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==Structure==
The Paris Basin is a [[Geology|geological]] [[Sedimentary basin|basin]] of [[sedimentary rock]]s. It overlies geological [[Stratum|strata]] disturbed by the Variscan orogeny and forms a broad shallow bowl in which successive marine deposits from throughout periods from the [[Triassic]] to the [[Pliocene]] were laid down, their extent generally diminishing with time. Based on analysis of [[fossil]]s recognized in the Paris Basin strata during the 1820s and 1830s, the pioneering geologist [[Charles Lyell]] divided the [[Tertiary]] into three ages he named the Pliocene, the [[Miocene]] and the [[Eocene]]
To the west, the strata folded by the Variscan rise from below the more recent marine deposits in the hills of [[Brittany]] and, to the east, the [[Ardennes]], [[Hunsrück]] and [[Vosges]]. To the south, it borders on the [[Massif Central]] and the [[Morvan]]. To the north, its strata link into those of the bed of the [[English Channel]] and south-eastern [[England]]. Other boundaries lie on ridges in more recent deposits and scarps such as the [[Côte d'Or (escarpment)|Côte d'Or]] (on an [[Alpine orogeny|Alpine]] [[Geological fault|fault line]]) and the Hills of [[Artois]] which overlie the margin of [[London-Brabant Massif]].
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