Zelking (Lower Austria) - Pielach Formation (Oligocene of Austria)

Where: Lower Austria, Austria (48.2° N, 15.3° E: paleocoordinates 46.3° N, 14.1° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Pielach Formation, Chattian (28.1 - 23.0 Ma)

• STRATIGRAPHY: The lower part of the outcrop exhibits Late Kiscelian to early Early Egerian, limnic pelites of the Pielach Formation overlying the crystalline basement. Sedimentation of the pellites continues into the Early Egerian, when paralic coals and a rich mollusc fauna first occur. The Melk Formation conformably overlies the Pielach Formation here. AGE: The Pielach Formation can be dated o the lower Polle Bozone Ng. Z. 1., ranging from the Kiscellian to the Early Egerian. The Early Egerian age can be inferred for the upper part of the Pielach Formation, based on its interfingering with the Melk and Linz Formations. Assigned here to Late Kiscellian-Early Egerian = Chattian.

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal; poorly lithified, peloidal, shelly/skeletal mudstone

• Composition clearly indicates lagoonal conditions. Fauna flourished on the muddy bottom of a shallow embayment. The presence of fluvial-estuarine taxa suggest major fluvial influx. Suboptimal conditions - probably caused by the high input of organic debris, low salinities and/or poor oxygenation - appear likely. The community resembles that of shallow lagoons and estuaries.
• Limnic pelites, rich molluscan fauna, coquina. Lithification not mentioned in text, but assigned on the basis of photographic plates - specimens appear to derive from at least a poorly lithified or lithified sediment.

Size class: macrofossils

Collection methods: quarrying,

• Lists obtained from previous accounts and material obtained from collections at Inst. of Pal. Vienna, Geol. Surv. Austria Vienna, and Mus. Nat. Hist. Vienna. At least part of the outcrop is no longer accessible.

Primary reference: M. Harzhauser and O. Mandic. 2001. Late Oligocene gastropods and bivalves from the Lower and Upper Austrian Molasse Basin. Osterreichische Akademie der Wissenschaften, Schriftenreihe der Erdwissenschaftlichen Komimissionen 14:671-795 [A. Miller/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 55244: authorized by Austin Hendy, entered by Austin Hendy on 30.09.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Exhaustive for Mollusca. Nomenclature follows modern usage, with revisions and new taxonomic descriptions in present manuscript. KEY: r - rare; f - frequent; a - very abundant
Gastropoda
 Neritoidea - Neritidae
Theodoxus crenulatus Klein 1853 snail
"Neritina picta" = Agapilia picta Férussac 1825 snail
 Cerithioidea - Potamididae
"Tympanotonos margaritaceus" = Mesohalina margaritaceus
"Tympanotonos margaritaceus" = Mesohalina margaritaceus Brocchi 1814 horn snail
Subspecies: Tympanotonos margaritaceus calcaratus
 Cerithioidea - Turritellidae
Turritella (Haustator) venus d'Orbigny 1852 turret shell
 Cerithioidea - Batillariidae
Granulolabium plicatum Bruguiére 1792 snail
 Cerithioidea - Melanopsidae
Melanopsis impressa Krauss 1852 snail
Bivalvia
 Mytilida - Mytilidae
 Pholadida - Teredinidae
Teredo sp. Linnaeus 1758 clam
 Cardiida - Corbiculidae
Polymesoda subarata Bronn 1837 clam
Subspecies: Polymesoda subarata sowerbii
 Cardiida - Cardiidae