Marshalltown Formation (Delaware) fauna: Middle Campanian - Late/Upper Campanian, Delaware
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Cephalopoda
- Ammonitida
- Pachydiscidae
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Pachydiscus (Pachydiscus) sp.
Zittel 1884
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Menuites portlocki
(Sharp 1855)
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| Listed as "Menuites portlocki complexus" | ||||||||||
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Cephalopoda
- Ammonitida
- Nostoceratidae
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Didymoceras binodosum
(Kennedy and Cobban 1993)
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Cephalopoda
- Ammonitida
- Baculitidae
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Baculites ovatus
(Say 1820)
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Bivalvia
- Cardiida
- Veneridae
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Cyprimeria sp.
Conrad 1864
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Bivalvia
- Cardiida
- Cardiidae
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Cardium sp.
Linnaeus 1758
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Bivalvia
- Trigoniida
- Trigoniidae
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Trigonia sp.
Bruguière 1789
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Bivalvia
- Ostreida
- Flemingostreidae
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Ostrea (Agerostrea) falcata
Morton 1827
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| recombined as Agerostrea falcata | ||||||||||
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Bivalvia
- Ostreida
- Gryphaeidae
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Exogyra ponderosa
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Bivalvia
- Arcida
- Cucullaeidae
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Cucullaea sp.
Lamarck 1801
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| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Delaware | County: | New Castle |
| Coordinates: | 39.6° North, 75.7° West (view map) | ||||
| Paleocoordinates: | 39.0° North, 45.6° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | local area |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 |
| Key time interval: | Middle Campanian - Late/Upper Campanian | ||
| Age range of interval: | 83.60000 - 72.10000 m.y. ago |
Stratigraphy
| Formation: | Marshalltown | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: Underlain by Englishtown Formation (burrowed quartz sand), and overlain by Mount Laurel Sand (burrowed quartz sand) - collection 35049. | |||||
Lithology and environment
| Primary lithology: | burrows,glauconitic,shelly/skeletal,brown lithified silty,carbonaceous sandstone |
| Includes fossils? | Y |
| Lithology description: "Marshalltown Formation is a dark greenish-gray, very fine to fine, clayey, glauconitic sand"; 3-4 m thick. | |
| Environment: | transition zone/lower shoreface |
| Geology comments: See Owens and Minard (1970) for detailed geologic data on geology of Chesapeake and Delaware Canal area. "Marshalltown was deposited in a shelf to lower shoreface environment" | |
Taphonomy
| Modes of preservation: | body,mold/impression,replaced with calcite,replaced with phosphate |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | salvage,selective quarrying,field collection,observed (not collected) |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | AMNH,UNSM |
| Collection method comments: Collections by local amateur paleontology organisationsl collections from spoil heaps along canal west of Saint Georges, DE | |
| Taxonomic list comments:Compilation of taxonomic descriptions of ammonoids, and other taxa mentioned in text | |
Metadata
| Also known as: | Marshalltown Formation (St Georges) fauna | ||
| Database number: | 35048 | ||
| Authorizer: | A. Hendy | Enterer: | A. Hendy |
| Modifier: | G. Varnham | Research group: | marine invertebrate |
| Created: | 2003-10-28 00:44:47 | Last modified: | 2022-04-21 07:50:39 |
| Access level: | the public | Released: | 2003-10-28 00:44:47 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 9423. | 1% 2220 | W. J. Kennedy and W.A. Cobban. 1997. Upper Campanian (Upper Cretaceous) ammonites from the Marshalltown Formation-Mount Laurel boundary beds in Delaware. Journal of Paleontology 71(1):62-73 [A. Miller/A. Hendy/A. Hendy] |