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This chapter presents a palynological analysis of 74 samples of sediments from 66 cores collected from Holes 474, 474A, 475, and 476, in the mouth of the Gulf of California, and Holes 477, 477A, and 478, in the Guaymas Basin. Palynological-stratigraphic analysis of sediments was undertaken to determine biostratigraphic facies distribution, diagenesis of organic matter, type and origin of sedimentary organic matter, heat flow effects on the organic matter, and the effects of intrusion events upon sediments. Slides prepared with both total and traditional (refractive) palynological residues were subjected to optical analysis. Determination of sedimentary environments was based both on analysis of the physical characteristics of the detrital organic and inorganic products and on micropaleontological analysis of organic remains in the residue.