| The Clarno Unit is on Route 218 about a dozen miles west of
the town of Fossil, Oregon. The small park unit incorporates bluffs of volcanic tuff (ash beds) and basalt flows the lower John Day Formation.
The beds overlie tuffaceous sediments rich in fossil plant materials (including
the Clarno Nut Beds) as well as fish, mammals, and other vertebrate fauna,
and ichnofauna (traces in sediment left by living organisms including such
features as crayfish burrows, foot prints, root traces, and other invertebrate
tracks and traces) (Fremd and others, 1994; Bestland and others, 1999; Bestland and others, 2002). |
