臺北盆地之古生態研究（2）

Paleoecological study of Taipei Basin (2)

The samples for this palynological study were taken from a sedimentary deposit in the northeast section of the Taipei Basin, namely the Neihu District. Soil was sampled to a depth of 34.5 m, and covered all ranges of the Sungshan Deposit. Altogether sixty-four families, including 12 families of pteridophyta, 5 families of gymnosperms and 47 families of angiosperms were identified. The successive series of plant communities of the Neihu area of Taipei Basin were based on the Sungshan Deposit from about 380,000 to 4,500 years B. P. as follow: Convolvulaceae, Cycadaceae, Typhaceae, Cyperaceae of Tropical plants (33.6 m)→ Pinaceae, Taxodiaceae, Moraceae, Convolvulaceae, Magnoliaceae. Solanaceae, Fagaceae of Subtropical forests with increasing Warm temperate elements (31.5 m)→ Taxodiaceae, Pinaceae, Fagaceae, Elaeocarpaceae and Magnoliaceae of Warm temperate forests (25.2 m)→ Palmae, Cycadaceae, Apocynaceae, Fagaceae, Betulaceae, Pinaceae and Euphorbiaceae of Tropical to Subtropical forests (16.5 m, 6.5 m)→ Taxodiaceae, Pinaceae, Juglandaceae and Trochodendraceae of Warm temperate forests (5.5 m)→ Magnoliaceae, Pandanaceae. Moraceae, Betulaceae and Fagaceae of Subtropical forests (5-1 m).