In another valley in the forest, near the sources of the Hermitiere, however mr. Gouchet found an oak of even 50 m tall.
At the sign near the Emery Oak a height of 47.75 m is reported, measured in 2007.
Myself I measured at 28 and 29 April 2012 an average of 47.4 m (range 47.0 - 47.8 m) for the two highest tops, 2.9 m taller than our tallest laser measurement till then for Quercus petraea. Sisley measured 48.10 m in December 2012, when the tree was totally without leaves. In the Hermitiere valley I found one taller sessile oak of 48.4 m. These are the tallest oaks in Europe measured with laser. For other forests in France, heights to 45 m are reported, in Germany to 44 m.
The Chêne Emery is marked on the topographic maps and easy to find along a forest road to the Fountaine de la Coudre. The extreme height is due to the sheltered location of the valley, the fertile, deep loamy soil and the constant water supply. The climate with relatively mild winters and moderately warm, rainy summers will be sufficiently favorable. It is notable here that the oaks are taller than the surrounding beeches. Several other oaks in the same valley reach heights of 40 to 44 meters. The tallest beech I measured in this valley was 41.4 m.
The girth of the tree is 3.41 m measured at a height of 1.30 m (Apr 28, 2012, Jeroen Philippona). Its height is exactly 48.10 m (Dec 4, 2012, laser with Sine method (e.g. Nikon Forestry 550 laser rangefinder), Sisley). This tree was planted around the year 1742 ± 10, which makes it around 271 ± 10 years old (Jeroen Philippona, May 1, 2012).