Not quite. Some might describe the eruption in that way (I think Kent Hovind has in the past), but it is important to look at the specific layers that were deposited and their traits.
Some might think this sounds silly, but there are many different types of rocks. And many different types of sedimentary deposits and depositional features.
https://pubs.usgs.gov/bul/1859/report.pdf
Above is an article about Mt. St. Helens and within the pdf, on page 18, there is discussion of layers it has made. Of them, breccia (rock composed of angled and fragmented rock usually formed by high energy motion, common with volcanoes), lahar (pyroclastic mudflows, common of volcanoes), layers of ash (self explanatory).
These are layers that you would expect to come from a volcano.
But in the earth, in post 245 as well, this is not always the case. And what I described are of rock types that are much different than those of Mt. St. Helens.
And even of those layers, they were not all produced in an individual eruption. Im just breezing through this document and it looks as though only the very top layer (5 ft) was produced in the recent eruption.