In undertaking this work it was our intention to investigate the well-known
"Earthquake Fault" situated about two miles northwest of the town of Mammoth
in Mono County, California. In working in the surrounding region we
found, however, that this is only a part of an extensive system of similar features.
The locations of those which have been found thus far are shown on the
map (fig. 1), which is reproduced from U. S. Geological Survey topographical
maps, Mount Lyell and Mount Morrison quadrangles. We consider that the
southern and eastern limits of the features shown are real, whereas in the
northern and western directions they represent only the extent of our investigations
to date