Geologic Map of the Maysville Quadrangle, Chaffee County, Colorado

as rockfalls, rock avalanches, rock topples, and rockslides. Downslope movement may
have been locally aided by water and freeze-thaw action. Unit typically lacks matrix
material near the surface, but dissected talus reveal significant matrix at depth. Lack of
surface vegetation indicates that rubble deposition is continuing in modern times.
Thickness is probably less than 33 feet. Talus areas are subject to rockfall, rock-topple,
and rockslide hazards.
Qti Talus deposits, inactive (Holocene) – Angular, cobbly and bouldery rubble as
much as 6 ft in diameter. Mapped only northwest of the summit of Mount Shavano and in
the North Fork near the western quadrangle boundary. Deposits are derived from bedrock
that was transported downslope by gravity principally as rockfalls, rock avalanches, rock
topples, and rockslides. Downslope movement may have been locally aided by water and
freeze-thaw action. Unit typically lacks matrix material near the surface, but dissected
talus reveal significant matrix at depth. Limited surface vegetation indicates that rubble
deposition is no longer continuing in modern times. Thickness is probably less than 33
feet. May be subject to rockfall, rock-topple, and rockslide hazards in extreme events
(storms, earthquakes).
Qtf Talus fan deposits, undivided (Holocene) – Angular, cobbly and bouldery
rubble as much as 6 ft in diameter deposited in steep cones marked by a prominent axial
gully. Mapped in cirques of both branches of Squaw Creek. Deposits are derived from
bedrock that was transported downslope by both rockfalls and debris flows. Axial gully
is typically flanked by prominent debris-flow levees. Unit typically lacks matrix material
near the surface, but dissected talus reveal significant matrix at depth. Unvegetated
surface indicates that unit has received recent active deposition. Thickness is probably
less than 15 feet. Talus fan areas are subject to rockfall and debris flows.
Qtfo Talus fan deposits, older (late Pleistocene and Holocene) – Angular, cobbly
and bouldery rubble as much as 6 ft in diameter deposited in steep cones marked by a
prominent axial gully. Mapped in only one location, in the cirque of the western branch
of Squaw Creek. Deposits are derived from bedrock that was transported downslope by
45