Tajna Beds at S-D boundary sections in Dniestr Valley (Devonian to of Ukraine)

Where: Ukraine (49.1° N, 25.4° E: paleocoordinates 18.8° S, 10.6° E)

• coordinate based on political unit

• local area-level geographic resolution

When: Tajna Beds Formation, Helderberg to Helderberg (416.0 - 410.8 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; dolomitic, argillaceous limestone and dolomitic, argillaceous marl

• Several rock types described: "A unit of limestone is overlain by a sequence of alternating calcareous-dolomite marls and dark fragmentary mudstones with large clayey limestone concretions grouped into distinct bands. (1.8 m) ...Fine-grained argillaceous limestones with bands of silty mudstones; alternating calcareous-dolomitic clayey marls and interbedded dolomitic argillaceous limestones and calcareous marls (8.1 m)...Interbedded limestones and marls (8.3 m)...Nodular limestones, dolomitic argillaceous marls, dolomitic limestones (6.2 m)...nodular limestones, biogenic limestones and marls (1.7 m)...marls and rare limestones (10.4 m)...Limestones with bands of marls and mudstones (1.3 m)...alternating marls and limestones (12.7 m)...rhythmic alternation of limestones and marls (7 m)..."

Collection methods: Several outcrops combined.

Primary reference: O. I. Nikiforova. 1977. Podolia. In A. Martinsson (ed.), The Silurian-Devonian boundary (IUGS Publication, Series A, Number 5) 52-64 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 13875: authorized by Michael Foote, entered by Michael Foote on 30.04.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita indet. Walch 1771 trilobite
 Phacopida - Acastidae
Acastella prima trilobite
 Proetida - Proetidae
 Palaeocopida -
Brachiopoda indet. Cuvier 1805
 Productida - Strophochonetidae
 Strophomenida - Rafinesquinidae
 Strophomenida - Amphistrophiidae
 Athyridida - Athyrididae
"Protathyris infantile" = Pseudoprotathyris infantilis
"Protathyris infantile" = Pseudoprotathyris infantilis Kozlowski 1929
 Spiriferinida - Cyrtinidae
 Spiriferida - Cyrtiidae
 Spiriferida - Ambocoeliidae
 Spiriferida - Delthyrididae
 Pentamerida - Clorindidae
 Protorthida - Skenidiidae
"Skenidium lewisi" = Scenidium lewisi
"Skenidium lewisi" = Scenidium lewisi Davidson 1883
 Atrypida - Atrypidae
 Atrypida - Lissatrypidae
Septatrypa secreta, "Lissatrypoidea leprosa" = Lissatrypa
Septatrypa secreta Kozlowski 1929
"Lissatrypoidea leprosa" = Lissatrypa
 Rhynchonellida - Hebetoechiidae
Sphaerirhynchia gibbosa
[entered as Spherirhynchia gibbosa]
 Orthida - Dalmanellidae
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
 Ostreida - Pterineidae
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Bryozoa indet. Ehrenberg 1831
 Trepostomida -
 Cyclostomata -
Hernodia sp. Hall 1883
 Trepostomata -
"Lioclema gloria" = Leioclema
"Lioclema gloria" = Leioclema
Conodonta indet. Eichenberg 1930 conodont
 Ozarkodinida -
 Graptoloida -
Linograptus sp. graptoloid
 Bireclinata - Monograptidae
Crinoidea indet. Miller 1821 Sea lily
 Pisocrinida - Pisocrinidae
 Monobathrida -
Camarocrinus sp. Hall 1879 Sea lily
 Favositida - Favositidae