Coryphodon (Mammalia, Pantodonta) From the Hannold Hill Formation, Eocene of Trans-Pecos Texas

Contents: Abstract -- Introduction -- Abbreviations -- Geological Context -- Systematic Paleontology -- Paleobiological Implications of Hannold Hill Coryphodon -- Age of Hannold Hill Formation -- Literature CitedSpeciments of the large extinct pantodont Coryphodon from the Hannold Hill Formation, Brewster County, Texas belong to single species, Coryphodon molestus. A sample of Coryphodon molestus from one locality in the Hannold Hill Formations consists of three adults and at least one juvenille. The sample aids in documenting sexual dimorphism in Coryphodon molestus and provides circumstantial evidence of gregarious behavior in that species. The presence of Coyphodon molestus in the Hannold Hill Formation indicates a late Gray Bull through Lost Cabin (Wasatchian) age. This is consistent with assignment of a late Gray Bull or Lysite age to the entire Hannold Hill vertebrate fauna.Texas Memorial Museu

Taxonomic status of Eohyus Marsh, 1894

In 1977 Marsh mentioned Eohyus as the oldest known artiodactyl but failed to describe or illustrate a type specimen, and thus Eohyus was for many years anomen nudum. The validity of its two species, E. distans and E. robustus, both named by Marsh in 1894, has been the subject of numerous and often conflicting opinions. Reexamination of the type specimens reveals that E. distans is a subjective synonym of Phenacodus primaevus Cope, 1873, and E. robustus is a subjective synonym of Periptychus carinidens Cope, 1881. The type of E. distans is from early Eocene (Wasatchian) age strata of the San Jose Formation, San Juan Basin, New Mexico; that of E. robustus is from middle Paleocene (Torrejonian) age strata of the Nacimiento Formation, also in the San Juan Basin

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In Galois theory one is interested in finding a polynomial over a field that has a given Galois group. A more desirable polynomial is one that parametrizes all such polynomials with that given group as its corresponding Galois group. These are called generic polynomials and we provide detailed proofs of two theorems that give methods for constructing such polynomials. Furthermore, we construct generic polynomials for Sn, C3, V , C4, C6, D3, D4, and D6

Remaking Apprenticeships: powerful learning for work and life.

This report – Remaking Apprenticeships – commissioned by City & Guilds, reviews the research into the pedagogy of apprenticeships. It makes an argument for putting learning back at the heart of apprenticeships in England and elsewhere.\ud \ud Remaking Apprenticeships traces the history of apprenticeships in order to make sure that knowledge of the past informs thinking today. It describes the elements of a pedagogy of apprenticeships. It explains why how an apprentice learns and who they learn with – the culture within which their vocational formation occurs – is at least as important as what they learn.\ud It identifies three core dimensions of apprenticeship learning

The first tooth set of Ptychodus atcoensis (Elasmobranchii: Ptychodontidae), from the Cretaceous of Venezuela

Ptychodus atcoensis is a characteristic Late Cretaceous durophagous shark, with a fossil record that was previously known exclusively from the Coniacian Atco Formation in Texas, USA, North America. We illustrate and describe for the first time a partial articulated tooth set of P. atcoensis, from the Cretaceous of the Venezuelan Andes, representing the only known record of this species outside of North America, thus significantly increasing the palaeobiogeographic distribution of this taxon. This partial tooth set also documents characteristic variation in the teeth of P. atcoensis that will allow isolated teeth of the species to be more readily identified and located in the dentitio

MICROFACIES AND MICROFOSSIL ASSEMBLAGES (SMALLER FORAMINIFERS, ALGAE, PSEUDOALGAE) OF THE HUECO GROUP AND LABORCITA FORMATION (UPPER PENNSYLVANIAN-LOWER PERMIAN) SOUTH-CENTRAL NEW MEXICO, USA

During the latest Carboniferous and earliest Permian (Virgilian-Wolfcampian), the eastern margin of the Orogrande Basin in south-central New Mexico was rimmed by a narrow, tectonically unstable shelf, on which sediments of the Laborcita and Abo formations were deposited. Sediments of the Hueco Group accumulated on the more stable western margin of the Orogrande Basin. On the eastern shelf, the Laborcita Formation of the northern Sacramento Mountains represents a transition from marine to terrestrial facies and is composed of clastic-carbonate cycles. Limestones accumulated during relative sea-level highstands in a shallow marine shelf environment. Clastic sediments were deposited during relative lowstands when there was strong clastic influx in a nearshore to terrestrial environment. The overlying Abo Formation is composed of terrestrial red beds. On the western shelf, the Shalem Colony Formation of the Hueco Group, equivalent to the Laborcita Formation, is composed of mostly normal marine shallow shelf limestones with only minor interbedded clastics. The Robledo Mountains Formation and Hueco Group reflects a trend from a restricted shallow  shelf and tidal flat clastics facies in the lower part to more open conditions in the upper part, which also prevailed during deposition of the overlying Apache Dam Formation. Limestones of the Laborcita Formation and Hueco Group contain smaller foraminifers, algae and problematic carbonate microfossils. All taxa except two pseudoalgae in open nomenclature (Litostroma (?) sp. and “problematicum gen. 1”) are taxa already described. Compared with the Carnic Alps (Austria/Italy), the assemblages of smaller foraminifers of the Laborcita Formation  and Shalem Colony Formation are very similar to those of the Auernig and Carnizza Formations (Auernig Group), and Lower Pseudoschwagerina Limestone (Rattendorf Group), indicating an Orenbugian (“Bursumian”) to Asselian age. Smaller foraminifers of the Robledo Mountains Formation allow correlation with the Grenzland Formation and Upper Pseudoschwagerina Limestone (Rattendorf Group) of the Carnic Alps, dated as Asselian to Sakmarian. Smaller foraminifers of the Apache Dam Formation suggest an Artinskian age, correlating with the Wolfcampian, or the Trogkofel Group of the Carnic Alps.  &nbsp