科研之友
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摘要
The family Fabaceae, one of the most abundant and diversified of the recent eudicots, has a fossil record in the taphoflora of the Entre-Corregos Formation (Eocene-Oligocene). This formation is constituted by papiraceous shales deposited under euxinic lacustrine conditions of the Aiuruoca taphrogenic basin, in the southeastern area of the Minas Gerais State. This basin is inserted in the Cenozoic Rifting System of the Southeast Brazil. The Fabaceae record presents itself like impressions of detached and attached folioles of the macrophylls of a new species of Caesalpinia (Subfamily Caesalpinoideae), two new species and one form identified only in generic level of Machaerium (Subfamily Faboideae) and as affine pollen grains. Considering their modern climatic, habitat and habits preferences it is possible to infer that they are components of a humid climate Neotropical flora, being member of the upper arborescent stratum of the association (15 to 20 m high), in the submountain area of the Atlantic Forest. In Brazil, these genera, were only known from Paleogene record from the Brazilian Southeast (Fonseca, Aiuruoca, Taubate, Tanque and Sao Paulo basins). The total palynological association suggests an Eocene-Oligocene age.
- 出版日期2014-12
