TY - THES T1 - Paleoecology and the Prehistoric Maya: A History of Man-Land Relationships in the Tropics T2 - Geoscience Y1 - 1974 A1 - Wiseman, Fredrick Matthew KW - Geoscience AB - A series of modern soil samples were collected in lowland Guatemalan rainforest, savannah, milpa, and lakeside association or pollen analysis… JF - Geoscience PB - University of Arizona VL - MS ER - TY - THES T1 - A Neoglacial Pollen Record from Osgood Swamp, California T2 - Geoscience Y1 - 1973 A1 - Zauderer, Jeffrey Norman AB - A core from Osgood Swamp, California, which is located south of Lake Tahoe, in the Sierra Nevada, was analyzed every odd centimeter to depth of 61 cm. The Hypsithermal to Neoglacial transition occurs in the 51 to 49 cm interval. Pinus shows four distinct peaks and troughs, varying more than the other pollen types in the core. The Ericaceae show two distinct peaks accompanying the Pinus lows. Pollen analytical and ecological considerations indicate that bog heaths are the source of the Ericaceous record. The Ericaceae peaks are believed to represent periods of moist coldness corresponding to Neoglacial events in the Sierra Nevada. Correlation of an ash layer at 180 cm, immediately above a radio carbon date of 699 ± 300 B.P. with an ash layer at 170 cm in my core, and other considerations, give an inferred sedimentation rate of about 47 yr/cm in my core. This places the Ericaceae peaks at about 100 A.D. and 1630 A.D., and the Hypsithermal to Neoglacial transition in Osgood Swamp at about 2400 B.P. JF - Geoscience PB - University of Arizona VL - MS ER - TY - THES T1 - Some Palynological Applications of Multivariate Statistics T2 - Geoscience Y1 - 1970 A1 - Adam, David Peter KW - Geochronology JF - Geoscience PB - University of Arizona VL - PhD ER -