Some Middle Ordovician brachiopods and trilobites from the Basin Ranges, western United States

Ross, Reuben James; Barnes, Harley

doi:10.3133/pp523d

Cited by 36 publications

(56 citation statements)

References 5 publications

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“…Fillmore Formation, approximately 52´7 m above the base of Hintze's (1951Hintze's ( , 1953) Section G. Ibex Series, Hintze's Zone F ( Rossaspis superciliosa Zone; Ross et al 1997). This sample probably equates with Hintze's (1951) sample G-5.…”

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

“…1, ®gs 18±20, 23±24, 28±31) from a level about 179´3 m above the base of Hintze's Section H corresponding to the latter's sample H-20. Ibex Series, Fillmore Formation, Zone H ( Trigonocerca typica Zone; Ross et al 1997) Ross et al 1997). This is Hintze's sample J-2 (L. F. Hintze, pers.…”

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

“…It has been known for ®fty years and yielded many of the specimens for Hintze's (1953) classic study of silici®ed lower Ordovician trilobites. Recently (Ross et al 1997), Ibex has been made type section for the lower Ordovician Ibexian Series, and the co-occurrence of trilobites, conodonts, brachiopods and graptolites has been documented. These various faunas allow for international correlation with other Geological column redrawn after Hintze (1973). sections.…”

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

“…Hintze's (1953) Carolinites sp. A is the stratigraphically earliest known Carolinites, coming from Hintze's shelly fossil Zone G-2 at Ibex ( Protopliomerella contracta Zone of Ross et al 1997) (Text-®g. 2E±F).…”

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

“…20, ®gs 2A±C) from his sample D-11. Ibex Series, Fillmore Formation, Hintze's Zone G-2 ( Protopliomerella contracta Zone; Ross et al 1997).…”

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

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The Ordovician Trilobite Carolinites, A Test Case for Microevolution in A Macrofossil Lineage

McCormick¹,

Fortey

2002

Palaeontology

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ABSTRACT. We use geometric morphometrics to test a claim that the Ordovician trilobite Carolinites exhibits gradualistic evolution. We follow a previously proposed de®nition of gradualism, and de®ne the criteria an ideal microevolutionary case study should satisfy. We consider the Lower±Middle Ordovician succession at Ibex, western Utah to meet these criteria. We discovered examples of: (1) morphometric characters which¯uctuate with little or no net change; (2) characters which show abrupt`step' change; (3) characters which show transitional change through intermediate states. Examples belonging to (2) and (3) exhibit reversals. The transitional characters were tested against a null hypothesis of symmetrical random walk. The tests indicated that they were not changing under sustained directional selection. Two alternative interpretations are possible. (1) The characters are responding to random causes (genetic drift or rapidly¯uctuating selection pressures) or to causes that interact in so complex a way that they appear random. This observation may be applicable to most claimed cases of gradualistic evolution in the literature. (2) Sampling was at too poor a resolution to allow meaningful testing against the random walk. If so, then this situation is likely to apply in most evolutionary case studies involving Palaeozoic macrofossils.

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Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

“…20, ®gs 2A±C) from his sample D-11. Ibex Series, Fillmore Formation, Hintze's Zone G-2 ( Protopliomerella contracta Zone; Ross et al 1997).…”

Section: T H E I B E X I a N ± W H I T E R O C K I A N S E C T I O N mentioning

confidence: 99%

See 3 more Smart Citations

The Ordovician Trilobite Carolinites, A Test Case for Microevolution in A Macrofossil Lineage

McCormick¹,

Fortey

2002

Palaeontology

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The Middle–Late Ordovician brachiopod Plectorthis from North America and its paleobiogeographic significance

Sproat

Jin

2016

Palaeoworld

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The Upper Ordovician trilobiteRaymonditesSinclair, 1944 in North America

Swisher¹,

Westrop²,

Amati³

2015

J. Paleontol.

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The Upper Ordovician (Sandbian–Katian) bathyurid trilobite Raymondites Sinclair is revised using new collections from Missouri and Ontario, and archival material from Illinois, Wisconsin, New York, and Ontario. Phylogenetic analysis supports monophyly of Raymondites, but recognition of this genus renders Bathyurus Billings paraphyletic. We treat Raymondites as a subgenus of Bathyurus and label the paraphylum of species traditionally assigned to the latter as Bathyurus sensu lato. Bathyurus (Raymondites) is composed of five previously named species, B. (R.) spiniger (Hall), B. (R.) longispinus (Walcott), B. (R.) ingalli (Raymond), B. (R.) bandifer Sinclair, and B. (R.) trispinosus (Wilson), and two new species, B. (R.) clochensis, and B. (R.) missouriensis; an eighth species is placed in open nomenclature. All species share tuberculate sculpture on the glabella, a relatively short palpebral lobe whose length is less than half of preoccipital glabellar length, and a pygidial outline that is well rounded posteriorly. Aside from the most basal species, B. (R.) longispinus, they also possess occipital spines and, where the pygidium is known, axial pygidial spines.

show abstract

Some Middle Ordovician brachiopods and trilobites from the Basin Ranges, western United States

Cited by 36 publications

References 5 publications

The Ordovician Trilobite Carolinites, A Test Case for Microevolution in A Macrofossil Lineage

The Ordovician Trilobite Carolinites, A Test Case for Microevolution in A Macrofossil Lineage

The Middle–Late Ordovician brachiopod Plectorthis from North America and its paleobiogeographic significance

The Upper Ordovician trilobiteRaymonditesSinclair, 1944 in North America

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