Paleosol Molluscs, Torre Picchio, S. Maria di Ciciliano Fm, Montecastrilli (Pliocene to of Italy)

Also known as Torre di Picchio

Where: Umbria, Italy (42.7° N, 12.5° E: paleocoordinates 42.6° N, 12.4° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Santa Maria di Ciciliano Formation, Pliocene to Pliocene (5.3 - 0.0 Ma)

• A number of samples within the section were taken and each has been entered separately. Date based on Macromammals and molluscs - thought to be Early Pleistocene in age, but some taxa are Pliocene, indicating either longer survival in Italy than elsewhere, or that the Formation is slightly earlier than previously thought (in which case it marks the first appearance of some Early Pleistocene taxa).

Environment/lithology: fluvial

• Three separate deposits in the section - lowermost is two meters of coarse sands which are yellow, cross-stratified with levels or lenses of clayey pebbles, fine sand, silt and clay. Oxidised crusts and fossil wood stumps are common features. Thought to be a meandering channel deposit. Above it is one meter of silts and clays, the first 35 cm of which are silty, brownish, with evident root traces and therefore considered a palaeosol formed in a swampy environment. The last 70 cm are grey clays refered to a lacustrine environment.
• Swampy palaeosol (silty pedogenic level).

Size classes: macrofossils, mesofossils, microfossils

Collection methods: bulk, sieve,

• Plant remains indicate a Mean Annual Temperature of 12 +_1 Centigrade (close to modern temps for Umbria) with higher precipitation than at present, and no marked summer drought. Cooler temps than those idicated by Late Pliocene plant remains from the same area.

•Molluscs suggest a marshy to swampy environment, with influxes of slow running waters.

Primary reference: O. Girotti, L. Capasso Barbato, D. Esu, E. Gliozzi, T. Kotsakis, E. Martinetto, C. Petronio, R. Sardella, and E. Squazzini. 2003. The section of Torre Picchio (Terni, Umbria, Central Italy): A Villafranchian site rich in vertebrates, molluscs, ostracods and plants. Rivista Italiana di Paleontologia e Stratigrafia 109(1):77-98 [A. Turner/H. O'Regan/H. O'Regan]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 51766: authorized by Alan Turner, entered by Hannah O'Regan on 16.06.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

• Vertebrates are given as one list for the whole outcrop. Plant remains and molluscs are subdivided/subsampled and have been entered as subcollections.
unclassified
  -
Bivalvia
 Cardiida - Corbiculidae
 Cardiida - Sphaeriidae
Pisidium sp. Pfeiffer 1821 pea clam
 Unionida - Unionidae
Anodonta sp. freshwater mussel
Gastropoda
 Sorbeoconcha - Emmerciidae
 Sorbeoconcha - Hydrobiidae
Prososthenia sp. Neumayr 1869 snail
Belgrandia sp. Bourguignat 1870 snail
 Sorbeoconcha - Bithyniidae
Bithynia leachi snail
with many opercula.
 Heterostropha - Valvatidae
Valvata (Valvata) cristata Müller 1774 snail
Valvata (Cincinna) piscinalis Müller 1774 snail
 Heterostropha - Lymnaeidae
 Heterostropha - Planorbidae
 Stylommatophora - Helicidae
Helicidae indet. Rafinesque 1815 slug