Abundant fossils developed in the Lower Ordovician Honghuayuan Formation at Liujiachang

Songzi

Hubei.Based on their ecological characteristics

the fossils can be divided into three ecologic assemblages such as shelly facies fossil assemblage

reef facies fossil assemblage and perched-water facies fossil assemblage and five fossil communities or taphocoenosis.The reef facies fossil assemblages

in turn

can be subdivided into blue-green algae community at the lower part and the Calathium-Archaeoscyphia community at the upper part.They constitute the well developed orgonic buildup in the mid and upperparts of the Honghuayuan Formation.According to biotic ecological and sedimentological analysis

Songzi region should be located in carbonate platform of low latitude epeiric sea

which correspond to open platform to marginal facies of the platform in general terms during the Early Ordovician Honghuayuan period.