Infobox River | river_name = Armançon
caption = The Armançon in Semur-en-Auxois
mouth = Yonne
length = 202 km
elevation = ± 380 m
discharge = 30 m³/s
watershed = 2,990 km²The
RiverArmançon drains part of north-western Burgundy in France. It rises in the "département" of Côte-d'Orand flows into the River Yonne (right bank) at Migennes. It rises at an altitude of about 380 metres and enters the River Yonne, 202 km downstream, at 79 metres.
The river's course downstream
It rises two kilometres north-west of
Meilly-sur-Rouvresin the district known as the Auxois, on the lip of the saucer represented by the Paris basin. It flows down the western, dip slope of the Côte d'Or and on the margin of the Morvan. Its source is on the Lower Jurassicrocks where they and the Upper Triassicare much influenced by the granites and volcanismof the Morvan, a northward extension of the Massif Central.
The river's upper valley is used by the Canal de Bourgogne and the "Autoroute" A6 but the two diverge and the river passes between them, alone towards the small town of
Semur-en-Auxois. In this part of its course the river has cut its valley down through the Jurassic rocks to the underlying granite. The Cernant joins just below Semur.
Near Buffon, north-west of
Montbard, the canal joins it again from the Brenne valley accompanied by the Dijonto Paris(" Gare de l'Est") railway. The Bornant enters from the left slightly lower. They all pass through forested country on Middle Jurassicgeology. Shortly after, they pass into the "département" of Yonne. Near the border between the "départements" and just below Ravières, the river passes onto the Upper Jurassicwhere the valley bottom has accumulated Holocene alluvium. However, the Upper Jurassic rocks are available to supply the clay element of the materials for the cementworks which lie between the river and the canal between Pacy-sur-Armançonand Lézinnes. Still in forested country, it passes the small town of Tonnerreand passes very briefly through the "département" of Aubeas it flows onto the lower Cretaceousrocks, clothed in less woodland.
Just below Saint-Florentin it is crossed by the
TGVrailway from Paris to Lyonand Avignon. The river arrives on the Middle Cretaceousas the Créanton joins from the right, just before the river and the Canal de Bourgogne enter the River Yonne at Migennes. The town is backed by the relatively treeless Upper Cretaceouschalk.
Lower Cretaceousis comparable with the rocks of the Wealdof southern England and the Upper Jurassic with the Oxford Clayand associated strata of the English Midlands. The middle Jurassic rocks contain more limestones. The Upper Cretaceousis mainly chalk
Its principal tributaries are:
Rû de Bierre(right bank)
Ruisseau de Bornant(left bank)
Ruisseau de Cléon(left bank)
Ruisseau de Larry(left bank)
Ruisseau de Thorey(left bank)
"Ru" is an old or literary word for "brook". "Ruisseau" is usually translated as stream. It can mean "gutter".
* [http://fr.wikipedia.org/wiki/Arman%C3%A7on French Wikipedia]
*"Michelin France Tourist and Motoring Atlas 1:200 000e" (2002)
*Dercourt, J. "et al". "Carte Géologique de la France à l'Échelle du Millionième" (2003)
* [http://sandre.eaufrance.fr/app/chainage/courdo/htm/F3--0210.php?cg=F3--0210 The Armançon at the Sandre database]
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