Waukesha [Brandon Bridge Fm] (Silurian of the United States)

Where: Wisconsin (43.0° N, 88.2° W: paleocoordinates 21.4° S, 53.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Brandon Bridge Formation, Telychian (438.5 - 433.4 Ma)

• STRATIGRAPHIC RELATIONS: From the Brandon Bridge Fm, which unconformably overlies the Kankakee Dolomite, and conformably grades up into the Waukesha Dolomite. AGE: Latest Llandovery; based on graptolite biostratigraphy; Monograptus spiralis. Conodonts from the top of the Brandon Bridge Fm also support a late Llandovery-early Wenlockian age. Early Telychian according to Haug et al., 2014. STRATIGRAPHIC POSITION: From a 12 cm thick layer overlying the lowest 2 m of strata.

• bed-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; lithified mudstone and lithified dolomite

• Fine scale lamination with limited bioturbation suggests deposition in an anoxic, possibly brackish, environment.
• SPECIFIC LITHOLOGY: Finely laminated mudstone and dolomite. LITHIFICATION: Lithified, on the basis of figured specimens and facies description.

Size class: macrofossils

Preservation: soft parts

Collection methods: COLLECTOR: Not stated in text. REPOSITORY: University of Wisconsin.

Primary reference: D. G. Mikulic, D. E. G. Briggs, and J. Kluessendorf. 1985. A New Exceptionally Preserved Biota from the Lower Silurian of Wisconsin, USA. Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences 311(1148):75-85 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 91415: authorized by Austin Hendy, entered by Austin Hendy on 21.09.2009, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Not exhaustive for marine invertebrate taxa, but representative. NOMENCLATURE: Not and authoritative publication, but with modern nomenclature. Many taxa identified to family or phylum level because of poor preservation and unknown taxonomic relationships.
unclassified
  -
Trilobita
 Corynexochida - Illaenidae
Stenopareia sp. Holm 1886 trilobite
 Phacopida - Encrinuridae
Encrinurinae indet. Angelin 1854 trilobite
 Phacopida - Dalmanitidae
Dalmanitidae indet. Vogdes 1890 trilobite
 Phacopida - Calymenidae
Calymenidae indet. Milne-Edwards 1840 trilobite
 Phacopida - Cheiruridae
Cheiruridae indet. Hawle and Corda 1847 trilobite
 Phacopida - Phacopidae
Phacopidae indet. Hawle and Corda 1847 trilobite
  - Scutelluidae
Meroperix sp. Lane 1972 trilobite
 Proetida - Aulacopleuridae
"Otarionidae indet." = Otarioninae
"Otarionidae indet." = Otarioninae Richter and Richter 1926 trilobite
 Proetida - Proetidae
Proetidae indet. Salter 1864 trilobite
 Lichida - Odontopleuridae
Leonaspis sp. Richter and Richter 1917 trilobite
 Harpetida - Harpetidae
Scotoharpes sp. Lamont 1948 trilobite
Malacostraca
 Phyllocarida -
Archaeostraca indet. Claus 1888
Ceratiocarid
Thylacocephala
 Concavicarida -
Concavicarida indet. Briggs and Rolfe 1983
  -
Thylacares brandonensis n. gen. n. sp.
Thylacares brandonensis n. gen. n. sp. Haug et al. 2014
Ostracoda
  -
Ostracoda indet. Latreille 1802 ostracod
 Leperditicopida -
Leperditicopida indet. Scott 1961 ostracod
Xiphosura
 Xiphosurida -
Xiphosurida indet. Latreille 1802
Bilateria
  -
Palaeoscolecida indet. Conway-Morris and Robison 1986
unclassified
  -
Annelida indet. Lamarck 1809
Conodonta
 Panderodontida - Panderodontidae
Panderodus sp. Ethington 1959 conodont
Graptolithina
 Bireclinata - Monograptidae
"Monograptus spiralis" = Oktavites spiralis
"Monograptus spiralis" = Oktavites spiralis Geinitz 1842 graptoloid
 Dendroidea -
Dendroidea indet. Nicholson 1872 graptolite
Scyphozoa
 Conulariida -
Conulariida indet. Miller and Gurley 1896 jellyfish