Quantitative Biofacies Analysis to Identify Relationships and Refine Controls on Paleosol Development, Prince Creek Formation, North Slope Alaska, USA
نویسندگان
چکیده
Late Cretaceous coastal plain deposits of the Prince Creek Formation (PCF) offer a rare glimpse into an ancient, high-latitude, arctic greenhouse ecosystem for which there is no modern analog. Here, we employ quantitative biofacies analysis to explore spatio-temporal variability in PCF palynomorph and microbiota assemblages from nine paleosol horizons exposed along Colville River, North Slope, Alaska. Biofacies results provide insight paleoenvironmental controls on ecosystem. Cluster ordination analyses recognize five following two assemblage types: (1) fern moss dominated (2) algae assemblages. Ordination arrays environmental gradients related soil moisture marine influence. Fern regularly water-logged paleosols lake swamp margins lower delta clearly segregated periodically drier levee-overbank paleosols. These support previous interpretations sedimentology, paleopedology, geochemistry that suggest fluctuations water table, seasonal river discharge variations topography drainage, controlled development vegetation growth across plain. This biofacies-based approach provides independent predictive tool cross-check interpreting conditions any ancient
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ژورنال
عنوان ژورنال: Geosciences
سال: 2021
ISSN: ['2076-3263']
DOI: https://doi.org/10.3390/geosciences11110460