A long narrow belt of nonfossiliferous, massive to thick-bedded, white to light-gray, fine-grained marble. Composed of nearly pure calcite, but locally contains accessory chlorite, sericite, graphite, quartz, albite, and pyrite (Johnson and Karl, 1985). Plafker and others (1976) and Jones and others (1977) correlate the Whitestripe Marble with the Chitistone Limestone (unit Trcnk) in the Wrangell Mountains and therefore considered it to be a part of the Wrangellia terrane along with the Goon Dip Greenstone (unit Trn). Unit was assigned a Triassic(?) age by Loney and others (1975) on the basis of a fossil found in float. Unit also includes the informally defined marble of Nakwasina Sound (unit Trm of Karl and others, 2015), which consists of light-gray, medium- to thin-bedded metalimestone, which is locally fossiliferous and retains primary bedding structures as well as massive to banded white marble, locally interlayered with volcanic rocks. Unit ranges up to tens of meters in thickness and is associated with volcanic and volcaniclastic rocks mapped in Nakwasina Sound (unit Trvs)