Halquist Quarry #2 (Silurian to of the United States)

Where: Waukesha County, Wisconsin (43.0° N, 88.2° W: paleocoordinates 21.0° S, 53.9° W)

• coordinate based on political unit

• outcrop-level geographic resolution

When: Aeronian to Aeronian (440.8 - 433.4 Ma)

• "Aeronian to early Telychian." This collection lumps a member of overlying formation (Franklin member of Waukesha Fm.) with the Byron Fm. Both share the same lithology, according to author.

• group-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; lithified, burrowed, cherty/siliceous dolomite

• "bioturbated dolomite mudstone, contains a diverse silicified fauna....This fauna represents Silurian Benthis Assemblage 5 and a relatively deep water carbonate ramp..."

Preservation: replaced with silica

Collection methods: bulk,

• "The fauna was discovered only as a result of routine processing of samples for conodonts."

Primary reference: R. Watkins. 1995. A silicified deep-water Silurian fauna from SE Wisconsin. Abstracts with Programs - Geological Society of America 27(3):94-94 [J. Alroy/M. Sommers/A. Clement]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 2846: authorized by John Alroy, entered by Mike Sommers on 21.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• The fauna consists of specimens mainly smaller than 3 mm.
unclassified
  -
Spirorbidae indet.
3 specimens representing 1 species
Trilobita
 Corynexochida - Illaenidae
Illaenidae indet. Hawle and Corda 1847 trilobite
illaenid sclerites
 Odontopleurida - Odontopleuridae
Odontopleuridae indet. Burmeister 1843 trilobite
odontopleurid sclerites
 Phacopida - Dalmanitidae
Dalmanitidae indet. Vogdes 1890 trilobite
dalmanitid sclerites
 Phacopida - Encrinuridae
Encrinuridae indet. Angelin 1854 trilobite
encrinurid sclerites
 Phacopida - Cheiruridae
Cheiruridae indet. Hawle and Corda 1847 trilobite
cheirurid sclerites
 Phacopida - Calymenidae
Calymenidae indet. Milne-Edwards 1840 trilobite
calymenid sclerites
 Proetida - Proetidae
Proetidae indet. Salter 1864 trilobite
proetid sclerites
Ostracoda
  -
Ostracoda indet. Latreille 1802 ostracod
2675 specimens: ostracods.
Strophomenata
 Orthotetida - Chilidiopsidae
Morinorhynchus sp. Havlicek 1965
 Strophomenida - Strophodontidae
Pholidostrophia sp. Hall and Clarke 1892
Rhynchonellata
 Protorthida - Skenidiidae
Skenidioides sp. Schuchert and Cooper 1931
 Orthida - Dalmanellidae
Resserella sp. Bancroft 1928
 Orthida - Platystrophiidae
Polychaeta
  -
Machaeridia indet. scale worm
54 specimens: sclerites
 Sabellida - Serpulidae
Serpulidae indet. Rafinesque 1835
3 specimens representing 1 species
Rostroconchia
 Conocardiida - Conocardiidae
Conocardiidae indet. Miller 1889
3 specimens representing 1 species
Bivalvia
 Ostreida - Pterineidae
Pterineidae indet. Miller 1877 oyster
1 specimens
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
5 specimens representing 3 species
Tentaculita
 Cornulitida - Cornulitidae
Cornulitidae indet. Fischer 1962
39 specimens representing 1 species
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
1294 specimens: fragments, representing 20 species.
Holothuroidea
  -
Holothuroidea indet. de Blainville 1834 sea cucumber
59 specimens: sclerites
Echinoidea
  -
Echinoidea indet. Leske 1778 sea urchin
18 specimens: spines and plates
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
11500 specimens: ossicles, "crinozoans."
Demospongea
 Lithistida -
Lithistida indet. demosponge
lithistid spicules
Hexactinellida
  -
Hexactinellida indet. Schmidt 1870 glass sponge
hexactinellid spicules
Heteractinida
  -
Heteractinida indet. Hinde 1888
heteractinid spicules
Anthozoa
 Tabulata -
Tabulata indet. tabulate coral
185 specimens representing 2 species
 Rugosa -
Rugosa indet. horn coral
36 specimens representing 2 species