Evolutionary, Ecologic, and Geographic Observations on Conodonts During Their Decline and Extinction

Mosher, Lindsay

doi:10.1130/spe141-p143

Cited by 7 publications

(6 citation statements)

References 27 publications

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“…This same relationship has been noted by many other conodont workers (Mosher, 1970(Mosher, , 1972Orchard, 1983).…”

Section: Basinal Terranesupporting

confidence: 82%

Conodonts from the Norian (Upper Triassic) basin and shelf facies, northwestern Nevada

Meek

1984

Geological Society of America Special Papers

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Norian (Upper Triassic) sediments in western Nevada were deposited in a westfacing successor basin which was formed following the collision of the microcontinent Sonomia in the Late Paleozoic. These strata were deposited on a shelf and in a deep basin and consist of siliciclastic sandy and pelitic strata with interbedded carbonate strata.Conodonts of the genus Epigondolella are common in the basinal strata but are rarely found in carbonates deposited on the shelf. This suggests that Epigondolella may have been facies selective. The trace fossils, Cruziana, Planolites, Skolithos, and Cylindrichnus, are present in sandstone deposited on the shelf and coupled with other sedimentologic data indicate shallow marine environments of deposition. Basinal rocks consist of distal turbidite and hemipelagite in the basal portion but in the upper part suggest shoaling. Carbonate-platform deposits cap the sequence and indicate that the basin was filled to near sea level. Epigondolella is present in both the basinal thinbedded carbonates and in the more massive platform carbonates.Eight Epigondolella associations have been recognized elsewhere in the Norian and have been related biostratigraphically to the standard ammonoid zonation. Conodont elements representing five of these associations are recognized and have been useful for correlation of strata between the shelf and basinal lithofacies when coupled with other biostratigraphic data.

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“…This same relationship has been noted by many other conodont workers (Mosher, 1970(Mosher, , 1972Orchard, 1983).…”

Section: Basinal Terranesupporting

confidence: 82%

Conodonts from the Norian (Upper Triassic) basin and shelf facies, northwestern Nevada

Meek

1984

Geological Society of America Special Papers

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“…Gould, 1977;McNamara, 1986) suggests that conodonts may offer much of relevance to this area of evolutionary biology as well (e.g. Mosher, 1973;Broadhead, 1983;Broadhead and McComb, 1983).…”

Section: Discussionmentioning

confidence: 99%

Conodont palaeobiology: recent progress and unsolved problems

Morris

1989

Terra Nova

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The fossilized soft-parts of conodonts are extraordinarily rare; excluding dubious and refuted examples, only 10 specimens are known. Nine come from the Lower Carboniferous of Granton, Scotland, and represent at least two genera with complex polygnathacean apparatuses. The soft-parts include well-defined myotomal segmentation and a probable notochord, thus strongly suggesting affinity with the chordates. The tenth specimen, from the Lower Silurian of Waukesha, Wisconsin, bears a simpler apparatus of panderodontid conodont elements. The soft-parts are very poorly preserved, but appear to be unlike those of the'Granton specimens. In both occurrences the conodont apparatus appears well adapted for grasping and biting, supporting earlier suggestions that conodont elements acted as teeth. Many conodonts were probably predators or scavengers, but other feeding modes are not necessarily excluded. Other aspects ofconodont palaeobiology reviewed here include mode of life and possible migration, reproduction and genetics, and palaeopathology. All these topics rely almost exclusively on the REFERENCES Aldridge R.

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“…haslachensis and Celsigondolella watznaueri are believed to be endemic for the Germanic Basin (Hirsch ; Budurov and Petrunova ; Narkiewicz and Szulc ). Earlier use of the species name Neogondolella mombergensis in North American records (Mosher ; Nicora and Kovacs ; Ritter ) is erroneous.…”

Section: Conodont Provincialismmentioning

confidence: 99%

“…Elements of their phosphatic feeding apparatus, which are usually 0.1–4 mm in size, can be found in marine sediments with an age range from Cambrian to Triassic. They are an excellent group for stratigraphical purposes (Mosher ), and their importance has been further enhanced in four ways: applications of colour alteration indices (Epstein et al . ; Rejebian et al .…”

mentioning

confidence: 99%

A review of the evolution, biostratigraphy, provincialism and diversity of Middle and early Late Triassic conodonts

Chen

Krystyn

Orchard

et al. 2015

Papers in Palaeontology

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The taxonomy, diversity, evolutionary lineages, and stratigraphical distributions of Middle and early Late Triassic conodonts are reviewed and re-evaluated. Twentyfive genera are recognized in the Middle and early Late Triassic, including a new genus cited in open nomenclature. Of these, 24 genera are assigned to two families and seven subfamilies. The family Gondolellidae consists of the subfamilies Cornudininae, Epigondolellinae, Neogondolellinae, Novispathodinae, Paragondolellinae and Pseudofurnishiinae. The family Gladigondolellidae is monotypic, consisting of the subfamily Gladigondolellinae. The genus Neostrachanognathus is not assigned to any family or subfamily as its origin is unclear. Conodont provincialism was low in the early Anisian, but from the late Anisian faunistic differences started to increase and became stronger during the early Ladinian, reaching a peak around the mid-Ladinian. Provincialism remained strong until the earliest Carnian and changed to an all-Triassic low in the early Tuvalian. The provincialism between North America and Tethys rebounded on the specific level during the late Tuvalian. Diversities on generic and specific levels have been established, and two major conodont diversity cycles are recognized: the first ranges from the Bithynian (early Anisian) to the Julian (late early Carnian), and the second is restricted to the Tuvalian (late Carnian).

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Evolutionary, Ecologic, and Geographic Observations on Conodonts During Their Decline and Extinction

Cited by 7 publications

References 27 publications

Conodonts from the Norian (Upper Triassic) basin and shelf facies, northwestern Nevada

Conodonts from the Norian (Upper Triassic) basin and shelf facies, northwestern Nevada

Conodont palaeobiology: recent progress and unsolved problems

A review of the evolution, biostratigraphy, provincialism and diversity of Middle and early Late Triassic conodonts

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