, dentate rocker-stamping, wavy black lines produced by a multiple brush, engraving, and incising. Considerable fishing and hunting was carried out, and intensive maize agriculture is inferred. These village materials indicate that lower Central America was participating in at least some of the trait diffusion which linked remote areas of Nuclear America in Formative times.
According to our reconstruction of the sociopolitics of tenth-century Chichen Itza, the polity was ruled by a paramount king who identified himself with the sun. A high priest, the second-ranking figure, stood by the king's side. A political and military elite, with an S-shaped serpent as its emblem, shared power with these top figures. Finally, the whole community of warriors was treated as a collective corps with important religious and political responsibilities. The iconography of the Temple of the Wall Panels depicts the initiation of jaguar knights by a warrior figure designated as Serpent Jaguar. The same individual, also represented and designated on the slab covering the cache buried in the upper temple, was assisted or controlled by personages who ranked above him. The panels illustrate the destiny of the jaguar-warriors after their glorious death, first as they accompany the rising sun and, later, as they transform themselves into birds. This interpretation appears very close to the destiny of the dead Aztec warriors as recounted by Sahagún and other chroniclers. The butterfly/bird theme, associated with warriors, indicates that similar beliefs were current at Teotihuacan. The Temple of the Wall Panels, too small to be a telpochcalli was probably a house used by warriors, as indicated by its images and its distinctive architecture, which are shared at the same site by the Temple of the Warriors.
An attempt is made to correlate the finds recently published in this journal by Doris Stone and Carlos Balser with the Coe-Baudez sequence in northwestern Costa Rica. The 25 tombs at La Fortuna cover the whole Linear Decorated period, with one tomb belonging to the preceding and another one to the succeeding period. The material listed from Guácimo is tentatively dated to the Middle Polychrome period corresponding to the Mesoamerican Postclassic. It is shown that these finds do not contradict the Coe-Baudez sequence, but rather confirm it. A few remarks are added about the condition of Costa Rican archaeology.
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