Arcturus Mine: Turonian, Minnesota
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Gastropoda
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Gastropoda indet.
Cuvier 1795
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| "gastropod sp." | ||||||||||
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Gastropoda
- Eucyclidae
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? Calliomphalus colerainensis
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| n. sp. - originally entered as "? Calliomphalus colerainensis" | ||||||||||
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Gastropoda
- Aporrhaidae
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? Aporrhais sp.
da Costa 1778
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| originally entered as "? Aporrhais sp." | ||||||||||
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Anchura grouti
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| n. sp. | ||||||||||
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Gastropoda
- Naticidae
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Gyrodes conradi
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Gastropoda
- Neritidae
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? Nerita minnesotensis
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| n. sp. - originally entered as "? Nerita minnesotensis" | ||||||||||
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Bivalvia
- Pandorida
- Laternulidae
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Anatimya plicata
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| n. sp. | ||||||||||
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Bivalvia
- Solenida
- Pharidae
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Siliqua huerfanensis
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Bivalvia
- Cardiida
- Arcticidae
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? Etea sp.
Conrad 1873
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| originally entered as "? Etea sp." | ||||||||||
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Bivalvia
- Cardiida
- Veneridae
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Tapes cyprimeriformis
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Legumen cf. planulatum
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| originally entered as "Legumen cf. planulatum" | ||||||||||
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Bivalvia
- Cardiida
- Anatinellidae
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Anatina marblensis
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| n. sp. | ||||||||||
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Bivalvia
- Cardiida
- Mactridae
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Cymbophora ? utahensis
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| originally entered as "Cymbophora ? utahensis" | ||||||||||
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Bivalvia
- Cardiida
- Cardiidae
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Cardium enstromi
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| n. sp. | ||||||||||
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Bivalvia
- Mytilida
- Mytilidae
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Brachidontes arcturusensis
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| n. sp. | ||||||||||
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Bivalvia
- Arcida
- Arcidae
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Barbatia micronema
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Bivalvia
- Myalinida
- Inoceramidae
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Inoceramus fragilis
Hall and Meek 1856
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Bivalvia
- Ostreida
- Pteriidae
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Pteria gastrodes
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Bivalvia
- Ostreida
- Malleidae
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Vulsella sp.
Ršding 1798
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| originally entered as "Volsella sp." | ||||||||||
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Bivalvia
- Ostreida
- Gryphaeidae
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Exogyra lamellosa
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| n. sp. | ||||||||||
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Exogyra suborbiculata
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Exogyra sp.
Say 1820
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Bivalvia
- Ostreida
- Ostreidae
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Ostrea congesta
Conrad 1843
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Ostrea gilei
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| n. sp. | ||||||||||
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Ostrea prudentia
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Ostrea staufferi
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| (Alectryonia) n. sp. | ||||||||||
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Ostrea soleniscus
Meek 1893
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| "var." | ||||||||||
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Bivalvia
- Pectinida
- Pectinidae
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Pecten platessus
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| (Camptonectes); possibly more than one var. | ||||||||||
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Cephalopoda
- Ammonitida
- Acanthoceratidae
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Metoicoceras aff. swallovi
(Shumard 1859)
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| originally entered as "Metoicoceras aff. swallovi" | ||||||||||
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= Metoicoceras bergquisti
Cobban 1983
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Cobban 1983 | |||||||||
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unclassified
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Bryozoa indet.
Ehrenberg 1831
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| encrusting form | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Minnesota | County: | Itasca |
| Coordinates: | 47.0° North, 93.0° West (view map) | ||||
| Paleocoordinates: | 45.6° North, 54.7° West | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Turonian | 10 m.y. bin: | Cretaceous 6 | *Epoch: | Gallic |
| Key time interval: | Turonian | ||
| Age range of interval: | 93.90000 - 89.80000 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Coleraine | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: "On the basis of the fauna [the fm.] is considered the age equivalent of the lower Benton in the Colorado series." TURONIAN info from R.E. Sloan (1964) The Cret. Syst. in MN; Minn. Geol. Surv. Rept. Invest. 5 | |||||
Lithology and environment
| Primary lithology: | poorly lithified ironstone | ||
| Secondary lithology: | conglomerate | ||
| Environment: | marine indet. | Tectonic setting: | cratonic basin |
| Geology comments: "...the maximum thickness of the Cret encountered during the height of operations was 12 ft. The coarse basal congl. was about a foot thick was overlain by a fossiliferous grit lean ore. Most of the Cret is now covered by surface slump." | |||
Taphonomy
| Modes of preservation: | body |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | surface (in situ),mechanical,field collection,survey of museum collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: "During a 12 month period in 1937 and 1938 the writer studied in detail the Mesabi invertebrate fossil collection at the University of Minnesota...Good fossil specimens were difficult to find during the field season of 1937 when the writer visited the region." | |
| Taxonomic list comments:No attempt was made to identify any vertebrate material such as shark and reptile teeth and vertebrae, which are rather plentiful. The plant life has likewise been neglected..." | |
Metadata
| Database number: | 1989 | ||
| Authorizer: | J. Alroy, P. Wagner | Enterer: | M. Sommers, P. Wagner | Research group: | marine invertebrate |
| Collections that are a subset of this one: | |||
| Created: | 1999-06-15 14:58:29 | Last modified: | 2001-08-30 17:52:51 |
| Access level: | the public | Released: | 2000-11-20 13:53:20 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 53. | H. R. Bergquist. 1944. Cretaceous of the Mesabi Iron Range, Minnesota. Journal of Paleontology 18(1):1-30 [J. Alroy/M. Sommers/J. Alroy] |
Secondary references:
| 29572 | W. A. Cobban. 1983. Molluscan fossil record from the northeastern part of the Upper Cretaceous seaway, Western Interior. United States Geological Survey Professional Paper 1253:1-25 [A. Hendy/A. Hendy/A. Hendy] |