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GEOREF RECORD

Ceratopsid dinosaurs from the Upper Cretaceous Almond Formation of southwestern Wyoming

Andrew A. Farke
Ceratopsid dinosaurs from the Upper Cretaceous Almond Formation of southwestern Wyoming
Rocky Mountain Geology (2004) 39 (1): 1-5

Abstract

The 1937 American Museum of Natural History (AMNH)-Sinclair Oil Company joint expedition to the late Campanian and early Maastrichtian Almond Formation of the Rock Springs Uplift, southern Wyoming, recovered two ceratopsid cranial specimens. AMNH 3652, a partial skull lacking the frill, is characterized by elongate, procurving postorbital horns and a deep rostrum. Although the specimen cannot be identified to the generic or specific level, it appears to be closely related to the clade of chasmosaurine ceratopsids including Anchiceratops, Arrhinoceratops, Diceratops, Torosaurus, and Triceratops, exclusive of Pentaceratops and Chasmosaurus. AMNH 3656, a frill fragment, is characterized by large, triangular marginal processes and an average thickness in excess of 40 mm. This specimen is similar to previously reported frills from Anchiceratops. The ceratopsid specimens from the Almond Formation are significant because they represent two early occurrences of chasmosaurine ceratopsids as well as a unique occurrence in southern Wyoming.


ISSN: 1555-7332
EISSN: 1555-7340
Coden: WUGGAO
Serial Title: Rocky Mountain Geology
Serial Volume: 39
Serial Issue: 1
Title: Ceratopsid dinosaurs from the Upper Cretaceous Almond Formation of southwestern Wyoming
Author(s): Farke, Andrew A.
Affiliation: South Dakota School of Mines and Technology, Museum of Geology, Rapid City, SD, United States
Pages: 1-5
Published: 2004
Text Language: English
Publisher: University of Wyoming, Dept. of Geology and Geophysics, Laramie, WY, United States
References: 12
Accession Number: 2005-011150
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N41°00'00" - N42°19'60", W110°10'00" - W107°30'00"
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200505
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