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Willwood Formation
The
Willwood Formation
is a sedimentary sequence deposited during the late
Paleocene
to early
Eocene
. It consists of fine grained clastic rocks (
mudstone
and
shale
) interbeded with medium grained clastic rocks (
sandstone
) and sporadic
conglomerates
. The formation underlies portions of the
Bighorn Basin
of
Big Horn
,
Hot Springs
,
Park
and
Washakie
counties of
Wyoming
.
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