Abstract
Studies of miospores in the siltstones of various fluvial depositional environments in the Catskill magnafacies have demonstrated a strong correlation between environment and miospore concentration. Most overbank samples are barren, whereas channel bar samples are usually productive of spores. The concentration is lower than in Cenozoic samples of similar origin: about 5000/g maximum. Channel fill samples are another order of magnitude lower: 700/g maximum. Non-red shales, siltstones and silty sandstones contain spores, while red rocks are regularly barren. However, studies of samples collected for palynology on field determination of silt content and non-red color show no “fine tuned” correlation between spore-content and either (1) grain-size as measured in thin section, or (2) ferric/ferrous iron ratios (as a measure of oxidation-level, either at the time of deposition or later).
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