Zones B & C, Tanyard Formation: Gasconadian, Texas
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Anthozoa
- Lichenariida
- Lichenariidae
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Lichenaria sp.
Winchell and Schuchert 1895
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Rhynchonellata
- Pentamerida
- Clarkellidae
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Syntrophina sp.
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Rhynchonellata
- Pentamerida
- Tetralobulidae
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Tetralobula sp.
Ulrich and Cooper 1936
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Rhynchonellata
- Orthida
- Finkelnburgiidae
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Finkelnburgia sp.
(Walcott 1905)
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unclassified
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Dateroceras sp.
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Gastropoda
- Euomphalina
- Ophiletidae
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Ozarkina sp.
Ulrich et al. 1931
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Ophileta sp.
Vanuxem 1842
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Gastropoda
- Euomphalina
- Macluritidae
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Macluritella sp.
Kirk 1927
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| originally Lytospira; PJW3 | ||||||||||
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Prohelicotoma sp.
Flower 1968
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| originally Helicotoma; PJW3 | ||||||||||
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Gastropoda
- Sinuopeidae
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Gasconadia sp.
Weller and St. Clair 1928
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Sinuopea sp.
Ulrich 1911
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Chepultapecia sp.
Weller and St. Clair 1928
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Schizopea sp.
Butts 1926
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Rostroconchia
- Ribeirioida
- Technophoridae
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Ribeiria sp.
Sharpe 1853
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Cephalopoda
- Ellesmerocerida
- Ellesmeroceratidae
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Clarkoceras sp.
Ruedemann 1905
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Conocerina sp.
Ulrich and Foerste 1936
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Ectenoceras sp.
Ulrich and Foerste 1936
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Burenoceras sp.
Ulrich and Foerste 1931
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Oneotoceras sp.
Ulrich 1926
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Levisoceras sp.
Foerste 1925
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Trilobita
- Proetida
- Hystricuridae
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Paraplethopeltis sp.
Bridge and Cloud 1947
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Trilobita
- Corynexochida
- Leiostegiidae
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Leiostegium sp.
Raymond 1913
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Texas |
| Coordinates: | 30.3° North, 97.7° West (view map) | ||
| Paleocoordinates: | 21.1° South, 90.8° West | ||
| Basis of coordinate: | based on political unit | ||
| Geographic resolution: | basin |
Time
| Period: | Ordovician | Epoch: | Early Ordovician |
| Stage: | Tremadocian | 10 m.y. bin: | Ordovician 1 |
| *Period: | Early/Lower Ordovician | ||
| Key time interval: | Gasconadian | Conodont zone: | Rossodus manitouensis |
| Age range of interval: | 485.4 - 477.7 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Tanyard | ||||
| Stratigraphy comments: "L. Ord. zones B & C". (Those are trilobite zones; zone C for condonts; Skullrockian of modern usage. However, that includes the latest Cambrian.) |
Lithology and environment
| Primary lithology: | desiccation cracks,current ripples,flat-pebble "limestone" |
| Environment: | peritidal |
| Geology comments: "ls., locally dessicated, rippled; f-p congl. peritidal (BA1)" | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | paleoecologic analysis |
| Taxonomic list comments:"P.E. Cloud Jr. and V.E.Barnes, 1957. Early Ord. sea in central Texas. pp163-214 in H.S.Ladd (ed) Treatise on marine ecology and paleoecology, v2[?illeg.] Paleoecolgy. GSA Mem.67" | |
Metadata
| Database number: | 271 | ||
| Authorizer: | J. Sepkoski | Enterer: | M. Sommers |
| Modifier: | J. Ju | Research group: | marine invertebrate |
| Created: | 1998-11-20 10:07:18 | Last modified: | 2017-01-06 18:00:52 |
| Access level: | the public | Released: | 1998-11-20 10:07:18 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 49669. | P. E. Cloud and V. E. Barnes. 1957. Early Ordovician Sea in Central Texas. Geological Society of America Memoirs 67(2):163-214 [P. Wagner/P. Wagner/M. Uhen] |