#pyroclastic

💧🌏 Greg CocksGregCocks@techhub.social
2024-07-09

Volcano-Formed Fossils Reveal Trilobites In Never-Before-Seen Detail
--
newatlas.com/biology/trilobite <-- shared technical article
--
doi.org/10.1126/science.adl454 <-- shared paper
--
[Palæontology was a ‘minor’ in my MSc (Geology) coursework, I have always had a fascination with it, and continue to follow it – and wonder…]
#geology #palæontology #paleontology #fossil #trilobite #marine #fossilrecord #Morocco #AtlasMountains #volcanic #pyroclastic #seafloor #ash #Cambrian #xray #microtomography #imaging #imagery #geochemistry #petrography #invertebrate

image - An artistic reconstruction of the volcanic eruption which produced the trilobite fossilscolourised and annotated images - Postantennal appendages, hypostome, and labrum of Protolenus (Hupeolenus) sp. (AY-TA-TB-03)Microtomographic reconstructions of the trilobites G. mauretanica and Protolenus (Hupeolenus) sp. from the lower Cambrian Tatelt Formation of Moroccophoto - high crossing, Atlas Mountains, Morocco
Sisyphus with a Hatlouisffourie@c.im
2023-03-19

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

Vesuvius rises out of the landscape in the distance,  sunlit against a pale blue sky with scattered clouds. In the foreground are a number of trees, with a particularly nice specimen of one of those flat top Pines Italy is famous for on the left.
2023-02-17

The second episode, #Volcano, was less emotional for me because it focuses more on possibilities and long-past events.

It does have footage of the #Fuego eruption in #Guatemala a few years ago and there's one part that's just terrible as we see a person be overtaken by the incredibly fast-moving #pyroclastic flow that killed up to 2,000 people.

In both episodes there's video and audio by survivors as they're living through these events and the effects are visceral.

2023-01-05

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

Road cut exposure of reddish brown silty soil in Butte Falls Oregon.  Small trowel aside freshly exposed soil.Soil profile showing abundant pumice exposed beneath thinner soil in primary root zone.  Prospect, Oregon.Outcrop of #Palagonite #tuff soil shows dark brown where moist, brownish yellow where dry. Small dry land shrubs fit the surface below outcrop which is at the fringe of a volcanic vent.

Palagonite represents violent interaction between magma and surface or ground water which quenches the magma instantaneously.  Soils developed from this material used extensively in the Bonanza, Oregon area for agriculture.Outcrop of deep soil profile developed in yellowish tan colored #tuff.  Small shovel head adjacent to freshly exposed deep compacted soil.
2022-12-23

#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

Pyroclastic surge deposits of ash and other tephra along road cut on Crater Lake Highway.  Well developed soil profile (1.5m thick) shows brown to orange coloring and extensive roots.Massive air-fall tuff (pumice) exposure on Crater Lake HighwayPanoramic view of the upper portion of a massive air-fall tuff deposit along Crater Lake Highway
2022-12-22

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

Bend in Upper Rogue River stream course and adjacent pumice exposure in eroded bank.  Color photo from 2017.Bend in Upper Rogue River stream course and adjacent pumice exposure in eroded bank.  Color photo from 2017.Bend in Upper Rogue River stream course and adjacent pumice exposure in eroded bank.  Black and white photo from 1984.Bend in Upper Rogue River stream course and adjacent pumice exposure in eroded bank.  Color photo from 2017.
2022-12-20

#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.

Outcropping of palagonite ejecta overlain by tuffCentral vent after groundwater “sealed” from erupting magmaPalagonitized ejecta from eruption in the presence of ground or shallow surface water
2022-12-05

On 4 December, at 15:19 UTC, a strong #pyroclastic flow along the Sciara del Fuoco on #Stromboli #volcano reached the sea and generated a moderate #tsunami, hopefully not causing damage (according to INGV). Tide gauge in Ginestra recorded it with a delay of only a few minutes, and crest to crest amplitude of ~60cm.

Stromboli is an Italian very active volcano from the Aeolian islands in the Tyrrhenian sea (Mediterranean). Its activity, and more particularly hazards due to the pyroclastic flows, are monitored by INGV.

INGV reported about the tsunami: ingvterremoti.com/2022/12/05/s
And about the volcanic event itself: ingvvulcani.com/2022/12/05/cos

The figure shows the sea level record at Ginestra for the 4th of December. A curve in blue shows the sea level. A peak at 15:22 with crest to crest amplitude of 60 centimeters corresponds to the tsunami induced by the nearby pyroclastic flow.
Sisyphus with a Hatlouisffourie@c.im
2022-11-23

An unusual, though decisively not photogenic pair of rocks today. Both are mostly hectorite (Na0.3(Mg,Li)3Si4O10(OH)2), an unusual lithium bearing clay that is often used in the cosmetics industry. They were soft when collected but hardened within a day. One comes from close to Barstow, CA, the other from the McDermott caldera in Northern NV. The hectorite is an alteration product of volcanic ash with a high glass content

#geology #ClayMinerals #volcanoes #pyroclastic #lithium

2019-04-10

USA Alert, Super-Planet, #Pyroclastic Flows | #S0News Apr.9.2019

#TheRealS0s

youtu.be/zrws4LQXNXo

Client Info

Server: https://mastodon.social
Version: 2025.04
Repository: https://github.com/cyevgeniy/lmst