1 kilometer south of Taylors Falls, half kilometer north of Folsom Island: Steptoean, Minnesota
collected by C. P. Berkey 1890-1898

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Lingulata - Lingulida - Obolidae
Lingula ampla Owen 1852
Walcott 1912
Lingula antiqua Emmons 1842
Walcott 1912
Walcott 1912
Obolella polita (Hall 1861)
Walcott 1912
Tergomya - Tryblidiida - Tryblidiidae
Tergomya - Kiringellida
Hypseloconus recurvus elongatus
Tergomya - Kiringellida - Hypseloconidae
Gastropoda - Bellerophontida - Tropidodiscidae
Euomphalus n. ssp. strongi sinistrorsus
Paragastropoda - Mimospirida - Onychochilidae
Trilobita - Corynexochida - Cheilocephalidae
Trilobita - Olenida - Pterocephaliidae
    = Camaraspis convexus Whitfield 1878
Yochelson and Webers 2006
Agraulus convexus var. A
Yochelson and Webers 2006
Trilobita - Asaphida - Dikelocephalidae
Berkeia typica n. gen., n. sp. Resser 1937
Resser 1937
Agraulus convexus var. B
see common names

Geography
Country:United States State/province:Minnesota County:Chisago
Coordinates: 45.4° North, 92.7° West (view map)
Paleocoordinates:20.8° North, 106.2° West (Wright 2013)
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period: Cambrian Epoch: Furongian
10 m.y. bin: Cambrian 5
Key time interval: Steptoean Trilobite zone:  Elvinia
Age range of interval: 497 - 493.5 m.y. ago
Stratigraphy
Formation:Franconia Member:Mill Street Conglomerate
Stratigraphic resolution:member
Lithology and environment
Primary lithology: lithified sandstone
Lithology description: very coarse-grained, consisting of angular to well rounded basalt blocks as much as 2 feet in diameter surrounded by fine- to medium-grained, buff quartzose sandstone. (Yochelson & Webers 2006)
Environment:coastal indet.
Geology comments: We suggest that the boulders of the conglomerate provided such a protected habitat, at least locally, in a quartz-sand beach habitat. The conical and limpetlike forms could safely move among the boulders, sheltered from any heavy wave action, if such were present. By comparison to present-day rocky marine shores, one may argue that although stromatolites did not develop in this environment, algal films could flourish on the boulders to provide a food supply for the mollusks.
Taphonomy
Modes of preservation:body,cast
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:some macrofossils
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH,USNM
Collectors:C. P. Berkey Collection dates:1890-1898
Taxonomic list comments:Non-molluscs include:
Lingula ampla Owen
Lingula antiqua Hall
Lingulepis pinniforms Owen (= Lingulepis acuminata Conrad)
Obolella polita
Oboldla polit,l Hall.
Metadata
Also known as:82b of Resser 1937
Database number:156300
Authorizer:P. Wagner Enterer:P. Wagner
Modifier:P. Wagner Research group:marine invertebrate
Created:2014-05-16 15:08:22 Last modified:2025-02-22 15:12:02
Access level:the public Released:2014-05-16 15:08:22
Creative Commons license:CC0
Reference information

Primary reference:
15750. C.P. Berkey. 1898. Geology of the St. Croix Dalles, part 3. Paleontology. American Geologist 21:270-294 [P. Wagner/P. Wagner]

Secondary references:

10294 P. A. Jell and J. M. Adrain. 2002. Available generic names for trilobites. Memoirs of the Queensland Museum 48(2):331-553 [N. Hughes/L. English/M. Hopkins]
51193 C. E. Resser. 1937. Third contribution to nomenclature of Cambrian trilobites. Smithsonian Miscellaneous Collections 95(22):1-29 [P. Wagner/P. Wagner]
13472 C. D. Walcott. 1912. Cambrian Brachiopoda. United States Geological Survey Monograph 51(1-2) [A. Miller/A. Hendy/A. Hendy]
51189 E. L. Yochelson and G. F. Webers. 2006. A restudy of the Late Cambrian molluscan fauna of Berkey (1898) from Taylors Falls, Minnesota. Minnesota Geological Survey Report of Investigations 64:1-60 [P. Wagner/P. Wagner]