This waterfall on the Grinnell Glacier trail was a welcome rest stop. Water attracts both large (us) and small mammals and a variety of plant life. We cooled ourselves in the water and admired the view of Grinnell Falls ahead.
Red and green argillite, sometimes called siltstone, boulders, sedimentary rocks, the dominant type in the park, are intermixed here. Red and green are made of the same materials. The color reflects the conditions under which the rock was formed. In the presence of oxygen the iron in the mix, about 3%, oxidized, rusted, imparting the red coloration. The green argillite results from rock formed in the absence of oxygen.