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The Geology of Delaware

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Outcrop Bd41-b: Rockford Park Gneiss Boulders at Rockford Park

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Rock Outcrop Bd41-b: Rockford Park Gneiss Boulders at Rockford Park

The Rockford Park boulders can be found just beyond the Rockford Tower on the slope facing the Brandywine Creek. Some areas of the Rockford Park Gneiss actually display some banding of felsic gneiss and mafic gneiss which are interlayered on a scale of 4" to 2'. This banding strikes 30 degrees east of north and dips 60 degrees to the northwest. The mafic layers are boudinaged and broken, some of which are weathered away into a prominent relief. Between some layers, the rock is intruded by a coarse-grained and apparently undeformed gabbro.

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Rock Outcrop Bd41-b: Rockford Park Gneiss Boulders at Rockford Park
Rock Outcrop Bd41-b: Rockford Park Gneiss Boulders at Rockford Park
Rock Outcrop Bd41-b: Rockford Park Gneiss Boulders at Rockford Park