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53.1 Chert. Broadford Quadrangle, Virginia. Laminated white chert. This white chert replaced dolostone, which replaced laminated limestone. Black and yellow dots are lichens growing on the surface of the rock. [Scale shows mm and cm divisions.]
Image 107 of 156
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![53.1 Chert. Broadford Quadrangle, Virginia. Laminated white chert. This white chert replaced dolostone, which replaced laminated limestone. Black and yellow dots are lichens growing on the surface of the rock. [Scale shows mm and cm divisions.]](../53.1.JPG)