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agriculture alluvial Amer archaeological areas arid Baja California basins Caribbean Cave Central America central Mexico Chiapas Classic climate coast coastal plain Costa Rica cultivated culture deposits desert drain drainage eastern erosion escarpment extends fauna fish formation genera geological Golfo groups Guatemala Gulf of Mexico highlands Honduras humid Indians Isthmus lakes land limestone lower lowlands MacNeish maize Maya Mesa Mesa Central Mesoamerica Mexican Plateau Mexico and Central Middle America montane mountain Nicaragua northern northwestern Oaxaca occur Pacific Panama Peninsula period Peten phase plants Pleistocene Postclassic Preclassic preconquest province rain forest rainfall range region river rocks salinity savanna seasonal shrubs Sierra Madre Sierra Madre Occidental slopes soils South America southern Mexico species streams surface Tamaulipas Tehuantepec temperatures Teotihuacan Tepexpan Tequixquiac tion trees tropical upper Valley of Mexico vegetation Veracruz volcanic western Yucatan zone