GC Sample 4: Llandovery, Iowa
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Psuedolonchodina sp.
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1 element | |||||||||
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Conodonta
- Prioniodontida
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Oulodus sp.
Branson and Mehl 1933
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1 element | |||||||||
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Conodonta
- Prioniodontida
- Balognathidae
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Pterospathodus amorphognathoides
Walliser 1964
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2 elements | |||||||||
| Subspecies"Pterospathodus amorphognathoides angulatus" | ||||||||||
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Conodonta
- Panderodontida
- Panderodontidae
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Panderodus equicostatus
(Rhodes 1953)
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3 elements | |||||||||
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Panderodus greenlandensis
Armstrong 1990
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1 element | |||||||||
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Panderodus unicostatus
(Branson and Mehl 1933)
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3 elements | |||||||||
| original and current combination Paltodus unicostatus | ||||||||||
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Conodonta
- Ozarkodinida
- Spathognathodontodae
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Wurmiella ? polinclinata
(Nicoll and Rexroad 1968)
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1 element | |||||||||
| Subspecies"Wurmiella ? polinclinata polinclinata" | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Iowa |
| Coordinates: | 42.0° North, 92.0° West (view map) | ||
| Paleocoordinates: | 19.7° South, 57.3° West | ||
| Basis of coordinate: | estimated from map |
Time
| Period: | Silurian | Epoch: | Llandovery |
| 10 m.y. bin: | Silurian 1 | ||
| Key time interval: | Llandovery | Conodont zone: | Pterospathodus celloni |
| Age range of interval: | 443.80000 - 433.40000 m.y. ago |
Stratigraphy
| Formation: | LaPorte City | ||||
| Stratigraphy comments: Sample (m) 118,20-118,41 |
Lithology and environment
| Primary lithology: | lithified cherty/siliceous "limestone" |
| Lithology description: The base of the LPC is equivalent to the uppermost part of the lower Hopkinton member, and is composed mainly of breccia beds with chert and large limestone interclasts in a slightly sandy mud matrix. The portion of the LPC equivalent to the Farmers Creek Quarry Member contains brecciated chert beds, a bio-dolo-mud- to wackestone with crinoid debris, and bio-mud- to packstones. Chert nodules are scattered throughout. The portion of the LPC equivalent to the Picture Rock Member of the Hopkinton Formation is a green, calcareous shale to mudstone, and the remainder are bio-wacke- to packstones. The portion of the LPC equivalent to the BCQ Member of the Scotch Grove Formation is composed of predominantly mudstones with scattered crinoid debris punctuated by occasional bio-wacke- to packstones with crinoid debris and brachiopod fossils. There are some intervals of argillaceous mudstones and calcareous green shales that are more predominant in the middle of the BCQ equivalent in the GC. | |
| Environment: | carbonate indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | microfossils |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 191067 | ||
| Authorizer: | E. Jarochowska | Enterer: | S. Haegele |
| Modifier: | S. Haegele | Research group: | micropaleontology,vertebrate |
| Created: | 2018-01-08 13:14:59 | Last modified: | 2018-01-08 13:18:01 |
| Access level: | authorizer only | Released: | 2020-01-08 13:14:59 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 63246. | C. B. T. Waid and B. D. Cramer. 2017. Telychian (Llandovery, Silurian) conodonts from the LaPorte City Formation of eastern Iowa, USA (East-Central Iowa Basin) and their implications for global Telychian conodont biostratigraphic correlation. Palaeontologia Electronica 20(2):1-37 [P. Wagner/P. Wagner] |