Angiosperms (flowering plants) appeared for the first time during the Early Cretaceous; Archaefructaceae, one of the oldest fossil families (124.6 Ma) was found in the Yixian Formation, China.- Early Cretaceous (Wikipedia)
The Early Cretaceous (geochronological name) or the Lower Cretaceous (chronostratigraphic name) is the earlier or lower of the two major divisions of the Cretaceous. It is usually considered to stretch from 145 Ma to 100.5 Ma.