Page 26 - muehlberger1954

-16-

clinozoisite, 11 percent; epidote, 4 percent; calcite, 2 percent; pyrite,

chalcopyrite, limonite, and quartz, 3 percent. Muscovite and biotite

are conspicuously absent from these greenschists.

Quartzite and limestone, although quantitatively minor parts

of the section, form the only mappable units within the Pelona schist.

The quartzite beds, two to ten feet thick, are composed of individual

layers of nearly pure quartzite that are less than one inch thick. The

layers are separated by thin, gray-green laminae that are micaceous

and calcareous. These quartzites are extremely rare in the lower

one-third of the exposed schist section.

The limestone is bluish gray, and forms beds that range 1n

thickness from one-quarter of an inch to several feet. These are

separated by quartzite layers less than one inch thick. Layers of

actinolite-chlorite schist one to five feet thick also are present. The

limestones and interbedded quartzites are so intricately contorted that

stratigraphic thicknesses cannot be determined, even where the out-

crop thickness is nearly 100 feet. The limestones invariably are inter-

bedded with quartzite, and some with actinolite-chlorite schist. The

thickest of the lime stone beds are consistently the mo st highly con-

torted. One of these contorted areas is illustrated in Figure 2.

Scattered grains of quartz occur in the lime stone beds, and graphite

also is present in small amounts. The quartzite beds are cemented

with calcite.