Rammed earth and Cor-ten flank the entry and frame the view through the gallery of this Net Zero residence located in the foothills above California's San Francisco Bay designed by Noel Cross + Architects. The walls are a blend of the Franciscan melange site soil, coarse sand, and 3/8” gravel, stabilized with 10% Colton Block cement. Variations between six-inch and eight-inch lifts allowed the walls to mimic the complexity of the geology of the site.
Franciscan Assemblage or Franciscan Complex is a geologic term for a late Mesozoic terrane of heterogeneous rocks found throughout the California Coast Ranges, and particularly on the San Francisco Peninsula. It was named by geologist Andrew Lawson, who also named the San Andreas Fault that defines the eastern extent of the assemblage.
Easily identified by its red-green color (sometimes dark blue) and furrowed, twisted appearance, the assemblage is usually characterized as being primarily metamorphic in nature, its most well-known rocks being serpentine schists. However, the assemblage contains a wide range of different rocks in different stages of the rock cycle. A single outcrop may contain basalt, chert, and other rocks in addition to schist.
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