Paris and river dating
Occasionally the summer level is considerably reduced (such as in the summers of 19), but the sandbanks that are so typical of the Loire do not appear.Low water is further masked by the regularization of the river that has been carried out to improve its navigability.
The broad estuary opens rapidly and extends for 16 miles below Tancarville to Le Havre; it experiences the phenomenon of the tidal bore, which is known as the From its source to Paris, the Seine traverses concentric belts of successively younger sedimentary rocks, infilling a structural basin, the centre of which is occupied by the limestone platforms of the Île-de-France immediately surrounding Paris.Joined by the Aube near Romilly, the river bears west to skirt the Île-de-France in a wide valley to Montereau, where it receives the Morvan, a northward extension of the Massif Central.Turning northwest again, the Seine passes Melun and Corbeil as its trenched valley crosses the Île-de-France toward Paris.Upstream from the basin four large storage reservoirs have been built since 1950 on the Yonne, Marne, and Aube, as well as on the Seine itself.These relatively shallow impoundments (averaging about 25 feet in depth) cover large areas.The English Channel breaches the symmetry of the basin on its northern side, interrupting the completeness of the concentric zones. The basin of the Seine presents no striking relief contrasts.
Within 30 miles of its source the river is already below 800 feet, and at Paris, 227 miles from its mouth, it is only 80 feet above sea level.
The rocks of this basin are inclined gently toward Paris at the centre and present a series of outward-facing limestone (including chalk) escarpments ( are breached by the Seine and its tributaries, which have made prominent gaps.
As they converge upon Paris, the trenchlike river valleys separate a number of islandlike limestone platforms covered with fertile, easily worked windblown soil ().
Since the early Middle Ages it has been above all the river of The Seine rises at 1,545 feet (471 metres) above sea level on the Mont Tasselot in the Côte d’Or region of Burgundy but is still only a small stream when it traverses porous limestone country beyond Châtillon.
Flowing northwest from Burgundy, it enters Champagne above Troyes and traverses the dry chalk plateau of Champagne in a well-defined trench.
Precipitation throughout the basin is modest, generally 25 to 30 inches (650 to 750 millimetres), and is evenly distributed over the year as rain, with snow infrequent except on the higher southern and eastern margins.