Abstract
In the southeastern portion of Mount Rainier National Park seams of lignitic material occur locally in a thick series of arkosic sandstones and shales which can probably be correlated with the Puget series of the Eocene. Some members of this series, however, have been so altered by low-temperature metasomatic replacement that they resemble portions of the Keechelus andesitic series of the Miocene as described by Smith and Calkins in the Snoqualmie folio. This type of metamorphism is especially well developed in the incompetent carbonaceous material which is replaced locally by a fine-grained, igneous-appearing dacitic groundmass containing porphyroblasts of quartz and plagioclase.
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