The floristic relationship between the upland and lowland Carboniferous wetlands of Variscan Euramerica——Evidence from some medullosalean pteridosperm fronds  

作　　者：Christopher J.Cleal Borja Cascales-Mi?ana 

机构地区：[1]Department of Natural Sciences,National Museum Wales [2]CNRS,University of Lille

出　　处：《Journal of Palaeogeography》2019年第2期130-141,共12页古地理学报（英文版）

基　　金：Part of the work by CJC on the Saarland floras was supported by the Deutsche Forschungsgeneinschaft;the Universitéde Lille(University of Lille) for support through their "Conférencierétranger" scheme

摘　　要：Alethopteris grandinii represents remains of fronds of a medullosalean pteridosperm(probably a small tree) that rapidly migrated across the lowland wetland habitats of Variscan Euramerica in middle Asturian(late Moscovian)times.This was probably caused by changing drainage patterns within the lowland coal swamps,in response to climate and landscape changes.However,these medullosaleans had first appeared rather earlier,in early Bolsovian(early Moscovian) times,in upland wetland habitats.These upland habitats may have pre-adapted these plants to the changed condition in the lowland coal swamps.Alethopteris grandinii represents remains of fronds of a medullosalean pteridosperm(probably a small tree) that rapidly migrated across the lowland wetland habitats of Variscan Euramerica in middle Asturian(late Moscovian)times.This was probably caused by changing drainage patterns within the lowland coal swamps,in response to climate and landscape changes.However,these medullosaleans had first appeared rather earlier,in early Bolsovian(early Moscovian) times,in upland wetland habitats.These upland habitats may have pre-adapted these plants to the changed condition in the lowland coal swamps.

关 键 词：CARBONIFEROUS Coal SWAMPS Medullosales UPLAND Migration 

分 类 号：P[天文地球]