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Yvonne Strahovski (27)
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Biography
Gender:
Female
Age:
27
Ethnicity:
Asian
Nationality:
Gray
Hair color:
Black
Hair Length:
Medium
Eye color:
Blue
Height:
163 cm
Weight:
80 kg
Sexual Orientation:
Heterosexual
Services Offered For:
Men
Women
Dress size:
XS
Shoe size:
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Cup size:
B
Breast:
Natural
Pubic hair:
Shaved mostly
Tattoo:
No
Piercings:
Yes
Smoking:
Yes
Drinking:
Yes
Languages:
English
French
German
Italian
Spanish
Chinese
Japanese
Available for:
Incall: Club/Studio
Outcall: pre-bookings only! no short notice available!
Services

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About me

California tree ring dating redwood

Dendrochronology or tree-ring dating is the scientific method of dating tree rings also called growth rings to the exact year they were formed. As well as dating them this can give data for dendroclimatology , the study of climate and atmospheric conditions during different periods in history from wood. Dendrochronology is useful for determining the precise age of samples, especially those that are too recent for radiocarbon dating , which always produces a range rather than an exact date, to be very accurate. However, for a precise date of the death of the tree a full sample to the edge is needed, which most trimmed timber will not provide. It also gives data on the timing of events and rates of change in the environment most prominently climate and also in wood found in archaeology or works of art and architecture, such as old panel paintings. It is also used as a check in radiocarbon dating to calibrate radiocarbon ages. New growth in trees occurs in a layer of cells near the bark. A tree's growth rate changes in a predictable pattern throughout the year in response to seasonal climate changes, resulting in visible growth rings. Each ring marks a complete cycle of seasons , or one year, in the tree's life. The Greek botanist Theophrastus c.

The core sample from the oldest coast redwood tree ever found is a thin rod of wood the width of a pencil, a couple feet long, and densely scored at irregular intervals by dark brown stripes. In this compact package, exposed to the air and sitting on a table in front of me at the Humboldt State University Institute for Redwood Ecology, lies 1, years of history from a tree dating back to CE. Dendrochronologist Allyson Carroll hand-counted each of the 1, minuscule rings in this core. And not just this sample, but hundreds more; in all, Carroll has counted more than a quarter of a million coast redwood tree rings.

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Dendrochronology is the formal term for tree-ring dating, the science that uses the growth rings of trees as a detailed record of climatic change in a region, as well as a way to approximate the date of construction for wooden objects of many types. As archaeological dating techniques go, dendrochronology is extremely precise: if the growth rings in a wooden object are preserved and can be tied into an existing chronology, researchers can determine the precise calendar year—and often season—the tree was cut down to make it. Radiocarbon dates which have been calibrated by comparison to dendrochronological records are designated by abbreviations such as cal BP, or calibrated years before the present. Tree-ring dating works because a tree grows larger—not just height but gains girth—in measurable rings each year in its lifetime. The rings are the cambium layer, a ring of cells that lies between the wood and bark and from which new bark and wood cells originate; each year a new cambium is created leaving the previous one in place.

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Drought frequency in central California since 101 B.C. recorded in giant sequoia tree rings

Recent studies of tree rings in Europe and the United States have given scientists astonishingly precise new gauges for reconstructing the history of volcanoes, climate and human endeavor in the last 8, years. Tree rings, as distinctively patterned by fluctuations in the environment as bullets are by gun barrels, were recognized half a century ago as potentially useful historical markers. In , Dr. Andrew Ellicott Douglas of the University of Arizona established the science of tree-ring dating, dendrochronology, when he used the rings discernible in ancient wooden artifacts to determine the age of a prehistoric Indian site.

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