Vesuvius, stately yet brooding, as seen from Pompeii. The 79AD pyroclastic flow must have been quite something, looking at that distance!

Also, isn't the pine on the left wonderfully stately?

#geology #volcanology #volcanoes #vesuvius #vesuvio #vesuvio #pompeii #PompeiiArchaeologicalPark #pyroclastic #pinetree #trees

A range of #Oregon #volcanic #soils developed over fragmental #pyroclastic #rocks and #tuff.

All are well drained soils that show little compaction or development of #clay…though some are used extensively for local agriculture.

1) Butte Falls
2) Prospect
3) Bonanza (Hildebrand)
4) Hood River (Parkdale)

#Volcano #Cascades #Plagonite #SoilProfile

#Pyroclastic #SurgeDeposits of ash and other #tephra in road cut along #CraterLake Highway. These surge deposits sit atop at least 100m of ash, the tops of which are exposed in nearby #Roadcuts.

Near the flanks of former #MtMazama #volcano , the pumice filled existing valleys and created enormous water reservoirs that temper seasonal cycles to support local hydrology year round.

The contrast in #eruption style is evident between these two proximal exposures.

#Geology #Rocks #Oregon #PNW

Not often I get a chance to recreate a photo after 33 years have elapsed…but a couple years ago, I did…along the Upper #RogueRiver above Prospect, OR.

The view was better in 1984(ish) B/W when the few scant trees present on the cut-bank were saplings…but recently we’re 50’ tall or more.

What always impressed me was the immensity of the #pyroclastic flows that created the exposure, likely filling a paleo valley to a few hundred feet depth.

#volcano #pumice #caldera #geomorphology #geology #Oregon #PNW #Rivers #photography

#Geology #Tuff #Volcano #Hydrovolcanism #Palagonite
#EruptionStyle #TuffCone #Rocks #Pyroclastic #Geoscience

Eastern Klamath County, #Oregon volcanic eruption that transitions from explosive hydrovolcanism to classic cinder cone eruptive styles as rising magma initially encounters groundwater and/or shallow surface water, then either seals itself from those waters as eruption proceeds, or the water was consumed by the eruption.