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Pete Bowden

@peterlbowden1.bsky.social

Mylonites, migmatites & metamorphism. With some pseudotachylite thrown in for light relief.

175 Posts388 Follower158 Folgt
Kim Cobb@kimcobb.bsky.social · 8mo ago

It is hard to overstate how critical @ncar-ucar.bsky.social is to climate science in the US and around the world. It's the beating heart of our field. Generations of scientists have trained there, and almost everyone I know relies on deep collaborations with NCAR scientists. It's end is unthinkable.

USA TODAY@usatoday.com · 8mo ago

Exclusive: The Trump administration is moving to dismantle the National Center for Atmospheric Research in Colorado, according to a senior White House official, taking aim at one of the world's leading climate research labs.

The Megalithic Portal Ancient Sites & Stones@megalithic.bsky.social · 9mo ago

🏆Win🏆the perfect Christmas 🎄 gift for a stones enthusiast: STONE LANDS (on the Waterstones and Telegraph Best Books of 2025 lists) AND ALSO THE OLD STONES (The Megalithic Portal guide, winner of Current Archaeology Book of the Year) To win a signed (and dedicated if you like) copy of both books… 1/

Win a copy of STONE LANDS (on the Waterstones and Telegraph Best Books of 2025 lists) AND ALSO THE OLD STONES (The Megalithic Portal guide, winner of Current Archaeology Book of the Year)
Dr. Wendy Bohon@drwendyrocks.bsky.social · last yr.

I’m working hard to find glimmers (micromoments of joy, peace, and happiness) and I wanted to share one of today’s glimmers. Here is a river otter sunning himself on the banks of the American River.

Pete Bowden@peterlbowden1.bsky.social · 2y ago

A beautiful example of an Outer Hebrides dyke cutting the foliation in Archaean #Lewisian gneiss. Although folded by later Laxfordian deformation both the dyke and a thin apophysis exhibit near perpendicular angular discordance in the fold hinge, becoming concordant in the limbs. Isle of Harris. ⚒️🧪

A black Outer Hebrides dyke cuts across the pre-existing foliation in grey Archaean Lewisian gneiss. Thin apophysis (offshoot) and the hinge zone of the folded dyke exhibit near perpendicular angular discordance to the foliation. These rocks were folded during Laxfordian deformation and strong flattening in the limbs of the folds brought the contact of the dyke and the foliation into concordance. This outcrop is located west of the village of Rhenigidale, Isle of Harris, Outer Hebrides.
Pete Bowden@peterlbowden1.bsky.social · 2y ago

A #FridayFold fresh from today's first field excursion of the new year. The black Outer Hebrides Basic dyke was intruded into the paler grey Archean Lewisian gneiss prior to Laxfordian deformation which produced the tight recumbent fold. Near Rèinigeadal, (Rhenigidale), N. Harris, Outer Hebrides.

Black Outer Hebrides Basic dykes were intruded into the paler grey Archean Lewisian gneiss prior to Laxfordian deformation. At this location the deformation produced tight recumbent folds especially in the darker rocks. Approximately 0.5km south west of the village of Rèinigeadal, (Rhenigidale), N. Harris, Outer Hebrides.
Pete Bowden@peterlbowden1.bsky.social · 2y ago

Interesting barometer reading this morning as storm Éowyn passes by😵. Adjusting for elevation of 67m this is equivalent to approx. 948hPa at sea level. I think I might set it to show sea level equivalent in the future.

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Pete Bowden@peterlbowden1.bsky.social · 2y ago

The volcanic features on the Fife coast include this fine example of a basalt dyke intruded into volcanic tuff. The en-echelon disposition is picked out by the lichen which favours the basalt dyke. ⚒️🧪

A dark grey basalt dyke is covered in pale greenish grey lichen with occasional patches of yellow lichen . The dyke cuts through green unbedded volcanic tuff containing fragments up to 25cm in diameter. The dyke exhibits an "en-echelon" arrangement where it pinches out and then continues with a slight offset. Scale is 150cm walking pole (to left of dyke). This location is very close to the coastal path below St Monans church.
Pete Bowden@peterlbowden1.bsky.social · 2y ago

Occasionally I (re)visit rocks that are not Pre-Cambrian. As a student in Dundee I was often taken on field trips to the Fife coast to see the wide range of sedimentary and volcanic rocks. These Carboniferous cross bedded sandstones are found near St Monans, south of St Andrews. ⚒️🧪 #Geolgy

Pale buff coloured sandstones of Lower Carboniferous age show repeated units of cross-bedding, (scale given by 10cm red & white compass clinometer in centre).