A crystal clear day...

allowed for crystal clear vistas with North Window Arch easily seen from seven miles (11 km) away.

The Windows Section in Arches National Park. North Window Arch at near center skyline.

An effective sediment trap...

is functioning at the newly constructed Placer Creek crossing on what should be a self-maintaining structure. Recent storms have flushed fine sediment onto the concrete stream crossing where it has accumulated, rather than being continuously transported further downstream. More sediment is perched in the channel upstream to be mobilized in the next event, but at least the stream bed can’t erode or incise deeper at the road crossing.

Normally dry stream crossings...

turned into rapidly flowing muddy torrents within minutes in response to the passing of an intense thunderstorm cell. My neighbor and I were enrolled in the Bronco Off-Roadeo driving clinic and were out on the Dome Plateau trail undergoing guided training. It was absolutely perfect conditions to demonstrate the vehicle’s capabilities and the Bronco powered right through the mud and easily ascended wet and slippery slickrock.

Owl Draw on the Dome Plateau, north of Dewey Bridge.

Why the off road training? I am about to take possession of the 2025 Bronco Badlands/Sasquatch next week in Moab that I had ordered in late June this year. I’m somewhat excited!

Peering through Eye of the Whale Arch...

on the loveliest of autumn days. This was the destination of a 22 mile (35 km) out-and-back eMTB ride from Utahraptor State Park with friends this afternoon. Life is good.

Eye of the Whale Arch, Arches National Park. (Click image to supersize.)

The "Halloween launch" at the state line...

had me lofting the pumpkin-colored Moab Man rocket today. The second launch of the rocket involved a drag race with an identical rocket and identical engine.

Milliseconds after ignition, Moab Man accelerates skyward on a F15-4 motor.

Going up! Moab Man clears the rail.

Screen grab from a video of the drag race where both rockets were ignited at the same time. Big fun.

Rockin' out at Navajo Rocks...

on the mountain bike trail system during a magnificent autumn afternoon in the high desert.

Red beds of the Dewey Bridge Member of the Carmel Formation (Middle Jurassic (174.1-163.5Ma)) share a sharp contact with the underlying cream-colored Navajo Sandstone (Lower Jurassic (201.3-174.1Ma)). (Click to enlargenate.)

Flipped 1,000 miles...

on the new Trek Rail+8 on the singletrack in upper Castle Valley this afternoon. Perfect place to accomplish this milestone. It’s good to be back on Mars.

The view over the handlebars. Click to enbiggen.

UPDATE: This puts me at 72% of the distance of the Earth’s circumference at the equator (since September 2020)!

The foul odor and distinctive shape...

of the common stinkhorn fungus is presenting itself right on schedule, triggered by autumn rains.

Common stinkhorn (Phallus impudicus).

Another emerges the day after a gentle rain.

Insects are attracted to the foul smelling head where the spores are contained.

The highest summit in Idaho...

is dusted with the first snow of the season on a stormy afternoon. A violent 6.9 magnitude earthquake occurred in the Lost River Range on 28 October 2983 and created a 21 mile (34 km) long fault scarp at the foot of the mountain front.

Borah Peak (12,662 ft (3,859 m)). Note the prominent fault scarps at the foot of the lowermost slopes created during the 1983 earthquake.

US Forest Service interpretive site along a fault segment created during the 1983 event. Borah Peak is at the center skyline.

My 8th grade earth science teacher...

stoked my early interest in geology and, next to my parents, Ellis Underkoffler is clearly the most pivotal person in my early formative life. Here we are, now years later, at a regional meeting of the National Association of Geoscience Teachers, Ellis having invited me to deliver the keynote address at the conference highlighting my adventurous cave research in Central America. It was a fun reunion. Inspiring teachers are important!