Rybalski quarry (Eocene of Ukraine)

Where: Ukraine (48.4° N, 35.4° E: paleocoordinates 47.9° N, 30.9° E)

• coordinate estimated from map

When: Obukhov Formation, Priabonian (38.0 - 33.9 Ma)

• upper Eocene

•deposits with sponges occur in the middle–upper Eocene of the central Ukraine region, and represent the Kiev (Lutetian–Bartonian) and Obukhov formations (Priabonian)

Environment/lithology: deep subtidal; sandstone and claystone

• we hypothesize that the assemblage studied inhabited shallow waters with an estimated depth of c. 100 m.
• yellowish grey, detrital, non-glauconitic clayey sand; overlying this unit are dark grey–green and brown silty sands and clays, often glauconitic and very rich in siliceous sponge spicules and fragments of lithistid sponges

Size classes: mesofossils, microfossils

• foraminifera, corals, molluscs, brachiopods, fish otoliths and rhodoliths

Primary reference: M. Lukowiak, A. Pisera, T. Stefanska and V. Stefanskyi. 2022. Hi diversity of siliceous sponges in Western Tethyan areas during the Eocene: Palaeobiogeographical, ecological and taxonomic significance. Papers in Palaeontology 8(1):e1416 [B. Seuss/B. Seuss]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 229619: authorized by Barbara Seuss, entered by Barbara Seuss on 20.03.2023

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
unclassified
  -
cf. Lerouxia digitata, Lithistidae indet., Placospongia sp., Diplastrella megastellata, Zyzzya sp., Ectyonopsis sp., Bubarida indet., Placinolopha sarai, Agelas sp.
Lithistidae indet.
Rhizoclone-bearing lithistids
Demospongiae
 Spirophorida - Samidae
Samus anonymus
Samus anonymus demosponge
 Tetralithistida - Theonellidae
Theonellidae indet.
Theonellidae indet. Lendenfeld 1904 demosponge
 Tetralithistida - Phymaraphiniidae
Phymaraphiniidae indet.
Phymaraphiniidae indet. Schrammen 1910 demosponge
 Monalithistida - Vetulinidae
Vetulina sp.
Vetulina sp. demosponge
 Pachastrellida - Pachastrellidae
Pachastrellidae indet., Triptolemma sp.
Pachastrellidae indet. Carter 1875 demosponge
Triptolemma sp. de Laubenfels 1955 demosponge
 Ancorinida - Geodiidae
Geodia sp., Erylus sp.
Geodia sp. Lamarck 1815 demosponge
Erylus sp. Gray 1867 demosponge
 Ancorinida - Ancorinidae
Stelletta sp.
Stelletta sp. Schmidt 1862 demosponge
 Clavulina - Clionaidae
Alectona millari
Alectona millari demosponge