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By Ruth A. M. Schmidt, Warren J. Nokleberg, Robert A. Page

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L. Ambos, W. D. Mooney, and N. I. Christensen, Crustal structure of accreted terranes in the Chugach Mountains and Copper River basin, southern Alaska, from seismic-refraction results, Journal of Geophysical Research, 1989, in press. Goodwin, E. , G. S. Fuis, E. L. Ambos, and W. J. Nokleberg, The crustal structure of the Wrangellia terrane along the Tok Highway, eastern southern Alaska, Journal of Geophysical Research, 1989, in press. Jones, D. , N. J. Silberling, P. J. Coney, and G. Plafker, Lithotectonic terrane map of Alaska, h N.

More detailed guides to the Quaternary geology of the region are given by Ferrians and others (1983), and Pewe and Reger (1983a, b). Please note that because of local rerouting of the highway, not all mileposts are always in place, and in a few cases, mileposts are misplaced. ~ e c a u s eof the complex geology, poor outcrops, and limited age data, developing a geologic history and tectonic interpretation in the region is difficult. Consequently considerable variation exists in interpretation. The interpretation in this study is mainly a result of the TACT program studies of the first and third authors, and is a modification of interpretations of the second author as presented in Foster and others (1987).

Locally abundant relict igneous biotite and muscovite occur in some of the metagranitic plutons. These metagranitic plutons are interpreted as Late Jurassic and Early Cretaceous, as determined from metamorphic ages for K-Ar biotite and white mica, discussed below. The metavolcanic rocks of the metamorphic complex are generally massive. However sparse outcrops display volcanic breccia and pillow andesite structures.

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