Title
Description of two species of Hoploscaphites (Ammonoidea, Ancyloceratina) from the Upper Cretaceous (Lower Maastrichtian) of the U.S. Western Interior
Title Variants
Alternative:
Two species of Hoploscaphites
Related Titles
Series:
Bulletin of the American Museum of Natural History, number 427
By
Landman, Neil H.
, author
Kennedy, W. J. (William James)
, author
Larson, Neal L.
, author
Grier, Joyce C.
, author
Grier, James W.
, author
Linn, Tom.
, author
Type
Book
Material
Published material
Publication info
New York, NY, American Museum of Natural History, [2019]
Notes
"Issued February 22, 2019."
Local PDF available in high- and low-resolution versions.
Two species of scaphitid ammonites (Ammonoidea: Ancyloceratina) from the Upper Cretaceous (lower Maastrichtian) of the Western Interior of North America are described. Hoploscaphites macer, n. sp., is medium size, with coarse ribs on the phragmocone, which become finer on the body chamber, and closely spaced ventrolateral tubercles. It occurs in the upper part of the Baculites baculus Zone and lower part of the overlying B. grandis Zone in the Pierre Shale in Montana, Wyoming, and Colorado, and in the Bearpaw Shale in Montana. Hoploscaphites criptonodosus (Riccardi, 1983) is larger and more coarsely ornamented, including one or two rows of lateral tubercles on the flanks of the phragmocone. It occurs in the upper part of the Baculites baculus Zone and overlying B. grandis Zone in the Pierre Shale in Montana, Wyoming, Colorado, and possibly South Dakota, and in the Bearpaw Shale in Montana and Saskatchewan, Canada. Both species form part of an evolving lineage of Hoploscaphites that first appears in the Western Interior of North America in the middle Campanian.
Subjects
Ammonoidea
,
Bearpaw Formation
,
Cretaceous
,
Great Plains
,
Hoploscaphites criptonodosus
,
Hoploscaphites macer
,
Mollusks, Fossil
,
Paleontology
,
Pierre Shale
,
Saskatchewan
,
West (U.S.)
Call Number
QH1 .A4 no.427 2019
Language
English
Identifiers
DOI:
https://doi.org/10.1206/0003-0090.427.1.1
OCLC:
1087505935
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