July 16, 2018

Spring is a messy time

In many areas on Earth that get winter snow, spring thaw is a messy time. Frozen ground turns to mud, and there may be runoff everywhere from melting snow and spring rain. Or if you live in a place that […]
July 8, 2018

Field of barchans

It’s July, and I’ve had a busy summer so far. This is my first post in a few weeks – I’ve been out at various meetings, and last week I spent with my family on vacation. The one week of […]
May 30, 2018

The Mars Global Digital Dune Database

There are a lot of dune fields on Mars. Over the last ten years I’ve been part of a group that’s mapped out the big dark dunes on the planet to see where they form, and to understand the sedimentary […]
May 9, 2018


Here’s a grand dune, making its stately way northward under winds blowing mainly from the south-southeast (bottom to top), with a secondary wind blowing from the southwest (lower left to upper right). There are two rippled and sharp-crested slip faces […]
April 30, 2018

Wild & dark lacy dunes on twisty bright layers

Some windblown dunes on Mars are just beyond words. Take these beasts in this 0.95×0.95 km (0.59×0.59 mi) scene: These are a peculiar type of bedform called a transverse aeolian ridge, or TAR for short, with a spacing of about […]
April 23, 2018

Reusing old canvases

The wind on Mars is an artist, or at least it tries really hard to be one. It flutters up and down mountains, winding along valleys, dragging its wings in the sand and building up really amazing structures that could […]
April 20, 2018

Squish! ????

This isn’t a full blog post. Just something I saw while looking around for other things on Mars. And for once it’s (probably) not related to the wind. But it’s cool enough to share. I saw something that went “squish” […]
April 16, 2018

Flow. Lots of flow.

Over the years, many things have flowed across the surface of Mars: lava, ice, water, and wind. Two things have flowed in this image (the view is 0.75×0.6 km or 0.47×0.37 mi): Image credit: HiRISE ESP_026541_1840, NASA/JPL/Univ. of Arizona If […]
April 13, 2018

My 2018 paper on recent climate change in Meridiani Planum, Mars (Part 3)

This is the 3rd (and final) entry in a blog series describing a paper I recently published with colleagues in JGR Planets. Here are links to the previous two entries: Part 1, Part 2. Wow, I didn’t think this would […]