Edriocrinus-Brachiocrinus Assoc., Lower Helderberg Group (Devonian of the United States)

Where: New York (42.7° N, 74.3° W)

• Paleocoordinates: 26.7° S, 56.3° W (Wright 2013)

• coordinate based on political unit

• basin-level geographic resolution

When: Helderberg Group, Lochkovian (419.2 - 410.8 Ma)

• "Lower Devonian (Gedinnian); lower Helderberg Group, Kalkberg and New Scotland Formations"

Environment/lithology: marine; burrowed, argillaceous, cherty/siliceous lime mudstone and micaceous, argillaceous, cherty/siliceous packstone

• "In general, depositional rates appear to have been low. Much of the muddy carbonate is burrow-mottled, and most fossils are disarticulated to slightly fragmented....Presence of distal sotrm beds, as well as the rare occurrence of receptaculitid(?) algae in the New Scotland suggest only moderate deptsh within the photic zone. [Brachiopods are BA 4-5.]"
• "The units are nodular to tabular argillaceous lime mudstones, wackestones and packstones with some distinct beds of black chert nodules, indicating generally low energy muddy sea floor conditions. Distinctive banded lithologies, particularly in the Kalkberg area, appear to reflect alternating beds of storm-winnowed skeletal wackestone/packstone and finer grained, slightly dolomitic 'background' mudstones; some thin shale beds record distal mud tempestites. The source of silica comprising black cherts is uncertain, but it probably reflects biogenic opaline silica in part: siliceous sponge spicules are frequently found within chert nodules int he Kalkberg."

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 26851: authorized by Michael Foote, entered by Michael Foote on 05.11.2002

Creative Commons license: CC0 (CC0)

Taxonomic list

Show authors, comments, and common names
Demospongiae
 Streptosclerophorida - Hindiidae
Hindia sp.
Hindia sp. Duncan 1879 demosponge
Anthozoa
 Stauriida - Streptelasmatidae
Enterolasma sp.
Enterolasma sp. Simpson 1900 horn coral
Rhynchonellata
 Rhynchonellida - Stenoscismatidae
Stenoscisma sp.
Stenoscisma sp. Conrad 1839
 Rhynchonellida - Uncinulidae
Uncinulus sp.
Uncinulus sp. Bayle 1878
 Spiriferida - Cyrtiidae
Macropleura macropleura
 Spiriferida - Delthyrididae
Howellella sp.
Howellella sp. Kozlowski 1946
 Spiriferida - Cyrtinopsidae
Megakozlowskiella sp.
 Orthida - Rhipidomellidae
Dalejina sp.
Dalejina sp. Havlicek 1953
 Orthida - Dalmanellidae
Isorthis sp.
Isorthis sp. Kozlowski 1929
Strophomenata
 Strophomenida - Rafinesquinidae
Leptaena sp.
Leptaena sp. Dalman 1828
 Strophomenida - Leptostrophiidae
"Leptostrophia becki" = Leptostrophia beckii
"Leptostrophia becki" = Leptostrophia beckii Hall 1857
 Strophomenida - Strophonellidae
Strophonella leavenworthana
Stenolaemata
 Cystoporata - Fistuliporidae
Fistulipora indet.
Fistulipora indet. McCoy 1850
 Fenestrata -
Fenestrata indet.
Fenestrata indet. Elias and Condra 1957
 Trepostomata -
Trepostomata indet.
Trepostomata indet. Ulrich 1882
ramose forms
Gastropoda
 Euomphalina - Platyceratidae
Platyceratidae indet.
Platyceratidae indet. Hall 1859 snail
Trilobita
 Phacopida - Dalmanitidae
Dalmanitidae indet.
Dalmanitidae indet. Vogdes 1890 trilobite
Crinoidea
 Monobathrida - Marsupiocrinidae
Marsupiocrinus (Marsupiocrinus) tentaculatus
 Monobathrida - Melocrinitidae
Ctenocrinus stoloniferus
 Camerata -
Coronocrinus polydactylus
  -
Aspidocrinus sp.
Aspidocrinus sp. Hall 1858 Sea lily
 Flexibilia - Edriocrinidae
Edriocrinus pociliformis, Edriocrinus occidentalis
 Sagenocrinida - Lecanocrinidae
Lecanocrinus (Lecanocrinus) magnaradialis
 Sagenocrinida - Icthyocrinidae
Clidochirus schucherti
 Myelodactylida - Myelodactylidae
Brachiocrinus nodosarius