Named as a formation in Allatoona Complex. Named for Rowland Spring Branch, Allatoona Dam quad, Bartow Co., northwestern GA. Consists of greenish-gray gneiss and granofels of probable metavolcanic origin that has been metamorphosed to pyroxene-granulite grade during Grenville metamorphism. Contains clots of red garnet. Occurs scattered through Corbin Metagranite (revised). Because it has only been mapped as roof pendants or xenoliths in Corbin Metagranite, stratigraphic thickness and placement are unknown. It is intruded by Middle(?) to Late Proterozoic Corbin Metagranite (revised) and by Early(?) to Late(?) Proterozoic Red Top Mountain Formation revised(?). Age is Early(?) to Middle Proterozoic. Report includes geologic map and correlation chart.

Source: GNU records (USGS DDS-6; Reston GNULEX).