Callan Bentley

Alan Pitts talks about Italian seismogenic normal faults in front of the oblique slip Corona Heights MEGASLICKENSIDE

Yep, the very very best

Yes

A very, very, very very very very very very very very very, very polished fault surface reflects the blue sky

The insane, mirror-like shine of the Corona Heights Fault. ⚒️

Marshall's Beach

Sorry, should have used yellow

This is the former plate boundary thrust fault.

I don't know. I only know a handful of Franciscan outcrops. Sorry!

Callan's hand on the boundary between the Marin Headlands Terrane and the Hunter's Point shear zone serpentenite mélange.

Luke puts his hands on two different terranes.

Luke puts his hands on two different terranes, annotated.

Terrane boundary contact located! ⚒️

Callan goofily points over his shoulder at the Golden Gate Bridge

Feeling okay about life this morning ⚒️

The Golden Gate Bridge from Fort Point, with Marin Headlands in the background

Ahhhhhhhhhhh ⚒️🙂

Three students examine a rock outcrop surrounded by vegetation.

Students examining a rock outcrop surrounded by vegetation

Students checking out outcrops of Alcatraz Terrane sandstone at Fort Mason. ⚒️

Two islands in a bay, one with an old prison and one with vegetation

Hint

Very close! California coast, yes, but further north...

In space. And if you look closely you will see that this is a sandstone, not a granite ⚒️

Two fingers provide a sense of scale to a.sandsrone outcrop

Where am I? ⚒️

STOP sign augmented with sticker saying TRUM P

Observed in rural central Virginia yesterday:

On 2x4s, Graphite & Gasoline: What I'd teach about climate change if I only had an hour Tue 10 Mar, 7:00 PM - 8:30 PM [EDT]: Don Haas, PRI's Director of Teacher Programming Join us as PRI participates in Worldwide Climate and Justice Education Month, a global initiative sparking real dia...

Join me Tuesday night for a reprise of my popular talk, "On 2x4s, Graphite & Gasoline: What I'd teach about climate change if I only had an hour!"
tockify.com/paleontologi...

#teachclimate, #climatecommunication

Party sample annotated to "pop"

Accentuated version:
⚒️

A drawer full of ~3" long samples in low flat cardboard boxes. Sitting atop its box, and overlapping several others, is a slab of kinked, foliated rock.

A #FridayFold I found in a drawer full of archived samples at the state geological survey. ⚒️

Wow, this is the first time I've ever listened to this person speak. He sucks.

Always the epistemologist, that guy.

Hermit thrush on a branch

American robin on the ground. White feathers around the eye????

Turkey vulture overhead. Black feathers, itty bitty flaming red head, white beak with a black hook

Pretty common birds this time of year: Hermit thrush, American robin, Turkey vulture.
But it was nice to spend a couple hours birding this morning.
#birds 🦉

It doesn't help that I have my obligations split between my (clunky, work) Outlook calendar and my (personal, much better) Google calendar.

I'm finding it hard to stay on top of all the various commitments I gotten myself committed to. Make a couple of dumb errors this week just having too much stuff to keep track of. It's hard to stay on top of everything!

A tabletop covered in boxes containing all kinds of fossils.

Whiteboard sketch of the two major groups of brachiopods, highlighting soft tissue anatomy (pedicle, lophophore) that doesn't usually fossilize.

Nautiloid fossil (Bellerophon?) showing internal septa dividing up shell interior into chambers. These chambers are sometimes filled with calcite spar, sometimes with sediment, and in three cases in the middle of this view, with BOTH. The boundary between them shows the paleo-horizontal, with sediment below and spar above (geopetal "way-up" indicator). Annotation shows the "up" direction (down!).

Fossils lab!
⚒️

I was lucky to witness two astoundingly good talks today: @stellarplanet.bsky.social talked about exoplanet atmospheres for Geology Club, and @cintylee.bsky.social talked about bioacoustic monitoring of migrating birds for Bird Club!
Grateful to know these amazing scientists.
⚒️🦉

Raw photograph of a large cobble of granite containing a xenolith of foliated dark and light rock. Ruler for scale

Annotated photograph of a large cobble of granite containing a xenolith of foliated dark and light rock. Ruler for scale

Xenolith (gneissic amphibolite) that I picked up last weekend in a rounded cobble of granite. ⚒️

I loved getting a gyro and fries at Astor, on Columbia Rd. in Adams-Morgan, every time I would lead my Bedrock Geology of DC field trip. I was sad to see that they too are now gone.

Laminated pink/tan (ash??) layer in laminated black mudrock. Grading and soft sediment deformation present. Overlying dark layer contains wispy inclusions of pink material

Cutting rocks today at the state survey. ⚒️

Hite, Utah - Wikipedia

Resurrect Hite, Utah!
en.wikipedia.org/wiki/Hite,_U...