Medium- to fine-grained, medium- to light-gray marble in thin layers associated with schistose metavolcanic rocks of the Wales Group. Locally, the marble is massive and ranges up to 300 m in thickness (Eberlein and others, 1983). Herreid and others (1978) describe dolomitic marble that forms thick, planar, fine-grained, medium- to light-gray beds that stand out in relief relative to interlayered marble. Near the contact with Wales Group greenschist, tabular dolostone bodies in the marble have been deformed into boudins 10 to 30 m long and up to 10 m thick. Locally, irregular, folded dolostone bodies have marble beds draped around them, suggesting deformation of the rocks after deposition of the dolomite. In a few places, dolomite veinlets crosscut the marble (Herreid and others, 1978)