Kra-I / Kravarsko-I, Lake Slavonia Viviparus beds (Pliocene of Croatia)

Where: Croatia (45.6° N, 16.0° E: paleocoordinates 45.5° N, 15.9° E)

• coordinate stated in text

• outcrop-level geographic resolution

When: Viviparus other zone, Pliocene (5.3 - 2.6 Ma)

• This publication introduces the new Cernikian regional stage, which corresponds to the Viviparus (=Paludina) beds, and is broadly congruent to the Pliocene and lower Pleistocene (4.5 m.y.a. to 2 m.y.a.).

•"The outcrop area is an active landslide laterally extending about 50 m. Except for a 3.4 m thick interval exposed at the northern limit of the landslide area, the bedding is largely disturbed. The former outcrop is dominated by a structure-less, grayish to yellowish clayey silt, with scattered plant remains. A 1.15 m thick unit of gray homogenous clay is intercalated in the lower part of the interval. The topmost 25% of this package displays fine-scale banding due to the intercalation of fine and medium grained sand. The sampled mollusc concentration occurs in the land-slide area, laterally to the outcrop, being strongly deformed and disjointed. It acted apparently as an inhomogeneity surface with the original stratigraphic position on top of the undisturbed interval."

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - large; unlithified, gray, yellow, muddy siltstone

• Paleolake Lake Slavonia. "The investigated region (Figure 1) represents the southern margin of the Sava depression, a NW-SE striking extensional structure filled by more than 5 km of predominantly siliciclastic Neogene deposits." "The Pannonian back-arc basin is a large Neogene extensional structure located between the Alpine, Dinaride and Carpathian fold-and-thrust belts in central and SE Europe."
• "The former outcrop is dominated by a structure-less, grayish to yellowish clayey silt, with scattered plant remains. A 1.15 m thick unit of gray homogenous clay is intercalated in the lower part of the interval. The topmost 25% of this package displays fine-scale banding due to the intercalation of fine and medium grained sand."

Size classes: macrofossils, mesofossils

Preservation: replaced with limonite

Collection methods: surface (float),

Primary reference: O. Mandic, T. Kurečić, T. A. Neubauer and M. Narzhauser. 2015. Stratigraphic and palaeogeographic significance of lacustrine molluscs from the Pliocene Viviparus beds in central Croatia. Geologia Croatica 68(3):179-207 [P. Novack-Gottshall/P. Novack-Gottshall]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 185963: authorized by Phil Novack-Gottshall, entered by Phil Novack-Gottshall on 31.05.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

• Molluscan fossils collected (gastropods and bivalves)
Gastropoda
 Architaenioglossa - Viviparidae
Viviparus kochanskyae Mandic et al. 2015 snail
 Rissooidea - Bithyniidae
Bithynia vukotinovici Brusina 1874 snail
Mis-spelled as Bythinia vukotinovici in Table 1, but correctly as Bithynia vukotinovici (Brusina, 1874: Family Bithyniidae Gray 1857) in Systematic Paleontology section
 Rissooidea - Lithoglyphidae
Lithoglyphus decipiens Brusina 1885 snail
 Sorbeoconcha - Melanopsidae
Microcolpia friedeli Brusina 1885 snail
 Neritoidea - Neritidae
Theodoxus semiplicatus Neumayr and in Herbich and Neumayr 1875 snail
 Valvatoidea - Valvatidae
Valvata subcarinata Brusina 1878 snail