November 06, 2024

We have received heavy rain over the last two days, and I tried to keep the kids out of the side yard. I monitor them when I do let them out to make sure they are not mischievous (Loki is a digger and Zena is a roller) and end up covered in mud. Today the rain stopped, and I decided to brave our walk site at the lake. A portion of the walk is on a paved parking lot, but the majority covers packed dirt tracks that lead out to the end of two spits. We were the only ones there when we arrived to begin our walk. We walked to the end of the first spit and while it was wet, we were able to pick our way through the puddles without getting our paws muddy. As we were coming off the spit two 4-wheel drive pickups pulled out onto the other spit and began to cut mud tracks through the vegetation. As we walked around the paved lot on the trail the trucks moved to the area we had just left. This had a wider area that had been torn up by previous off-road activity. It did not take long for one of the trucks to get stuck axel deep in the mud. This was obviously why they had come in the first place. After extricating the truck, they drove to the boat ramp and took selfies of the mud covered truck to share with their friends. Teenagers in pickups are not the only ones that leave mud tracks.

When I looked online, I found one of the more famous mud tracks is located at Racetrack Playa in Death Valley. Racetrack playa is approximately 3 miles (4.8 km) long and 1.2 miles (1.9 km) wide and is located at a height of 3708 feet in a north-south valley east of the Panamint Range within Death Valley National Park. The playa receives only 3 inches of annual precipitation and is bounded on all sides by north-south ranges rising 1500 to 2000 feet (457 to 610 m). The surface of the playa is mainly dried clay and provides a hard, smooth, and level pavement. The sailing stones, also called sliding or walking rocks, move and inscribe long tracks along a smooth valley floor without animal intervention. The movement of the rocks occurs when large, thin sheets of ice floating on a brief winter pond break up in the sun. Rocks weighing up to 705.5 pounds (320 kg) travel across the playa and leave mud tracks. Stones with rough bottoms leave straight striated tracks, while those with smooth bottoms tend to wander. The mud trails differ in both direction and length. Rocks that start next to each other may travel parallel for a time and then one abruptly changes direction to the left, right, or even back to the direction from which it came. This phenomenon has been documented since 1948 and is not unique to Racetrack Playa. Tracks in the mud have been observed around the world.

Traditionally, these rocks were considered to be pushed by wind over a wet and slippery playa surface but observations from 2014 called this assumption into question and several aspects of the mud tracks remain a mystery. A thorough system was put up to investigate the rock movement that included a weather station near the playa, time-lapse cameras centered on the southeast corner, and 15 GPS-equipped boulders on the surface. The researchers went to the location for maintenance and data retrieval 5-8 times per year and from November to March of each year the time-lapse camera recorded hourly conditions. Interwoof GPS loggers were also installed in limestone blocks northeast of natural stones and captured GPS and temperature data every 60 minutes. The GPS trackers began recording constantly at one-second intervals after being triggered. The shape of the shallow lake named Ontario Lacus on Saturn’s moon Titan has been compared to that of Racetrack Playa.

THOUGHTS: Despite the signs and barriers forbidding driving on the surface and making mud tracks posted along parts of the playa, park rangers still find new tire tracks on it every couple of years. The walking rocks will not slide if the surface is defaced. Destruction of such natural wonders takes decades to repair. Act for all. Change is coming and it starts with you.