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There are facts, that Pompeii was lost on December, 16th, 1631.On the Via Nazionale road from Naples to Reggio/Calabria, at 15 km, a so-called "Epitaphio" on the face of the Villa Faraone Mennella today presents two memorial inscriptions in Latin on a monumental volcanic stone.It is translation from latin."This road from Naples to Reggio [i.e. the Royal City], infamous for continuous robberies [raids] and difficult transit on account of the arid stones of Mount Vesuvius, has been freed from ambush, levelled, straightened and broadened, by means of the funds given by the Province.
Later 68 years in 17 Calend. (on December, 16th) January in Phillip's reign IV.
Smoke, flame, roaring, shaking, ashes, eruption awfully wild at that time Vesuvius has obviously caused fear in one, and at weight of people. The heated heat from an aperture of the fiery cave, violently loudly roaring, has opened the way through constraining surface to an output, has moved to Hellespont, has furiously destroyed top of mountain, monstrously suddenly widely having opened a pharynx of mountain, next day a tail of ashes was dragged all filling similarly to the sea hostile to the sea. The river of the sulfur, burning bitumen, fetid stones, the various deformed metal ores, a mix of water and fire, moving an avalanche, a smoke, ashes, disastrous sewage have unloaded a ridge of mountain.Pompeii, Herculaneum, Octavianum, partially Retina and Portici, woods and country houses, and houses has in a flash scattered, has burnt, has destroyed, (stream) bearing all this before itself, as extraction in mad devastating triumph. Marble monuments have disappeared actually also, are deeply buried, the inquiring monument of Vice-king has really been destroyed. Emmanuel Fonseca and Zunica.
As memory of the sizes of human disaster, as well about the accepted measures on clearing of a stone rain and rescue completely each of our fellow tribesmen. Year of Redemption 1634. Prefect of road of Antonio Suares Messia." Just a moment...Edited by elcano, : No reason given.

see PAGE NOT FOUND | Loyola University Chicago LibrariesIn this work Neapolitan Jesuit G. B. Mascolo records his observations of the eruption of Mount Vesuvio in 1631. The illustrations record the appearance of the volcano and the surrounding area before and after the eruption.On a map there is Pompeii and Herculaneum (1631 Year )Edited by elcano, : No reason given.

Any medieval subject to Pompeii it is not found. Above this city only one layer of the ground from eruption Vesuvius. (7-10 meters, either 79 year, or 1631)

Pliny the Younger in the book of 6 letters 16 and 20 describes eruption of Vesuvius. However it does not result date of eruption. Pliny the Younger in general anywhere does not mention Pompeii, it does not know such city.
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Eruptions of Vesuvius was much. Archeologists have found to Pompeii a volcanic layer only from one eruption which they dated 79 year. To Pompeii it has not been found any traces from other eruptions.

A Plinian eruption ejects a column of tephra high into the atmoshpere (tephra refers to any material that is ejected from a volcano into the atmosphere), creating a form similar to the mushroom cloud of a nuclear explosion. A Plinian eruption of Vesuvius began at midday on 24 August 79 AD created a Plinian column approximately 20 km (66,000 feet) high. This phase created a rain of ash and pumice over a broad area primarily to the south of Vesuvius, carried by prevailing winds. This phase lasted approximately eighteen hours, when approximately 2.5 meters (8.2 feet) of pumice stones fell on Pompeii, an initial layer of 1.3 to 1.4 meters (4.3 to 4.6 feet) of white pumice, followed by 1.1 to 1.3 meters (3.6 to 4.3 feet) of denser gray pumice. The average diameter of the pumice fallout was 1 cm (0.4 in), and posed little direct threat to human life.http://urban.arch.virginia.edu/struct/pompeii/volcanic.htmlOnly such layers and only from eruption 79 years.

P.R. Renne assumes :
“We sought to investigate the limits of the 40Ar/39Ar method by application to ejecta from the infamous eruption of Vesuvius? Which destroyed Pompeii and other Roman cities, AS DOCUMENTED IN THE WRITINGS OF PLINY THE Yanger”
http://hbar.phys.msu.ru/gorm/dating/vesuvius.pdf
The given assumption false.
Pliny Younger does not know year of eruption of Vesuvius and does not know the city of Pompeii.

I do not speak, that there is a layer only from eruption 79 years, It archeologists speak all, that me extremely surprises. And on a monument costing in Torre del Greco it is written Pompeii and Herculaneum were lost on December, 16th, 1631. What are possible conclusions?

Yes you correctly speak. Pliny the Younger and Martialis know about eruption of Vesuvius but in what to year it has occured they to us do not inform.
They do not know the city of Pompeii and Herculaneum.
Only Dio Cassius (Xiphilinus is the author of 11 centuries) knows about destructions of Herculaneum and Pompeii.
The first edition of the book Xiphilinus was in 1551.
There are no other ancient authors knowing about destruction Pompeii and Herculaneum, only Xiphilin.

well