A20. South end of Valcour Island, Crown Point Fm.: Chazyan, New York
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Demospongiae
- Streptosolenidae
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Eospongia varians
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Paracrinoidea
- Platycystitida
- Malocystitidae
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Malocystites murchisoni
Billings 1858
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Trilobita
- Phacopida
- Pliomeridae
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Pliomerops canadensis
(Billings 1859)
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Trilobita
- Phacopida
- Encrinuridae
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Cybele primus
(Narraway and Raymond 1906)
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Trilobita
- Phacopida
- Cheiruridae
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Sphaerexochus parvus
Billings 1865
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Trilobita
- Phacopida
- Pterygometopidae
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Pterygometopus annulatus
Raymond 1905
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Trilobita
- Trinucleida
- Raphiophoridae
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Lonchodomas chaziensis
Shaw 1968
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Shaw 1968 | |||||||||
| see Shaw (1968, p. 34) | ||||||||||
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Trilobita
- Asaphida
- Asaphidae
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Isotelus harrisi
Raymond 1905
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Isotelus obtusum
(Raymond 1905)
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Trilobita
- Corynexochida
- Illaenidae
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Thaleops ovata
Conrad 1843
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Trilobita
- Harpetida
- Harpetidae
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Eoharpes ottawaensis
Raymond 1910
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Trilobita
- Lichida
- Lichidae
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Amphilichas minganensis
(Billings 1865)
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Rhynchonellata
- Pentamerida
- Camerellidae
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Camerella varians
Billings 1859
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= Camerella ventricosa
Cooper 1956
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Cooper 1956 | |||||||||
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Rhynchonellata
- Orthida
- Plectorthidae
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Hebertella vulgaris
Raymond 1911
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Rhynchonellata
- Orthida
- Plaesiomyidae
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Plaesiomys platys
(Billings 1859)
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Plaesiomys strophomenoides
Raymond 1905
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Strophomenata
- Strophomenida
- Rafinesquinidae
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Rafinesquina alternata
(Conrad 1838)
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Rafinesquina champlainensis
Raymond 1902
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Strophomenata
- Orthotetida
- Triplesiidae
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Camerella longirostris
(Billings 1859)
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Bivalvia
- Myalinida
- Ambonychiidae
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Clionychia montrealensis
(Billings 1859)
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Bivalvia
- Solemyida
- Ctenodontidae
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Ctenodonta peracuta
Raymond 1905
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Gastropoda
- Murchisoniina
- Eotomariidae
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Eotomaria obsoletum
(Raymond 1905)
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Clathrospira obsoletum
(Raymond 1905)
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Gastropoda
- Murchisoniina
- Trochonematidae
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Lophospira rectangularis
Raymond 1905
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Trochonema rectangularis
(Raymond 1905)
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Trochonema dispar
Raymond 1905
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Gastropoda
- Murchisoniina
- Lophospiridae
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Lophospira subabbreviata
Raymond 1908
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Gastropoda
- Bellerophontida
- Plectonotidae
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Bucania bidorsata
Hall 1847
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Gastropoda
- Bellerophontida
- Bucaniidae
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Bucania sulcatina
(Emmons 1842)
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Gastropoda
- Euomphalina
- Holopeidae
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Holopea scrutator
Raymond 1905
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Gastropoda
- Euomphalina
- Ophiletidae
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Eccyliopterus fredericus
(Raymond 1902)
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Gastropoda
- Euomphalina
- Macluritidae
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Maclurites magnus
(Le Sueur 1818)
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Gastropoda
- Euomphalina
- Raphistomatidae
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Raphistoma striatum
(Emmons 1842)
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Raphistoma stamineum
Hall 1847
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | New York | County: | Clinton |
| Coordinates: | 44.6° North, 73.5° West (view map) | ||||
| Paleocoordinates: | 9.9° South, 100.8° West (Wright 2013) | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Ordovician |
| 10 m.y. bin: | Ordovician 2-4 |
| Key time interval: | Chazyan |
| Age range of interval: | 470 - 457 m.y. ago |
Stratigraphy
| Geological group: | Chazy | Formation: | Crown Point | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: E. Chazyan; section A
Raymond's A20 is equivalent to lowermost Crown Point Fm according to Shaw (1968, p. 3) | |||||
Lithology and environment
| Primary lithology: | black,blue lithified "limestone" |
| Secondary lithology: | "shale" |
| Includes fossils? | Y |
| Lithology description: Heavy-bedded, fairly pure blue-black limestone, with much shaly matter betewen layers. Fossil are semi-silicified and weather out easily. | |
| Environment: | carbonate indet. |
Taphonomy
| Modes of preservation: | body,replaced with silica |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection excludes: | some genera |
| Reason for describing collection: | general faunal/floral analysis |
Metadata
| Database number: | 56184 | ||
| Authorizer: | P. Wagner, B. Kröger | Enterer: | P. Wagner, B. Kröger |
| Modifier: | B. Kröger | Research group: | marine invertebrate |
| Created: | 2005-11-14 22:47:20 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2005-11-14 22:47:20 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 15149. | P. E. Raymond. 1906. The Chazy Formation and its fauna. Annals of the Carnegie Museum 3(4):498-596 [P. Wagner/P. Wagner] |
Secondary references:
| 44678 | G. A. Cooper. 1956. Chazyan and related brachiopods. Smithsonian Miscellaneous Collections 127:1-1245 [P. Wagner/P. Wagner] | |
| 23704 | F.C. Shaw. 1968. Early Middle Ordovician (Chazy) trilobites of New York. New York State Museum and Science Service Memoir 17:1-163 [P. Wagner/P. Wagner] |