Eucalyptocrinites crassus-Lyriocrinus melissa Assoc., Basal Waldron Unit 5 (Silurian of the United States)

Where: Indiana (39.5° N, 85.7° W: paleocoordinates 27.5° S, 51.7° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Waldron Shale Formation, Wenlock (433.4 - 427.4 Ma)

• Unit 5 (from bottom) of Frest (1977), which is one of five units within the basal 1 m of the Waldron.

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; pyritic, calcareous mudstone

• "Echinoderms are usually cups or calices..occasionally complete crowns...holdfasts common...no thickets...dissociated plates and other large debris not common, rarely concentrated into winnowed horizons, and generally abraded. Graptolites moderately common, finely disseminated carbonaceous matter present in small amounts...likely mid to outer Ba 4, only infrequently disturbed by storms. The low diversity is likely due to the very soft and relatively rapidly accumulating substrate..."

•2003.04.06: Environmenal call by S. Peters based on field experience with unit

• "Sparsely fossiliferous. The common lithology is a mudstone with between 5-20% skeletal debris. Finely disseminated pyrite and small pyrite nodules and crystal clusters..." Fig 45.3 indicates calcareous shale and siltstone for this community.q

Primary reference: T. J. Frest, C. E. Brett, and B. J. Witzke. 1999. Caradocian-Gedinnian echinoderm associations of Central and Eastern North America. Paleocommunities--a case study from the Silurian and Lower Devonian 638-783 [M. Foote/K. Koverman/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26856: authorized by Michael Foote, entered by Michael Foote on 06.11.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Hydrozoa
 Hydroida -
Inocaulis sp.
Inocaulis sp. Hall 1852
Anthozoa
 Favositida - Favositidae
Favosites occidentalis
Favosites occidentalis tabulate coral
 Rugosa -
Rugosa indet.
Rugosa indet. horn coral
Hexactinellida
 Amphidiscosa - Pelicaspongiidae
Twenhofelella waldroni n. sp.
Twenhofelella waldroni n. sp. Rigby et al. 1979 glass sponge
Pterobranchia
 Dendroidea - Acanthograptidae
Dictyonema sp.
Dictyonema sp. Hall 1851 graptolite
Crinoidea
 Cyathocrinida - Cyathocrinitidae
Cyathocrinites (Rugosocyathocrinites) pauli
 Cladida - Botryocrinidae
"Botryocrinus" polyxo
 Cladida -
Manicrinus erectus
 Diplobathrida - Rhodocrinitidae
Lyriocrinus melissa
 Diplobathrida - Dimerocrinitidae
Dimerocrinites occidentalis, Dimerocrinites inornatus
 Monobathrida - Eucalyptocrinitidae
Eucalyptocrinites crassus, Eucalyptocrinites tuberculatus
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
Rhynchonellata
 Spiriferida - Cyrtiidae
Eospirifer sp., Hedeina sp.
Eospirifer sp. Schuchert 1913
Hedeina sp. Boucot 1957
 Athyridida - Rhynchospirinidae
Homoeospira sp.
Homoeospira sp. Hall and Clarke 1893
 Athyridida - Meristellidae
Whitfieldella nitida
 Atrypida - Atrypidae
Atrypa reticularis
Atrypa reticularis Linnaeus 1758
 Orthida - Orthidae
Orthostrophia sp.
 Pentamerida - Parastrophinidae
Anastrophia internascens
 Rhynchonellida - Rhynchotrematidae
Stegerhynchus whitii
Strophomenata
 Orthotetida - Chilidiopsidae
"Coolinia sp." = Fardenia (Coolinia)
"Coolinia sp." = Fardenia (Coolinia) Bancroft 1949
unclassified
  -
Mollusca indet.
Mollusca indet. Linnaeus 1758
Deuteropoda
  -
Ostracoda indet.
Ostracoda indet. Latreille 1802 ostracod
"common and moderately diverse"
Trilobita
  -
Trilobita indet.
Trilobita indet. Walch 1771 trilobite
 Phacopida - Dalmanitidae
Dalmanitidae indet.
Dalmanitidae indet. Vogdes 1890 trilobite
Chlorophyceae
  - Receptaculitidae
Ischadites subturbinatus