Contributions to the geology and paleontology of San Juan County, New Mexico: 1. Stratigraphy of a part of the Chaco River valley

Abstract

Coal bed is overlain by peculiarl y weathered gray-white sandstone. Flat in foreground underlain by shale. View looking southeastward.

Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico

“…Trigonometric calculations place the locality at~83 m stratigraphically above ash 2, and~48 m stratigraphically below ash 4 (based on a northeast dip of 1 ). This agrees quite well with Bauer (1916) who published a thickness of 1,031 feet (314 m) for the Hunter Wash Member (then called the Lower Shale Member) at Hunter Wash itself. However, in their description of the ashes, Fassett & Steiner (1997) suggest that the ashes are separated stratigraphically by only~45 m. This would appear to be an underestimate, based on both Bauer (1916) and on the fact that ash 4 is~130 ft (40 m) topographically higher than ash 2, and~5 km NE (basinwards, parallel to 1-3 dip).…”

Peer Review #3 of "Transitional evolutionary forms in chasmosaurine ceratopsid dinosaurs: evidence from the Campanian of New Mexico (v0.1)"

“…Trigonometric calculations place the locality at ~83 m stratigraphically above ash 2, and ~48 m stratigraphically below ash 4 (based on a northeast dip of 1°). This agrees quite well with Bauer (1916) who published a thickness of 1031 feet (314 m) for the Hunter Wash Member (then called the Lower Shale Member) at Hunter Wash itself.…”

“…However, in their description of the ashes, Fassett and Steiner (1997) suggest that the ashes are separated stratigraphically by only ~45 m. This would appear to be an underestimate, based on both Bauer (1916) and on the fact that ash 4 is ~130 ft (40 m) topographically higher than ash 2, and ~5 km NE (basinwards, parallel to 1-3° dip).…”

Redescription of the Ceratopsid Dinosaur Torosaurus Utahensis (Gilmore, 1946) and a Revision of the Genus

“…The specimen, ac cording to Lehman (1993: 287), was believed to be from the Naashoibito Member. However, the squamosal is covered with a distinct hematitic veneer that is commonly found on bones from the De-na-zin Member, suggesting that it is from the Kirtland Formation rather than the lower part of the Ojo Alamo Formation (sensu Bauer, 1916). Moreover, the taxonomic identification is also questionable (illustrated by Lehman, 1981 : text-fig.…”