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Primary terms
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Climate Leaf Analysis Multivariate Program
When are leaves good thermometers? a new case for leaf margin analysis
Relationships between leaf morphology and climate, Bolivia: implications for estimating paleoclimate from fossil floras
GENERATING EMPIRICALLY DETERMINED, CONTINUOUS MEASURES OF LEAF SHAPE FOR PALEOCLIMATE RECONSTRUCTION
Automated leaf physiognomic character identification from digital images
Paleoenvironment of the Quilchena flora, British Columbia, during the Early Eocene Climatic Optimum
The Hell Creek Formation in eastern Montana has yielded well-preserved leaf megafossil localities that provide insight into the vegetation and climate of the latest Cretaceous. Among the most basal, the PDM locality (UCMP [University of California Museum of Paleontology] PB99057 = MOR [Museum of the Rockies] HC-278) occurs in channel sandstones ~10 m above the underlying Fox Hills Formation. The locality represents a fluvial/estuarine environment. Leaf megafossil impressions were preserved on clay drapes within the channel. Angiosperms dominated the flora (13 of 17 morphotypes). Dryophyllum subfalcatum and “ Vitis ” stantoni , two common morphospecies in the Hell Creek Formation, are well represented. Gymnosperms including Metasequoia , Glyptostrobus , Cupressinocladus , and Ginkgo are rare; ferns and cycadophytes are absent. Univariate leaf-margin analysis produced mean annual temperature (MAT) estimates of ~7–11 °C (5–14 °C including overlapping estimation errors). The Climate Leaf Analysis Multivariate Program (CLAMP) produced a MAT value of 11–12 °C ± 2 °C. Leaf area analysis produced mean annual precipitation (MAP) estimates of 197 cm (+152/−86 cm) and 191 cm (+161/−87 cm), while CLAMP produced a growing season precipitation estimate of 82–90 ± 48 cm. The wetter MAP values are consistent with paleosols near the base of the formation, which lack paleosol carbonate. CLAMP results further suggest seasonality in both temperature and precipitation. Some PDM morphotypes are familiar from the Hell Creek I floral zone of North Dakota, and several are not, suggesting greater spatial and/or temporal heterogeneity in the Hell Creek Formation flora than has been previously appreciated.