Santonian (Late
Cretaceous) Cephalopods
Santonian age cephalopods occur in the Emery
Sandstone Member of the Mancos Shale. The Garley
Canyon Beds and
the Lower Emery Beds south from Huntington are where the fossils
pictured below were found. These rocks were deposited in the Sevier
Foreland Basin.
References: Reeside,
J. B., Jr., 1927, The Cephalopods of the Eagle Sandstone and Related
Formations in the Western Interior of the United States, U.S.G.S.
Professional Paper 151; Cobban, W. A.,
1951, Scaphitoid Cephalopods of the Colorado Group, U.S.G.S.
Professional Paper 239; Cobban, W. A., 1976, Ammonite
Record from the Mancos Shale of the Castle Valley-Price-Woodside Area,
East-Central Utah, B.Y.U. Geology Studies Vol.22, Pt.3.
A large Placenticeras syrtale
(Morton) 1834, at the outcrop
Clioscaphites vermiformis (Meek
& Hayden) 1862
Baculites
codyensis Reeside 1927
Texanites ?texanus (Roemer) 1852
217mm dia.
Placenticeras syrtale (Morton)
1834, ?male dimorph
formerly refered to
P. guadalupae
(Roemer) 1952
511mm diameter
Placenticeras syrtale (Morton)
1834, ?female dimorph
formerly refered to
P. planum
Hyatt 1903
530mm diameter
Typical fossil cephalopods from the Lower
Emery Sandstone
and Garley Canyon Beds
Placenticeras syrtale (Morton)
1834,
is the common ammonite
Clioscaphites vermiformis (Meek
& Hayden) 1862, Top Center, Eutrephoceras alcesense Reeside
1927, Bottom Center
Baculites codyensis Reeside 1927,
Lower Left.
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