Dlouha hora near Beroun: Ludfordian, Czech Republic
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Trilobita
- Proetida
- Proetidae
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Proetus ryckholtii n. sp.
(Barrande 1846)
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| recombined as Rijckholtia ryckholti | |||||||
| see common names | |||||||
Geography
| Country: | Czech Republic |
| Coordinates: | 50.0° North, 12.9° East (view map) |
| Paleocoordinates: | 51.6° South, 55.8° East |
| Basis of coordinate: | based on nearby landmark |
| Geographic resolution: | local area |
Time
| Period: | Silurian | Epoch: | Ludlow |
| Stage: | Ludfordian | 10 m.y. bin: | Silurian 2 |
| Key time interval: | Ludfordian | ||
| Age range of interval: | 425.60000 - 423.00000 m.y. ago |
Stratigraphy
| Formation: | Kopanina | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Ananaspis fecunda horizon. Correlation of fecundus level with upper Ludfordian based on Havlicek and Storch (1999 in Boucot and Lawson). | |||||
Lithology and environment
| Primary lithology: | shelly/skeletal grainstone |
| Secondary lithology: | argillaceous "limestone" |
| Includes fossils? | Y |
| Includes fossils? | Y |
| Lithology description: "The sequence of calcareous shales, commonly with tuffaceous intercalations, occupying the lowermost part of the Kopanina Formation, is overlain by bioclastic limestones of the E. beaumonti Horizon of the lower Kopanina Formation..." "...biosparitic limestone and laminated, argillaceous limestones..." | |
| Environment: | marine indet. |
| Geology comments: "Decrease in volcanic activity...provided favorable conditions for carbonate sedimentation and the development of fauna on the NW flank of the 'syncline' whereas calc. shale sed. dominated by graptolites continued along the SE limb...The high dominance, low diversity atrypid and athyrid lenses may represent BA 2, quiet water, restrictive conditions...[various aspects of shell preservation discussed, as well as shell accumulation indicating rough water in places...] Prevalence of small, smooth brachiopods and numerous trilobites is consistent with BA 3-4 position that graded laterally in calc. shales dom. by graptolites..." | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | paleoecologic analysis |
| Collection method comments: Trilobites based in part on Chlupac (1987) (ref. 6191) (his Encrinuraspis-Eophacops and Encrinuraspis-Metacalymene-Prantlia assemblages). Relative abundances of brachiopods given by the authors. | |
Metadata
| Database number: | 230813 | ||
| Authorizer: | P. Wagner | Enterer: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2023-07-21 14:53:19 | Last modified: | 2023-07-21 14:53:19 |
| Access level: | the public | Released: | 2023-07-21 14:53:19 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 75054. | M. Šnajdr. 1980. Bohemian Silurian and Devonian Proetidae (Trilobita). Rozpravy Ústøedního Ústavu Geologického 45:1-324 [P. Wagner/P. Wagner] |