Abstract:

The Cretaceous Charophyte fossils in Dongting basin,Hunan province,can be divided into 4 fossil assemblages from bottom to top.The 1st assemblage (Flabellochara hebeiensis-Aclistochara caii assemblage) is distributed in the Qijiahe Formation,corresponding to Upper Barremian.The 2nd assemblage (Euaclistochara mundula-Mesochara symmetrica assemblage) occurs in the Sanyangang Formation,corresponding to Aptian-Albian.The 3rd assemblage (Porochara gongangzhaiensis-Charites guanpingensis assemblage) is distributed in the Fenshuiao Formation,corresponding to TuronianCampanian.The 4th assemblage (Euaclistochara dongtingensis-Maedlerisphaera minuscula assemblage)occurs in the Yanmatou Formation,corresponding to Mastrichtian.