A thick section of metamorphosed Paleozoic and Mesozoic rocks is exposed in two roof pend- ants, one each in the Mount Morrison and Devils Postpile quadrangles in the eastern Sierra Nevada near Mammoth Lakes, Cali- fornia (Fig. 1). In the course of geologic mapping in these quadrangles by the U. S. Geo- logical Survey in co-operation with the California Division of Mines, fossils of Ordovician, Pennsylvanian, Permian(P), and Early Jurassic ages were collected from weakly metamorphosed parts of the pendants. Detailed map- ping in the Mount Morrison quadrangle has been completed by Rinehart and Ross, and a report on this area is in preparation. Similar mapping in the Devils Postpile quadrangle by Rinehart and Huber is in progress. In the part of the Devils Postpile quadrangle not yet covered in the present study, the contacts shown on the map (Fig. 1) are after Erwin (1934). Because diagnostic fossils are extremely rare in the metamorphic rocks of the Sierra Nevada, these fossils are considered important enough to merit this short note prior to completion of the detailed mapping in the Devils Postpile quadrangle and the publication of more comprehensive reports on the two quadrangles
