Lateglacial and early Holocene vegetation ... - geo.edu.ro

L. Bj .orkman et al. / Quaternary Science Reviews 21 (2002) 1039–1059 1051
Table 3 (continued)
Zone
Depth
(m)
Age
(cal. years BP)
Description
Inferred local upl<strong>and</strong>
<strong>vegetation</strong>
Correlation with
Steregoiu
P12, Corylus–
Ulmus LPAZ
4.98–4.01 9300–c. 8100 Very high pollen percentages for
Corylus (40–65%), fairly high
percentages for Ulmus (10–15%),
Fraxinus (has a peak value above
15%), Picea <strong>and</strong> Cyperaceae (only
in the topmost samples), <strong>and</strong> low,
but significant values for Alnus,
Quercus, Tilia <strong>and</strong> Poaceae undiff.
o40 mm. Pinus <strong>and</strong> Artemisia have
significant occurrences. Presence of
single or scattered pollen grains of
Betula, Acer, Carpinus-type, Fagus,
Viscum, Hedera helix <strong>and</strong> Salix.
Compared to the preceding zone,
Corylus has increased, while
Betula, Pinus, Ulmus, Tilia <strong>and</strong>
Poaceae undiff. o40 mmhave
decreased
Dense forest dominated by
Corylus <strong>and</strong> Ulmus, but
Picea, Quercus, Tilia <strong>and</strong>
Fraxinus were also
common. Local presence of
Acer, Hedera helix <strong>and</strong>
Viscum
S11
Table 4
Summary of the pollen stratigraphy, chronology <strong>and</strong> <strong>vegetation</strong> history for Steregoiu (see Fig. 5 for pollen diagram). A correlation with the pollen
zonation for Preluca Tiganului is also given
Zone
Depth
(m)
Age
(cal. years BP)
Description
Inferred local upl<strong>and</strong>
<strong>vegetation</strong>
Correlation with
Preluca
Tiganului
S1,
Pinus–
Poaceae–
Artemisia
LPAZ
S2, Pinus–
Poaceae–
Betula
LPAZ
5.92–5.43 >14,700 High pollen percentages for Pinus
(40–55%), fairly high percentages
for Poaceae undiff. o40 mm
(10–20%), Artemisia (5–15%) <strong>and</strong>
Cyperaceae (5–10%), <strong>and</strong> low, but
significant values for Betula
(c. 5%), Juniperus (3–5%) <strong>and</strong>
Chenopodiaceae (c. 3%). Salix
has a significant occurrence. Low
total pollen concentration (above
50,000 grains/cm 3 only in a few
samples)
5.43–5.32 c. 14,700–14,150 Very high pollen percentages for
Pinus (60–70%), fairly high
percentages for Betula <strong>and</strong> Poaceae
undiff. o40 mm, <strong>and</strong> low, but
significant values for Cyperaceae
<strong>and</strong> Artemisia. Alnus, Salix <strong>and</strong>
Juniperus have significant
occurrences. Compared to the
preceding zone, Betula, Pinus <strong>and</strong>
Alnus have increased, while Salix,
Juniperus, Poaceae undiff. o40 mm,
Cyperaceae, Artemisia <strong>and</strong>
Chenopodiaceae have decreased.
The total pollen concentration has
increased to values above 100,000
grains/cm 3
Open <strong>vegetation</strong>, most likely a
mosaic with low shrubs, grass,
sedges <strong>and</strong> herbs
Open <strong>vegetation</strong> with scattered
Pinus <strong>and</strong> Betula individuals
?
P1–P3?