Williamson Shale, Second Creek: Llandovery, New York
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Pterobranchia
- Dendroidea
- Acanthograptidae
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Dictyonema sp.
Hall 1851
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| "Present, abundance unspecified" | ||||||||||
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Pterobranchia
- Graptoloidea
- Monograptidae
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Monograptus clintonensis
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| "Very abundant, dominant" | ||||||||||
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Pterobranchia
- Graptoloidea
- Retiolitidae
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Retiolites geinitzianus
Barrande 1850
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| "venosus", "Present, abundance unspecified" | ||||||||||
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Ostracoda
- Palaeocopida
- Beyrichiidae
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Dibolbina informal new sp. 1
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| "new" | ||||||||||
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Dibolbina informal new sp. 2
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| "Present, abundance unspecified" | ||||||||||
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Beyrichia aff. lakemontensis
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| "Common" | ||||||||||
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Ostracoda
- Palaeocopida
- Zygobolbidae
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Mastigobolbina punctata
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| "Present, abundance unspecified" | ||||||||||
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Mastigobolbina trilobata
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| "Present, abundance unspecified" | ||||||||||
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Mastigobolbina typus
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| "Present, abundance unspecified" | ||||||||||
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Gastropoda
- Murchisoniina
- Murchisoniidae
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Hormotoma subulata
(Conrad 1842)
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| original and current combination Murchisonia subulata | ||||||||||
| "Present, abundance unspecified" | ||||||||||
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Tentaculitida
- Tentaculitidae
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Tentaculites sp.
von Schlotheim 1820
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| "Present, abundance unspecified" | ||||||||||
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Craniata
- Craniopsida
- Craniopsidae
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Craniops linguiformis
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| "Present, abundance unspecified" | ||||||||||
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Rhynchonellata
- Orthida
- Dicoelosiidae
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Dicoelosia biloba
(Linnaeus 1758)
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| "In some cases very abundant" | ||||||||||
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Rhynchonellata
- Athyridida
- Meristellidae
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Whitfieldella cf. oblata
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| "Present, abundance unspecified" | ||||||||||
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Rhynchonellata
- Protorthida
- Skenidiidae
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Skenidioides pyramidalis
(Twenhofel 1928)
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| "Present, abundance unspecified" | ||||||||||
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Rhynchonellata
- Spiriferida
- Cyrtiidae
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Eospirifer radiatus
(Sowerby 1834)
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| "Present, abundance unspecified" | ||||||||||
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Rhynchonellata
- Atrypida
- Atrypidae
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Atrypa reticularis
(Linnaeus 1758)
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| original and current combination Anomia reticularis | ||||||||||
| "In some cases very abundant" | ||||||||||
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Rhynchonellata
- Atrypida
- Atrypinidae
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Atrypina disparilis
(Hall 1852)
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| "Present, abundance unspecified" | ||||||||||
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Leptaena rhomboidalis
(Wahlenberg 1818)
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| recombined as Leptaena (Leptaena) rhomboidalis | ||||||||||
| "Common" | ||||||||||
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Strophomenata
- Strophomenida
- Chonetidae
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"Chonetes" cornutus
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| "Common" | ||||||||||
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Strophomenata
- Strophomenida
- Sowerbyellidae
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Eoplectodonta transversalis
(Wahlenberg 1818)
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| recombined as Eoplectodonta (Eoplectodonta) transversalis | ||||||||||
| "Common" | ||||||||||
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Strophomenata
- Orthotetida
- Chilidiopsidae
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Coolinia subplana
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| spelled with current rank as Fardenia (Coolinia) | ||||||||||
| "Present, abundance unspecified" | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | New York |
| Coordinates: | 43.0° North, 77.0° West (view map) | ||
| Paleocoordinates: | 24.9° South, 46.6° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | outcrop |
Time
| Period: | Silurian | Epoch: | Llandovery |
| 10 m.y. bin: | Silurian 1 | ||
| Key time interval: | Llandovery | ||
| Age range of interval: | 443.80000 - 433.40000 m.y. ago |
Stratigraphy
| Geological group: | Clinton | Formation: | Williamson Shale | ||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Listed as Upper Llandovery, C6. Type locality; BA4/5 BA5 Monograptid-Strophochonetes community; in Eckert and Brett, 1989: BA5 Monograptid-"Chonetes" cornutus association. Sampled bed: Lower meter | |||||
Lithology and environment
| Primary lithology: | poorly lithified "shale" |
| Lithology description: Dark gray to black (and rarely dark greenish gray), fissile to platy, laminated clay to slightly silty shales, with rare pyrite and sparse bioturbation, commonly interbedded with thin-bedded quartz arenites (siltstones and sandstones) and occasional carbonate concretions | |
| Environment: | deep subtidal shelf |
| Geology comments: Fossil layers generally associated with thin, sandy tempestites (thus, not life assemblages and with some winnowing). Generally reduced oxygen with occasional intervals of anoxia and normal oxygen levels | |
Taphonomy
| Modes of preservation: | body,trace,replaced with pyrite |
| Degree of concentration: | -single event |
| Size of fossils: | macrofossils,mesofossils |
| Spatial orientation: | life position |
| Articulated whole bodies: | many |
| Size sorting: | poor |
| Temporal resolution: | snapshot |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 77081 | ||
| Authorizer: | P. Novack-Gottshall | Enterer: | P. Hearn |
| Modifier: | P. Novack-Gottshall | Research group: | marine invertebrate |
| Created: | 2007-12-19 12:09:30 | Last modified: | 2008-06-23 12:50:01 |
| Access level: | the public | Released: | 2007-12-19 12:09:30 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 26081. | B.Y. Eckert and C. E. Brett. 1989. Bathymetry and paleoecology of Silurian benthic assemblages, late Llandoverian, New York State. Palaeogeography, Palaeoclimatology, Palaeoecology 74:297-326 [P. Novack-Gottshall/P. Hearn] |