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Abstract
Palynomorphs from Eocene coaly deposits of the Black Diamond Mines Regional Preserve in California are described. Thirty‐two species of spores and pollen are recognized and two of them, Graminidites scabratus and Arecipites antiochus, are regarded as new. The encountered specimens are characterized by 26% spores, 32% gymnosperm pollen, 41% angiosperm pollen, and 1% foraminifers. The climate is considered to be humid and warm. The depositional environment was a coastal brackish‐water swamp, and age is regarded to be the Middle Eocene.