Ripples in the Cretaceous Aguja Formation in Big Bend National Park. These formation is mostly composed of marine shales and mudstones but there are occasional sandstone layers that mark brief changes in depositional environment.

Local reporting on Balboa Park parking continues to omit the fact that, combining both directions for routes 3, 7, 120, and 215, buses stop at Balboa Park: - Weekdays: Every 1 minute and 52 seconds - Saturdays: Every 2 minutes and 18 seconds - Sundays: Every 2 minutes and 30 seconds

San Diego peeps: @ridesd.org is doing a happy hour/panel with Green Drinks on oublic transit in the area. Good opportunity to touch grass and meet people interested in urbanism and decarbonization. luma.com/9d8th3jq

Senior citizen and teenager with a skateboard taking the 30 bus on Mission Blvd (San Diego)

Immature Rufous Hummingbird @riceuniversity.bsky.social. These guys are getting ready to fly north for the summer, perhaps as far as Alaska. Before doing so, they need to replace some of their worn juvenile feathers. This one is still growing in its central tail feathers and inner primaries.

San Diego: Fashion Valley Transit Center is closed. This is the plan for the most severe Mission Valley flooding, so probably a good idea to avoid that area if you can.

I spoke with @carlzimmer.com about our terminated grant on wildfire smoke and homes:

Happy Holidays from Pacific Beach.

Indigo Bunting (Passerina cyanea): This 13cm (5in) bird is native to the Americas. It winters in a range from South America to Florida, breeding from Florida up to southern Canada. It is a seed eating species. Terrific shot of this brilliant blue bird taken by Joe Povenz in the USA. #indigobunting

Well, I tried waiting for blue skies and yellow ginkgo carpets on campus, but the Tule fog/stratus robbed me of that vision, so here’s the consolation view yesterday.

Low tide at Tourmaline Beach viewed from Bird Rock

A Western Willet flying over me. In the fall, the Eastern Willets along the coast fly south to their wintering grounds and are replaced by Western Willets returning from the north. Willets are here year round, but the two species trade places every season. And yes, they are different species.

CVS phone AI just genuinely actually said "Villa Long Acting Jolla Drive".

View from Kate Sessions Park, San Diego

After seemingly disappearing for 5 days, our Allen's Hummingbird @riceuniversity in Houston, TX has returned. Where did to go to all this time?

Oslo i solnedgangen 2025-11-15

The most #SanDiego of headlines. @abc10news.bsky.social

Another Allen’s Hummingbird @riceuniversity.bsky.social in Houston. Amazing we’ve now had two. Our garden is working!

Here in Houston @riceuniversity our soccer fields attract migrating meadowlarks in late October and early November. One might assume they are the expected Easterns but most have turned out to be Westerns. They r difficult to identify: subtle differences in face, tail and tertial patterns and vocals

This is well done.

Osprey Mission Bay, San Diego #photography #birds #naturephotography #wildlife #wildlifephotography #sandiego #nature #birdsky

Whimbrel and Marbled Godwit La Jolla Shores #photography #birds #naturephotography #wildlife #wildlifephotography #sandiego #nature #birdsky

Yellow-crowned Night Heron, juvenile Ocean Beach, California #photography #birds #naturephotography #wildlife #wildlifephotography #sandiego #birdphotography #birdsky #nature

To be fair, this isn't really a GPS antenna either. That is an antenna that someone sawed in half.

When a rare bird shows up, especially one as cool as a calliope, birders flock. @riceuniversity.bsky.social

#nokings San Diego Harbor today.

Allen’s Hummingbird @riceuniversity.bsky.social, our 274th species for this urban hotspot. Long overdue.

Nothing to see here, just delivering a dinosaur in Solana Beach .

Only one thing could top the honor of speaking at the No Kings rally, and that's the honor of speaking at No Kings 2. See you October 18th!

Not sure what's going on. This past week I discovered Red-footed Booby, Tropical Parula, and Western Wood-Pewee... and then today, an Allen's Hummingbird from California popped up on my morning walk to school. Houston, Texas. @riceuniversity.bsky.social

Here we go. We finally figured out where this bird disappears to. Red-footed Booby. One of very very few inland records of this seafaring bird. Houston, TX. Much better photos than yesterday's grainy shot of a flying bird from half a mile away.

In just a few days near Houston, Texas I found a red-footed booby, tropical Parula and a western wood-pewee, a truly bizarre and unlikely combination of birds.

Join us for Rack & Ride together with @sandiegomts.bsky.social and the San Diego County Bicycle Coalition for Rack & Ride! luma.com/event/manage...

New Paper! We investigate the first several months of postseismic motion following the M8.2 2021 Chignik earthquake on the Alaska subduction zone and how that motion can help improve our understanding of coseismc slip. ⚒️🧪 agupubs.onlinelibrary.wiley.com/doi/10.1029/...

MTS/NCTD Free Ride Day is this Wednesday! Last year's increased MTS daily ridership by 15% and NCTD by 28%. I bet we can beat it this year. www.kpbs.org/news/quality...

Second step, eat 🍦 while walking home along the board walk.

First step, take my favorite 🚌 (30) to PB ice cream.

We found this amazing katydid in Honduras. Haemodiasma tessellata. Camouflage at its finest.

Black-crowned Night Heron San Diego, California #birds #photography #wildlifephotography #naturephotography #sandiego #wildlife #birdsky #nature

How about a coral snake up close? Foothill forests of the Caribbean slope in Honduras.

One of the most important and magical shorebird stopover sites in the country is the Bolivar Flats Bird Sanctuary in Texas. It is currently under threat from development and we are in a race to save it. houstonaudubon.org/conservation...

A storm blew over last evening in Houston, TX. This AM, at Rice University, I was surprised to see a Vermilion Flycatcher (rare for an urban environment). While looking at the flycatcher, I saw a dragonfly I had never seen before - Twelve-spotted Skimmer! The 2nd record for our county.

Our paper by student Jia-le Mou, former student Jackson Borchardt and myself, Calibrating olivine Forsterite content as a measure of melting degree, is out. A simple and general calibration of how forsterite content varies with melting degree www.sciencedirect.com/science/arti...

Reddish Egret San Diego River Estuary #birds #birdsky #photography #sandiego #wildlife #wildlifephotography #naturephotography #nature #wildlife

NEW: Surface mass balance monitoring of an alpine glacier using GNSS Interferometric Reflectometry, Togaibekov et al. bit.ly/46ugyaI 🧪

Trump baby cookies have made it to La Jolla.

🐋 🐻‍❄️ 🦭 MASSIVE NEW FOSSIL DATABASE 🐋 🐻‍❄️ 🦭 Our FAMM (Fossil Arctic Marine Mammal) database has now been published #OpenAccess in Global Ecology and Biogeography! Come learn about the cool stuff you can do with #Arctic #fossil material and bio-molecular archives! ☢️ ⚛️ 🧬 Link and thread below! 🧵 1/🦴

Grace's Warbler, a bird of mountain pine forests from southwestern United States south into northern Central America. This one I photographed in Honduras.

The Fulvous Owl, a bird of mountain forests in northern Central America. Always a magical feeling when one encounters an owl deep in the woods. This one we photographed in Honduras.