Sentences with word «macrofossil»

«These include the sharp mud - over-peat contacts that are laterally continuous over 5 kilometers, changes in fossil foraminifera assemblages across the buried peat contacts, long - lasting submergence also derived from fossil foraminifera records, and radiocarbon ages of plant macrofossils taken from buried peat deposits that are consistent with other southern Cascadia earthquake chronologies derived from buried peat and tsunami deposits.»

(iv) Sites with charcoal macrofossils beneath, in, and above the current organic horizon (corresponding to the large majority of the remaining sites of the study area) are treeless stands composed of a much scattered cover (generally < 1 %) of black spruce shrubs — i.e. sites burned probably more than twice since initial forest establishment, without successful tree regeneration and currently forming lichen - shrub tundra.

(i) Fire - free sites are those sites without charcoal macrofossils beneath, in, and on the current organic horizon (corresponding to 10 % of the surface of the study area) and with stands composed of a dense cover (generally > 40 %) of black spruce trees and shrubs — i.e. sites free of fire disturbance during a long period, but of unknown duration, of the Holocene.

Late Tertiary plant macrofossils from localities in Arctic / Subarctic North America: A review of data

Overall, the drastic reduction of the forest cover was followed by a lowering of approximately 30 m of the regional forest line — the difference between maximum position in altitude of krummholz and woodland — and approximately 50 m of the regional tree line (i.e. the difference between maximum altitude of spruce macrofossils in tundra sites and position of the current tree line).

We assume that the presence of chile is in the form of a sauce or paste, and not whole given that no seeds or other macrofossils were identified in the interiors of the vessels.»

Radiocarbon ages of plant macrofossils at the top of the buried peats are 195, 1280, and 1710 years old.

Non-pyritized macrofossils showing two distinct morphotypes present on the same stratigraphic level, with part and counterpart.

From these cores we analyze pollen, spores, and plant and animal macrofossils.

Kneller, M., and D. Peteet, 1999: Late - glacial to early Holocene climate changes from a central Appalachian pollen and macrofossil record.

(iii) Sites with charcoal macrofossils beneath the current organic horizon (corresponding to more than 20 % of the sites of the study area) are stands composed of a relatively dense cover (generally between 10 and 40 %) of black spruce trees and shrubs — i.e. sites burned probably more than twice since initial forest establishment with successful tree regeneration because they are currently forming woodlands and krummholz.

AMS 14C dating of plant macrofossils, beetles and pollen preparations from two.

Taking sediment cores and analyzing the peat, we count pollen grains, plant macrofossils and charcoal — all of which document the dramatic and abrupt shifts in the Hudson Valley's regional climate such as the Medieval Warming drought that occurred between 800-1350 AD.

Wildfire history and fire ecology of the Swiss National Park (Central Alps): new evidence from charcoal, pollen and plant macrofossils

During the warm Bølling - Allerød (BA) interstadial (a warmer time period) about 15,000 to 13,000 years ago, the climate was temperate and mesic, as evidenced by the appearance of pollen of temperate deciduous oak (Quercus spp.) and pollen and macrofossils of the moisture - loving balsam fir (Abies balsamea).

Row (A) Calibrated radiocarbon dates with error bars; (B) macrofossil charcoal, an indication of local fires; (C — E) BC, char, and soot MARs; (F) char / soot ratio, an indicator of the relative contribution of smoldering and flaming combustion; (G — I) pollen percentages, proxies for paleoecological variation.

Variations in climate can be determined by the analysis of biological data like annual tree rings, fossilized pollen and other plant macrofossils, the abundance and distribution of insects and other organisms, and the biota in lake sediments.

Patterns and rates of plant migration are documented using our macrofossil studies in combination with pollen stratigraphy.