Glacier is visible half-way up the Grinnell Glacier Trail, above the waterfall
from both glaciers and their snowfields. The snout of the Salamander marks
a dark diorite sill, a horizontal volcanic
layer intruded between the limestone layers that make up the high continental
divide. The white lines bordering the sill are marble,
or metamorphosed limestone, converted from limestone to marble by the intense
heat of the diorite as it cooled.
© Gregory G. and Mary Beth Dimijian