Howellella gr. angustiplicata-Tiverina Community, Lochkovian, Central Taimyr (Devonian of Russian Federation)

Where: Russian Federation (73.8° N, 91.0° E: paleocoordinates 18.6° N, 4.9° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Lochkovian (419.2 - 410.8 Ma)

• Upper Belyi Kamen Beds

Environment/lithology: marine; gray, argillaceous limestone

• "The 500 m thick section is built up predominantly of argillaceous carbonate deposits. The base contains gypsum, argillaceous dolomites, siltstones (Belyi Kamen subhorizon, Ust' Taryeya horizon, the equivalent of the Lower Lochkovian) grading up section into rhythmically interbedded carbonate and argillaceous rocks (the Uryun and Tolbat subhorizons of the Ust' Tareya horizon; Daksan, Yunkhoda, Taribigai subhorizons, the Zlobin horizon; the Trigonirhynchia postventricos and Favosites regularissimus zones, equivalents of the Lochkovian-Zlichovian), there are also variegated siltstones, marls, dolomites (the Wijdeaspis arctica zone, the end of the Lower Devonian. The section shows a cyclic development...(carbonate beds with basal argillaceous units) while the general trend was regressive-transgressive-regressive...absence of channel facies...There are a number of communities showing a trend in the development of environments from gypsiferous lagoons to open marine basins, beginning basally with A and extending upwards into F, namely: A. Fish-Phyllopod; B. Lingula-Phyllopod; C. Pelecypod-Phyllopod; D. Eurypterid-Pelecypod; E. Howellella-Tiverina; F. Rhombopora-Hebetoechia...hypersaline at bottom to normal marine at top." "...belonging to a nearshore, shallow water, lagoonal facies. It is withini the inner zone, where gypsiferous dolomite occurs. The fossils occur chiefly as scattered individuals, covered with argillaceous material, on bedding planes. Most of the brachiopods are still articulated, suggesting relatively quiet water, but enough turbulence to disarticulate the crinoids. The overall faunal composition and stratigraphic position...indicate BA 2"
• See geology. "Gray, detrital, thin-bedded (2-3 cm) limestone..."

Primary reference: S. V. Cherkesova. 1999. Lower Early Devonian communities of Taimyr. In A. J. Boucot and J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 458-461 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26672: authorized by Michael Foote, entered by Michael Foote on 23.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Ostracoda
 Palaeocopida -
 Leperditicopida - Leperditiidae
Leperditia sp. Rouault 1851 ostracod
Strophomenata
 Strophomenida - Stropheodontidae
Rhynchonellata
 Athyridida - Athyrididae
 Spiriferida - Delthyrididae
 Rhynchonellida - Innaechiidae
"? Hebetoechia aff. kuzmini" = Dubovikovia kuzmini
"? Hebetoechia aff. kuzmini" = Dubovikovia kuzmini Cherkesova 1968
Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
Gastropoda
  -
Gastropoda indet. Cuvier 1797 snail
Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Pteraspidomorpha
  - Thelodontidae
Nostolepis sp. Pander 1856
Conodonta
  -
Conodonta indet. Eichenberg 1930 conodont
Osteichthyes
 Acanthothoraci -
Acanthothoraci indet. Stensiƶ 1944 armour-plated fish
Radotinids (small, rare)
Crinoidea
  -
Crinoidea indet. Miller 1821 Sea lily
Demospongea
 Chaetetida - Tiverinidae
Tiverina spp. Sokolov and Tesakov 1968 demosponge
Anthozoa
 Favositida - Favositidae
Favosites sp. Lamarck 1816 tabulate coral