Plaisancian

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Plaisancian

[plā′zän·chən]
(geology)
A European stage of geologic time: lower Pliocene (above Pontian of Miocene, below Astian). Also known as Piacention; Plaisanzian.
References in periodicals archive ?
What the geological registry shows is that, where present, Pliocene sediments of Piacenzian age (3.
Taking the elevation and estimated age of beach sediments and/or correlative abrasion platforms at several places (200-350 m, attributed to the Piacenzian, ~3 Ma; 70-80 m, attributed to the Lower Pleistocene, ~1 Ma; 35-40 m, attributed to MIS 7, ~200-250 ka; and 20-25 m, attributed to MIS 5e, ~125 ka), relatively constant, long to shorter term average uplift rates of 0.
de' Mussi's account is probably secondhand and is uncorroborated; however, he seems, in general, to be a reliable source, and as a Piacenzian he would have had access to eye-witnesses of the siege.