Miles of its flanks are reeking and bubbling with hot
springs, many of them so boisterous and sulphurous they seem over ready
to become spouting geysers like those of the Yellowstone.
The Cinder Cone near marks the most recent volcanic eruption in the
Sierra. It is a symmetrical truncated cone about 700 feet high, covered
with gray cinders and ashes, and has a regular unchanged crater on its
summit, in which a few small Two-leaved Pines are growing. These show
that the age of the cone is not less than eighty years. It stands
between two lakes, which a short time ago were one. Before the cone was
built, a flood of rough vesicular lava was poured into the lake, cutting
it in two, and, overflowing its banks, the fiery flood advanced into the
pine-woods, overwhelming the trees in its way, the charred ends of some
of which may still be seen projecting from beneath the snout of the
lava-stream where it came to rest. Later still there was an eruption of
ashes and loose obsidian cinders, probably from the same vent, which,
besides forming the Cinder Cone, scattered a heavy shower over the
surrounding woods for miles to a depth of from six inches to several
feet.
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