Edriocrinus-Brachiocrinus Assoc., Lower Helderberg Group: Lochkovian, New York

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Anthozoa - Stauriida - Streptelasmatidae
Enterolasma sp. Simpson 1900
Demospongiae - Streptosclerophorida - Hindiidae
Hindia sp. Duncan 1879
Crinoidea
Aspidocrinus sp. Hall 1858
Crinoidea - Edriocrinidae
Edriocrinus pociliformis
Edriocrinus occidentalis
Crinoidea - Sagenocrinida - Lecanocrinidae
Lecanocrinus (Lecanocrinus) magnaradialis
Crinoidea - Sagenocrinida - Icthyocrinidae
Clidochirus schucherti
Crinoidea - Myelodactylida - Myelodactylidae
Brachiocrinus nodosarius
Crinoidea
Coronocrinus polydactylus
Crinoidea - Monobathrida - Melocrinitidae
Ctenocrinus stoloniferus
Crinoidea - Monobathrida - Marsupiocrinidae
Marsupiocrinus (Marsupiocrinus) tentaculatus
Gastropoda - Euomphalina - Platyceratidae
Platyceratidae indet. Hall 1859
Strophomenata - Strophomenida - Strophonellidae
Strophonella leavenworthana
Strophomenata - Strophomenida - Leptostrophiidae
Leptostrophia becki (Hall 1857)
recombined as Leptostrophia beckii
Strophomenata - Strophomenida - Rafinesquinidae
Leptaena sp. Dalman 1828
Rhynchonellata - Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
Rhynchonellata - Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
Rhynchonellata - Spiriferida - Cyrtiidae
Macropleura macropleura
Rhynchonellata - Spiriferida - Delthyrididae
Howellella sp. Kozlowski 1946
Rhynchonellata - Spiriferida - Cyrtinopsidae
Megakozlowskiella sp. (Boucot 1957)
Rhynchonellata - Rhynchonellida - Stenoscismatidae
Stenoscisma sp. Conrad 1839
Rhynchonellata - Rhynchonellida - Uncinulidae
Uncinulus sp. Bayle 1878
Stenolaemata - Cystoporata - Fistuliporidae
Fistulipora indet. McCoy 1850
Stenolaemata - Fenestrata
Fenestrata indet. (Elias and Condra 1957)
synonym of Fenestelloidea
Stenolaemata - Trepostomata
Trepostomata indet. Ulrich 1882
ramose forms
Trilobita - Phacopida - Dalmanitidae
Dalmanitidae indet. Vogdes 1890
see common names

Geography
Country:United States State/province:New York
Coordinates: 42.7° North, 74.3° West (view map)
Paleocoordinates:35.1° South, 33.5° West
Basis of coordinate:based on political unit
Geographic resolution:basin
Time
Period:Devonian Epoch:Early/Lower Devonian
Stage:Lochkovian 10 m.y. bin:Devonian 1
Key time interval:Lochkovian
Age range of interval:419.20000 - 410.80000 m.y. ago
Stratigraphy
Geological group:Helderberg
Stratigraphy comments: "Lower Devonian (Gedinnian); lower Helderberg Group, Kalkberg and New Scotland Formations"
Lithology and environment
Primary lithology:burrows argillaceous,cherty/siliceous lime mudstone
Secondary lithology:micaceous argillaceous,cherty/siliceous packstone
Includes fossils?Y
Includes fossils?Y
Lithology description: "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."
Environment:marine indet.
Geology comments: "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.]"
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Database number:26851
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-11-05 13:49:05 Last modified:2006-09-13 14:01:03
Access level:the public Released:2002-11-05 13:49:05
Creative Commons license:CC BY
Reference information

Primary reference:
4379. 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]