The Middle Ordovician bathyurid trilobite Pseudoolenoides, with a revised trilobite biostratigraphy of the Dapingian and lower Darriwilian of western Laurentia

  title={The Middle Ordovician bathyurid trilobite Pseudoolenoides, with a revised trilobite biostratigraphy of the Dapingian and lower Darriwilian of western Laurentia},
  author={Jonathan M. Adrain and Neo E.B. McAdams and Talia S. KarimT.S. Karim},
The Middle Ordovician bathyurid trilobite Pseudoolenoides Hintze has been treated in only a small handful of papers andfew of its species have been adequately known. Here we revise all previously known species on the basis of new materialand illustrations, and describe four new species, three of which are formally named. The genus now comprises 10 species,nine of which are formally named. Five of these are Dapingian and five are early Darriwilian in age. Cladistic parsimonyanalysis of the nine… 

Revision of the Early Ordovician (late Tremadocian; Stairsian) cheirurid trilobite Tesselacauda Ross, with species from the Great Basin, western USA.

Tesselacauda is clearly a cheirurid, assigned for the present to the presumptively basal and possibly paraphyletic Subfamily Pilekiinae.

Phylogenetic Analysis and Revision of the Trilobite Subfamily Balnibarbiinae (Olenidae)

Results of phylogenetic analyses of the Balnibarbiinae subfamily using both parsimony and Bayesian methods are consistent with a previous hypothesis based on phyletic similarity and stratigraphic range and expand the geographic range of the subfamily to Alaska.

An integrated trilobite and conodont biostratigraphy across the base of the Laurentian Whiterockian Series (lower Middle Ordovician) at its stratotype, Whiterock Canyon Narrows, Nevada

Abstract. The outcrop at Whiterock Canyon Narrows, Nevada, is the stratotype for the Middle Ordovician Whiterockian Series in Laurentia. Contrasts in the distribution of trilobites and conodonts

The trouble with trilobites: classification, phylogeny and the cryptogenesis problem

Abstract Trilobites are an iconic group of extinct arthropods that lived in Palaeozoic oceans for c. 270 Ma, before their demise at the end of the Permian Period. Despite their considerable diversity

Diversity patterns and palaeoecology of benthic communities of the Kanosh Formation (Pogonip Group, Utah, western USA)

  • R. HofmannJ. Kehl
  • Environmental Science, Geography
    Palaeobiodiversity and Palaeoenvironments
  • 2020
The Dapingian to Darriwilian Kanosh Formation is one of the most fossiliferous units of the Pogonip Group (Great Basin, western US). It records a critical phase of the so-called Great Ordovician

Trilobite biostratigraphy of the Stairsian Stage (upper Tremadocian) of the Ibexian Series, Lower Ordovician, western United States

New field collections from sections in western Utah and southeastern Idaho permit the development of a high resolution trilobite biostratigraphy for the northern Laurentian Lower Ordovician (upper



Trilobite Biostratigraphy and Revised Bases of the Tulean and Blackhillsian Stages of the Ibexian Series, Lower Ordovician, Western United States

Extensive new field collections and taxonomic work permit the development of a much higher resolution trilobite biostratigraphy for the Lower Ordovician Tulean and Blackhillsian stages of western

Systematics and affinity of the Lower Ordovician (Tulean; lower Floian) trilobite 'Psalikilopsis'

THE MONOGRAPHS of Ross (1951) and Hintze (1953) on Lower Ordovician trilobite faunas from the Great Basin included a number of new genera of uncertain systematic affinity. Many of these have remained

Trilobites at the base of the Middle Ordovician, western United States

Sections in the Basin Ranges provide stratigraphic standards for the Ordovician of the U.S., from which zones based on trilobites have been widely employed in regional correlation. This paper

Trilobites from the base of the type Whiterockian (Middle Ordovician) in Nevada

No trilobite species, and very few genera, pass from the Lower (Ibexian) into the Middle Ordovician (Whiterockian), which is a turning point in Laurentian trilobite history. Trilobites from three

Simpson Group (Middle Ordovician) Trilobites of Oklahoma

  • F. C. Shaw
  • Geology, Environmental Science
    Journal of Paleontology
  • 1974
The Middle Ordovician Simpson Group of southern Oklahoma consists of an exceptionally continuous record of carbonates, shales and quartz sandstones which accumulated in a shallow shelf environment.

Available generic names for trilobites

Aconsolidated list of available generic names introduced since the beginning of the binomial nomenclature system for trilobites is presented for the first time. Each entry is accompanied by the

Definition of a global boundary stratotype for the Darriwilian Stage of the Ordovician System

The International Commission on Stratigraphic Nomenclature and the IUGS Executive Committee have recently approved selection of a global stratotype section and point defining the base of the second

A new Lower Ordovician species of Calathium, and skeletal structure of western Utah calathids

  • S. Church
  • Environmental Science
    Journal of Paleontology
  • 1991
Conical and vase-shaped calathids are found in the Lower Ordovician Fillmore Formation of western Utah associated with intraformational conglomerates and small patch reefs. Calathium yersini n. sp.

Conodonts and Conodont Biostratigrapy of the Joins and Oil Creek Formations, Arbuckle Mountains, South-central Oklahoma

— More than 63,000 conodont specimens were recovered from 112 samples collected from the Joins and Oil Creek Formations of south-central Oklahoma (Figure 1). The bulk of those specimens are

Stratotype of Ordovician Whiterock Series

Here the authors reaffirm and document fossil ranges at the stratotype section for the base of the Whiterock Series in Whiterock Canyon, northern Monitor Range, Nevada, and designate a reference