奈良三笠山附近の植物および昆虫化石
スポンサーリンク
概要
- 論文の詳細を見る
To determine the geologic age of the andesite of Mt., Mikasa which is intercalated in fossiliferous strata, the entombed plant and insect fossils were investigated., The Huziwara Formation, a marine deposit referrable to F_2-F_3, has yielded some plant fossiis, among which Hemitrapa borealis (HEER) MIKI and Leguminocarpa Sakamotoi MIKI n., g., n., sp., are noteworthy., Among the plant fossils from the Zigokudani-Tugeno Formations (?F_3-G-H_1), subtropical species such as Canarium album RAEUSCH, Fortunearia sinensis REHD., et WILS., Liquidambar formosana HANCE and Stephania Dielsiana WU etc., are worthy of consideration., The abundant occurrence and widespread distribution of the endocarps of Styrax obassioides MIKI in the beds suggest that it may be regarded as an index fossil of the Zigokudani-Tugeno Formations at least on the plateau-land east of the Nara Basin., In the Sirakawaike-Saho Formations, fresh-water deposits referrable to I_1-I_2? have yielded rich and well-preserved floral remains accompanied with scanty insect fragments., The flora can be divided into lower and upper florulae., The former represents the typical Metasequoia-flora; Metasequoia disticha (HEER) MIKI, Picea Koribai MIKI and Juglans megacinerea CHANEY being characteristic., The upper florule, on the other hand, contains abundant fresh-water and marsh plants of the Pleistocene type such as Trapa macropoda MIKI, Menyanthes trifoliata L., Ceratophyllum demersum L., and Carex rhynchophysa, C., A., MEYER etc., Almost all the insect remains belong to Carabidae and some ecological correlations can be recognized between them and the plant remains.,
- 日本地質学会の論文
- 1955-03-25