Torrente Meduna sample 15: Tortonian, Italy

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Gastropoda - Turritellidae
Protoma rotifera (Deshayes 1832)
52 specimens
Gastropoda - Neogastropoda - Ancillariidae
Ancilla glandiformis (Lamarck 1810)
3 specimens
recombined as Amalda glandiformis
Gastropoda - Heterostropha - Architectonicidae
Heliacus fallaciosus
1 specimen
Bivalvia - Arcida - Arcidae
Anadara diluvii (Lamarck 1805)
1 specimen
recombined as Scapharca (Scapharca) diluvii
Subspecies: Anadara diluvii pertransversa
Bivalvia - Pectinida - Pectinidae
Chlamys radians (Nyst and Westendorp 1839)
1 specimen
recombined as Aequipecten radians
Bivalvia - Pholadida - Corbulidae
Corbula gibba (Oliva 1792)
4 specimens
recombined as Corbula (Varicorbula) gibba
see common names

Geography
Country:Italy State/province:Pordenone County:Friuli
Coordinates: 46.2° North, 12.8° East (view map)
Paleocoordinates:46.0° North, 12.6° East
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Neogene Epoch:Miocene
Stage:Tortonian 10 m.y. bin:Cenozoic 6
Key time interval:Tortonian
Age range of interval:11.62000 - 7.24600 m.y. ago
Stratigraphy
Formation:Maraldi Sandstone
Local section:Torrente Meduna
Stratigraphic resolution:bed
Stratigraphy comments: Miocene Torento-Meduna sequence unconformably overlies the Eocene Clauzetto Flysch (Flysch di Clauzetto) and is composed of Preplans Sandstone, Zouf marl, Rugo Mizza Sandstone, San Martino Calcarenite, Torrente Meduna Siltstone, Maraldi Sandstone, Bier Puddingstone, and Montello Conglomerate. Thickness of the Maraldi Sandsone is approximately 220 m.
Lithology and environment
Primary lithology: silty marl
Includes fossils?Y
Lithology description: Maraldi Sandstone "consists of fine to very fine-grained, yellowish sandstone, thickening upwards, alternating with darker, micaceous silty-marl forming beds of various thickness".
Environment:prodelta
Geology comments: "In the absence of age-diagnostic species, a Tortonian age was inferred on the basis of stratigraphic position".
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:all macrofossils
Collection methods:bulk,field collection
Collection size:62 specimens
Rock censused:30 cm3 (volume)
Reason for describing collection:paleoecologic analysis
Collection method comments: Based on single bulk samples, about 30 cubic centimetres each. Grain size data also provided.
Taxonomic list comments:In enterers opinion the taxonomic list is representative of molluscan taxa, however no non-mollusca taxa are detailed. The reference states "Megafauna, mainly consisting of molluscs, is particularly abundant in the silty-marl levels where bivalves are prevalent; arenaceous beds contain diverse gastropod assemblages".
Metadata
Also known as:Protoma rotifera community sample 15
Database number:37366
Authorizer:A. Hendy Enterer:A. Hendy
Modifier:A. Hendy Research group:marine invertebrate
Created:2004-03-14 10:16:57 Last modified:2013-11-25 13:37:23
Access level:the public Released:2004-03-14 10:16:57
Creative Commons license:CC BY
Reference information

Primary reference:

10020. M.P. Bernasconi and E. Robba. 1993. Molluscan palaeoecology and sedimentological features: an integrated appraoch from the Miocene Meduna section, northern Italy. Palaeogeography, Palaeoclimatology, Palaeoecology 100:267-290 [A. Miller/A. Hendy/A. Hendy]