The Brevard zone separates two regions on the Georgia Piedmont that have different drainage styles. Streams on the northwestern Piedmont have trellis drainage, which suggests that they have undergone a different evolution than streams that have dendritic drainage, on the southeastern Piedmont. It is concluded that Coastal Plain sediment covered the southeastern Georgia Piedmont to at least the Brevard zone. Consequent streams developed a dendritic drainage on this cover and became superimposed across buried resistant northeast-trending geologic structures. Trellis drainages, however, developed as a result of subsequent streams being controlled by Piedmont structures on areas of thin or no Coastal Plain sediment cover.

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