Idiognathoides

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Idiognathoides
Temporal range: Bashkirian–Moscovian
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Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class:†Conodonta
Genus:†Idiognathoides
Harris and Hollingsworth, 1933 [1]
Species
  • †Idiognathoides luokunensis
  • †Idiognathoides postsulcatus
  • †Idiognathoides sinuatus (syn. I. sinuata)
  • †Idiognathoides sulcata

Idiognathoides is an extinct genus of conodonts.

Glen K. Merrill stated in 1963 that "conodont workers have considered Idiognathoides to be a junior synonym of Polygnathodella but it now proves to be a junior synonym of Cavusgnathus . Polygnathodella and Cavusgnathus are shown to form a transitional series." [2]

Polygnathodella is an extinct genus of conodont.

<i>Cavusgnathus</i> genus of conodonts

Cavusgnathus is an extinct genus of conodonts.

Contents

Use in stratigraphy

The Bashkirian, the oldest age of the Pennsylvanian (also known as Upper Carboniferous), contains six biozones based on conodont index fossils, one of which contains an Idiognathoides species : the zone of Idiognathoides sinuatus.

The Bashkirian is in the ICS geologic timescale the lowest stage or oldest age of the Pennsylvanian. The Bashkirian age lasted from 323.2 to 315.2 Ma, is preceded by the Serpukhovian and is followed by the Moscovian.

The Pennsylvanian is, in the ICS geologic timescale, the younger of two subperiods of the Carboniferous Period. It lasted from roughly 323.2 million years ago to 298.9 million years ago Ma. As with most other geochronologic units, the rock beds that define the Pennsylvanian are well identified, but the exact date of the start and end are uncertain by a few hundred thousand years. The Pennsylvanian is named after the U.S. state of Pennsylvania, where the coal-productive beds of this age are widespread.

The base of the Moscovian, the second stage in the Pennsylvanian, is close to the first appearances of the conodonts Declinognathodus donetzianus and Idiognathoides postsulcatus. The GSSP candidate sections are the Ural mountains or in Nashui, Luodian County, Guizhou, China.

The Moscovian is in the ICS geologic timescale a stage or age in the Pennsylvanian, the youngest subsystem of the Carboniferous. The Moscovian age lasted from 315.2 to 307 Ma, is preceded by the Bashkirian and is followed by the Kasimovian. The Moscovian overlaps with the European regional Westphalian stage and the North American Atokan and Desmoinesian stages.

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References

  1. ↑ New Pennsylvanian conodonts from Oklahoma. RW Harris and RV Hollingsworth, American Journal of Science, March 1933, series 5, volume 25, no. 147, pages 193-204, doi:10.2475/ajs.s5-25.147.193
  2. ↑ Polygnathodella Harlton, 1933, or Idiognathoides Harris and Hollingsworth, 1933? Glen K. Merrill, Journal of Paleontology, March 1963, volume 37, issue 2 (abstract)
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