Search results for "PLEISTOCENE"

Il popolamento umano della Sicilia: una revisione interdisciplinare

2014

Riassunto — La questione del popolamento umano pleistocenico della Sicilia e delle coste del Mediterraneo occidentale implica la ricostruzione delle rotte migratorie seguite dall’uomo e dalle faune e delle complesse dinamiche geologiche del bacino del Mediterraneo centrale. Anche se la più accreditata via di migrazione comune di faune e uomo è quella settentrionale, che prevede il superamento dell’area dello stretto di Messina, diversi autori, sulla base di dati archeologici, hanno ipotizzato un popolamento precoce ed una direttrice meridionale, dall’Africa, attraverso momenti di percorribilità del Canale di Sicilia. Questa ipotesi è stata più volte esplorata per poi essere accantonata, anc…

Prima segnalazione di Carcharodon carcharias (Linnaeus, 1758) (Chondrichthyes Lamnidae) nei sedimenti pleistocenici di Balestrate (Palermo, Sicilia)

2010

40 Ar/ 39 Ar ages of fallout tephra layers and volcaniclastic deposits in the sedimentary succession of the western Woodlark Basin, Papua New Guinea:…

2001

Outlines of the Quaternary geology of Latvia

2014

Vertical movements of the Paris Basin (Triassic-Pleistocene): from 3D stratigraphic database to numerical models

2003

PALEOENVIRONMENTAL RECONSTRUCTION ON LATE CALABRIAN STAGE SEDIMENTS FROM THE BELICE VALLEY (SOUTHWESTERN SICILY - ITALY) BASED ON OSTRACODA

2022

The Middle Pleistocene Transition is the most recent re-organization of the climate system, happened between 1.2 and 0.7 Ma. Marine sediments outcropping in Sicily have been a relevant source of information on the paleoclimatic and paleoenvironmental evolution of the Mediterranean Sea, over this time window. Among others, previous studies in Sicily identified and described the very cold phase and the marked sea level fall associated with the top MIS 22, which is lithologically expressed by a calcarenite bed colonized by the Arctica islandica northern guest. Here we investigate ostracod assemblages from marine sediments in the southwestern Sicily. Sediments, ascribed to the late Calabrian St…

Biogeography of the Pleistocene pleniglacial malacofaunas in Europe. Stratigraphic and climatic implications

1990

Abstract As determined by Lozek, malacological associations are significant of a particular vegetal environment. In Quaternary sequences, different types of associations are recognized which can be assimilated to the present types of malacofaunas. There are associations of grass group, of forest group and of the ecotone of these two biogeographical entities. On the European scale, in Pleistocene sequences, the interglacial faunas indicate similarly the same differences as today, being of stratigraphic interest. On the contrary, pleniglacial faunas, which are mainly preserved in the loess belt, seemed not interesting for stratigraphy since they indicate more generalized and more homogeneous …

I popolamenti faunistici pleistocenici della Sicilia.

2008

Return flight to the Canary Islands – The key role of peripheral populations of Afrocanarian blue tits (Aves: Cyanistes teneriffae) in multi-gene rec…

2012

Abstract Afrocanarian blue tits (Cyanistes teneriffae) have a scattered distribution on the Canary Islands and on the North African continent. To date, the Canary Islands have been considered the species’ main Pleistocene evolutionary center, but their colonization pathways remain uncertain. We set out to reconstruct a dated multi-gene phylogeny and ancestral ranges for Cyanistes tit species including the currently unstudied, peripheral Libyan population of C. t. cyrenaicae. In all reconstructions the most easterly and westerly peripheral populations (in Libya and on La Palma) represented basal offshoots of C. teneriffae. These two peripheral populations shared all four major indels and dif…

Pleistocene and Holocene aeolian sediments of different location and geological history: A new insight from rounding and frosting of quartz grains

2014

Abstract Rounding and frosting of quartz grains in aeolian sediments of the known stratigraphic position and unique geological setting was explored in Finnish, Estonian, Latvian, and Polish localities and in Fuerteventura Island. The aim of the study is to characterize the variability of the spatial pattern of rounding and frosting of quartz grains in the sandy (0.5–0.8 mm) fraction and to evaluate the factors influencing it. The relationships between rounded and non-abraded, as well as matt- and shiny-type quartz grains were calculated for 159 samples and evaluated against the aeolian subenvironment, substratum and presumed age of the locations. The obtained relations do not confirm meridi…