FOUNTAIN
Exposure: No
significant surface exposures along trail.
Age:
Pennsylvanian and early Permian
Lithology: Red arkoses, sandy mudstones and conglomerates,
crossbedding common
Depositional Environment: a complex of shallow braided channels
deposited on alluvial fans
LYONS
Exposure: Forms a
fairly prominent ridge bisecting park
Age: Permian
Lithology: "..light gray conglomerate arkose...overlain by cross-
stratified conglomerate tat grads upward into fine- to
medium-grained feldspathic sandstone."*
Depositional Environment: Braided stream deposits grading
upward into eolian deposits and dunes
LYKINS
Exposure: Less
resistant than the Lyons, but more than the
Fountain. Some low exposures.
Age: Permian
Lithology: "...brick-red, thinly bedded siltstone and shales.
Two
crinkly laminated carbonates layers .. are present in the
lower 100 feet..."*
Depositional Environment: "a nonmarine aqueous deposit, either
related to widespread supersaline restricted marine, or
to saline freshwater lake conditions."*