Coëvrons

To the north of Évron in the department of the Mayenne, extends a regular chain from hills, the chain of Coëvrons , depend on the Armorican Massif, which, directed the North-East in south-west, separates the areas from Laval and Mayenne. Its culminating point, the Mont Rochard, between Evron and Bais, reached 357 Mr. C' is of this chain that Paris partly drew the porphyry from its Pavé S.

History

  • the Coëvrons term is known as of the Middle Ages, in various forms: Capella Sanctæ Trinitatis de Couevron (Files of the the Sarthe), Montem Crebuon , 989 (Cartulaire of Évron), Sylva de Coesvrons , 1219 (Cartulaire of Évron), In memore of Coivronio , 1222 (Cartulaire de Champagne), Couevrons 1327 (Louis-Julien Morin of Beauluère), moors of Couevrons 1672 (Consent of Sillé), mountains of Couesvrons , 1706 (Hubert Jaillot).
  • Beyond the range of hills, definitely circumscribed, which extends from the signal of Montreuil-the-Weak Voutré with , the term Coëvrons indicates also today more generally the area of Évron. Thus SVET of Coëvrons (trade union intercantonal with economic and tourist vocation) is competent on the cantons of Bais, of Évron, Montsûrs and Holy-Suzanne.

Geography

The chain is limited, in north as in the south, by two old valleys, deep, dug by two disappeared rivers of which the primitive site more is represented only by sections of various brooks: such are in the north of the chain, the brook of Defais , between Cordé and Quincampoix (the Sarthe); the Orthe, between the wood of Fontelais and Saint-Pierre ; the Erve, since Vimarcé until Ace; finally in the south, the brooks of Voutré and of Vègre , which are on the prolongation one of the other but which runs in opposite direction and are separate at their point of origin only by one threshold of no importance. The direction of this last valley is easy to follow until Sillé where one finds it very clear between this city and the ridges of Oigny , and also even more in the east; it was used besides for the layout of the railroad of Laval to the Mans, which benefits from this depression to leave the Armorican Massif and to emerge in the oolitic plain of Conlie ( Champagne ). The bottom of the two valleys being used as northern and southern limit in Coëvrons, is on a much lower level compared to the top of the chain; the difference in altitude varies between 130 m and 170 Mr.
  • These valleys are dominated on the side opposed to the chain by heights forming around this one a kind of continuous belt. It is: the peak of Twisted (169 m), that of Mount-Saint-Jean (191, 243 m); the wood of Querray (219 m); the Saint-Martin-of-Cone continuation of hills going of to the wood of Crun , and on the course of which are the mount Rottu (299 m) and the mount of Fire (297 m). Starting from the wood of Crun (285 m), the peak returns abruptly towards the south to form the rocks of the Influenza and the rock of Hell , which rise in the east above the hollow of the Galinières and Assé-le-Bérenger, and where one has a very beautiful sight of the final croup of Coëvrons, which exceeds of 169 m the level of the valley of the Erve.
  • Starting from the influenza the tops attenuate, but one still however follows the trace of the hills thanks to the heights of the Rondins (169 m) and of Peutiballe (210 m).
  • After having passed the Erve with Crousille , one finds the chain, characterized better, with the hillock of Clougautier (190 m) and of Hucheloup (210 m); with those which dominate in the south the borough of Rouessé-Vase; and further still, after having crossed the cut of Vègre , with the hillock of Oligny .

Geology

The geological constitution of Coëvrons explains some clearly modelled.
  • the chain is consisted a Synclinal whose bases, in the shape of ridge tiles, regularly encase the ones in the others; they increase of number while advancing towards the North-East, and their sides deviate to make it possible the more recent layers to take seat there. Thus one meets there, on the basis of the Rock-with hell , in Assé-le-Bérenger, and going to the Tuileries (southern of Montreuil-the-Weak), the most complete succession which exists in the Armorican Massif series Cambrien, Ordovicien and gothlandienne .
  • the chain of Coëvrons is made up in major part by sandstone, petro Silex , breaches of porphyrites and Poudingue S with rollers of porphyry indicating a contemporary volcanic activity of these deposits; finally by quartz ophyllades . These rocks, thanks to resistance which they opposed to the erosion, remained projecting, while the Schiste S and the Calcaire S which surround them could be easily started (those, indeed, coinciding with the valleys which limit this chain to north and the south). Lastly, the series of hills which encloses the whole corresponds to a band of purple Poudingue (Cambrien bases) which, in consequence of the cohesion of its elements, part of its primitive relief preserved.
  • two sides from synclinal from Coëvrons being dissymmetrical (from the point of view thickness of the sitted ones which constitutes it), and that of the south being less sandy than that of north, it is resulted from it an inequality in dismantling from the two slopes, involving like consequence a difference in the degree of slope of each one of them: that of north being more abrupt than that of the south. However, this character disappears towards the east, the southern side there being consolidated by the Armorican sandstone of Hôpiteau and the wood of Pezé .
  • the culminating part of the chain is occupied by rocks of various natures; thus the signal of Voutré and of the sources (292 m) is consisted sandstone; that the highest point of the chain ( Pierre-of-seven-churches ) is in breach petro Silice uses; then that the sandstone reappears again in the wood of Courtaliéru and in all the northern part of the forest of Sillé .
  • a feature particular to this chain, it is to be accompanied in north, on the side of the valleys of the Erve and the Orthe, by a series of monticules rounded, which sometimes are coupled with the chain in the form of buttresses ( Monturbeau 245 m, Montafilou 223 m, Cerclerie 299 m, the wood of Orthe 242 m); sometimes rise in small hillocks in the middle of the valley, as one sees it between Assé and Foulletorte, with the Tertre (Vimarcé), with Courtaliéru (176 m), between Vimarcé and Saint-Pierre, or more in the east towards Boissière. These hillocks are the result of secondary folds in the Schiste S zones cambriens and the Calcaire S of the same age which accompany them; the layers, little raised and very corrugated, constitute a series of small domes become incomplete in consequence of the ablation of one their sides, but of which the initial structure is still definitely indicated.

Careers

  • the sandstones of the Sources and Courtaliéru were exploited by the Société of the careers of the West like paving stones, mainly for the streets of Paris, then this exploitation was off-set in the Charnie close to Torcé-Fish pond-in-Charnie ( Hillock-White , Large-Fouteau ) and with Holy-Suzanne ( the Pont-neuf ); this last career was unused in 1939, where it occupied 30 more to 40 workmen carriers.
  • “Kabylie” .
On the southern slope of Coëvrons, to Voutré, the place says Kabylie , is exploited an important career connected to the road and the railway Laval - Mans. One exploits a porphyrite and felsite breach there, which was used for manufacture of the Macadam or to constitute the ballast of the ways of railroad; the small glares coming from the breaking of the stone were formerly used for épandre on the surface of the wood paving stones. This career, supplemented by that of Massotrie currently exploited, provides today excellent materials for the construction and the repair of the roads and highways, as well as railways of RF (Rail network of France).

  • Cauldrons of Maine, Exit of the 4/25/2004 in Normandy and Maine animated by Jean Gall, University of Caen.

Fauna

See also: Pond of the Ford-of-saddle

  • Roe-deers, wild boars.

Rivers

Forests

See too

  • Web site of Coëvrons
  • Country of Art and History Coëvrons-Mayenne
  • Montaigu
  • Mount Rochard
  • Hillock Ganne

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