Wyniki wyszukiwania - BazTech

1

Mesolithic occupations and environments on the Island of Ikaria, Aegean, Greece

Sampson A., Kaczanowska M., Kozłowski J. K., Athanassas C., Bassiakos Y., Liritzis I., Laskaris N., Tsermegas I.

Folia Quaternaria

|

2012

|

nr 80

1--87

EN

The most important Mesolithic site on the Island of Ikaria, Kerame 1, extends 80 m along the sloping edge of the cliff and is up to 40 m wide. The site is a sum of repeated sojourns of Mesolithic groups that had left behind concentrations of lithic artefacts, which were subsequently displaced by post-depositional agents, first of all by erosion. As a result, the site reveals now a large concentration of finds in Trenches E, C, and G. Moreover, post-depositional agents caused the destruction of permanent features such as the hearths associated with the various khsemenitsas, or — possibly — stone rings surrounding the dwelling structures. Only in trenches D, B and E the remains of a circular stone rings, probably around hearths, were registered. The lithic industry of Kerame 1 displays considerable similarity to the site of Maroulas on Kythnos; the techno-morphological differences are, probably, the effect of differing raw materials structure at Kerame 1 and at Maroulas. At Kerame 1, the distant interregional contacts and the influx of extralocal raw materials (documented by the flow of obsidian nodules from Melos and Yali) caused that production in a full cycle was carried out on-site. Thus, there was no specialization of lithic production, and unworked nodules of raw material were exploited in the particular social clusters in a full cycle, whose outcome were tools to be used by a given unit. Regretfully, because organic materials (also bones) have not been preserved we have no data to determine seasonality at Kerame l. Nevertheless, we can say with all certainty that Mesolithic groups visiting Kerame 1 were mobile, which is evidenced by the network of interregional contacts. The most noticeable similarity between Kerame 1 and Maroulas can be accounted for by the chronological closeness of the two sites. The AMS determinations from Maroulas concentrate in the first half of the 9th millenium cal. BC (Facorellis et a1. 2010). Similarly, the dates from obsidian dehydration from Kerame 1 (if their broad standard deviation is overlooked) correspond to the first half of the 9th millenium cal. BC.

2

Malakofauna osadów jeziornych torfowiska Gajlik na Pojezierzu Sejneńskim (północno-wschodnia Polska)

Alexandrowicz W. P., Żurek S.

Geologia / Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie

|

2010

|

T. 36, z. 4

491-504

PL

Analizie malakologicznej poddano skorupki ślimaków i małży występujące w gytiach wapiennych i kredach jeziornych wypełniających torfowisko Gajlik na Pojezierzu Sejneńskim. W sześciu analizowanych próbkach stwierdzono występowanie 13 gatunków mięczaków wodnych. Obserwowane zmiany składu i struktury zespołu mięczaków uzupełnione wynikami analiz palinologicznych i radiometrycznych pozwoliły na rekonstrukcję ewolucji torfowiska Gajlik w okresie późnego glacjału i dolnego holocenu. Skorupki mięczaków występowały wyłącznie w osadach związanych z cieplejszym i okresami (interfaza alleröd oraz preborealna i borealna faza holocenu). Nie pojawiały się one natomiast w osadach zimnych okresów późnego glacjału.

EN

Malacological analysis was conducted on snails and bivalve shells present in calcareous gytia and lacustrine chalk of the Gajlik mire in the Sejny Lake District. Thirteen species of water molluscs were identified within six analyzed samples. Changes observed in the structure and composition of molluscs, supplemented by palynological data, and the results of radiocarbon datings allowed for the reconstruction of the mire's evolution during Late Glacial and Early Holocene period. Molluscs' shells occurred solely in sediments associated with warmer periods (interphase Alleröd and Preboreal-Boreal phases of Holocene). Additionally, they were not present in sediments associated with cold Late Glacial periods.

3

[Delta^18]O and [delta^13]C isotope investigation of the Late Glacial and early Holocene biogenic carbonates from the Lake Lednica sediments, western Poland

Apolinarska K.

Acta Geologica Polonica

|

2009

|

Vol. 59, no. 1

111-121

EN

Stable isotope composition ([delta^18]O and [delta^13]C) of biogenic carbonates derived from the Lake Lednica sediments at Rybitwy, western Poland, was applied to obtain data on climatic changes during the Late Glacial and early Holocene. A wide range of carbonates occurring in the sediments was analysed for [delta^18]O and [delta^13]C records, including shells of several gastropod species, the bivalve genus Pisidium and carapaces of ostracods belonging to the subfamily Candoninae. The [delta^18]O and [delta^13]C records reveal changes commonly observed for the Late Glacial and early Holocene with the exception of the low oxygen isotope values of the Bolling and Allerod Interstadials. The latter is interpreted as a consequence of [^18]O-depletion of the lake water resulting from gradual melting of the dead ice that still filled the deepest parts of the Lake Lednica valley during the period described. The Younger Dryas Stadial begins with the isotopically lightest values in the sequence; however, due to the [^18]O-depleted values of the Allerod Interstadial the Allerod/Younger Dryas boundary is poorly marked. The Younger Dryas/Preboreal transition is documented by a significant shift in [delta^18]O values of about 2-3[per mil], resulting from an increase in the mean annual temperature. The [delta^13]C record reflects the productivity level in the lake, with [^13]C-enriched carbonates during the Bolling and Allerod Interstadials, and the Preboreal and Boreal, when photosynthetic activity of phytoplankton and macrophytes was the most intensive. Differences in [delta^18]O and [delta^13]C values between mollusc shells and ostracod carapaces reflect the specific season and subhabitat of each carbonate secretion.

4

Wytapianie się pogrzebanych brył martwego lodu w późnym glacjale i wczesnym holocenie a zdarzenia ekstremalne

Błaszkiewicz M.

Landform Analysis

|

2008

|

Vol. 8

9--12

5

Terrestrial deposits from the Słupsk bank as an evidence of the late glacial and early holocene Baltic sea level

Uścinowicz Sz., Zachowicz J.

Polish Geological Institute Special Papers

|

2005

|

Vol. 16

133--141

EN

The site of Late Glacial and Early Holocene peat and limnic sediments at eastern part of Słupsk Bank were investigated by seismoacoustic profiling, lithological, pollen and molluscs analyses, and 14C datings of 3 sediments cores. There is an evidence that from the last deglaciation to the beginning of the Littorina transgression c. 8000-7500 years BP, the Słupsk Bank was a land area, and the maximum water level of the Baltic Ice Lake and the Ancylus Lake was lower then 24-25 m below the present sea level.

PL

Badania sejsmoakustyczne oraz analizy osadów (litologiczne, palinologiczne, malakologiczne), a zwłaszcza datowania radiowęglowe torfów, pozwoliły na szczegółową charakterystykę stanowiska późnoglacjalnych i wczesnoholoceńskich torfów i osadów jeziornych we wschodniej części Ławicy Słupskiej. Wykazano, że od deglacjacji do początków transgresji litorynowej, około 8000-7500 lat BP, Ławica Słupska była lądem, a maksymalny poziom wód w zbiornikach bałtyckiego jeziora lodowego i jeziora ancylusowego nie był wyższy niż 24-25 m poniżej współczesnego poziomu morza.