Sediments of the Eckfeld maar (Eifel, Germany) bear a well-preserved Eocene fauna and flora. Biostratigraphically, Eckfeld corresponds to the Middle Eocene mammal reference level MP (Mammals Paleogene) 13 of the ELMA (European Land Mammal Age) Geiseltalian. In the maar crater, basalt fragments were drilled, representing explosion crater eruption products. By 40Ar/39Ar dating of the basalt, for the first time a direct numerical calibration mark for an Eocene European mammal locality has been established. The Eckfeld basalt inverse isochron date of 44.3 +/- 0.4 Ma suggests an age for the Geiseltalian/Robiacian boundary at 44 Ma and, together with the 1995 time scale of Berggren et al., a time span ranging from 49 to 44 Ma for the Geiseltalian and from 44 to 37 Ma for the Robiacian, respectively. Additional 40Ar/39Ar dating on a genetically related basalt occurrence close to the maar confirms a period of volcanism of ca. 0.6 m.y. in the Eckfeld area, matching the oldest Eocene volcanic activity of the Hocheifel volcanic field.

译文

:Eckfeld maar(德国埃菲尔)的沉积物拥有保存完好的始新世动植物群。在生物地层学上,埃克菲尔德对应于ELMA(欧洲陆地哺乳动物时代)Geiseltalian的始新世中期哺乳动物参考水平MP(哺乳动物古近纪)13。在马尔陨石坑中,钻出了玄武岩碎片,代表了爆炸陨石坑的喷发产物。通过对玄武岩进行40Ar / 39Ar测年,首次为始新世欧洲哺乳动物地区建立了直接的数字校准标记。埃克菲尔德玄武岩逆等时日期为44.3 /-0.4 Ma,表明吉塞他尔/罗比亚剖面的年龄为44 Ma,再加上1995年Berggren等人的时间尺度,盖瑟塔尔纪的时间跨度为49-44 Ma。而Robiacian则从44到37 Ma。在接近马尔的与遗传相关的玄武岩发生上,另外的40Ar / 39Ar年代测定证实了约有一个火山爆发期。 0.6 y.y.在埃克费尔德地区,与Hocheifel火山场中最古老的始新世火山活动相匹配。

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