Joshua Tree National Park
Day 1 - a windy day, 20-35 mph winds with gusts to 45-50. So…we drove around the park to get the lay of the land. They have 3 visitor centers, we went to all three. Two of them had alot of information about the indigenous people who lived here and one had more info about the Joshua Tree. We did do one short hike because the wind drove us back to the car. I don’t mind alot of weather, but a cool wind is not pleasant.
Joshua Trees
The thing that boggles my mind the most is how the indigenous people survived in such stark conditions. However, they knew what they needed and how to find it. Those that lived in Cottonwood area of the park used the diverse plants for survival. They used the cottonwood trees as wood for housing. Boiled branches and leaves produced a wet plaster that relieved pain. Rocks served as grinding surfaces for nuts, seeds and berries. The spring nearby drew many animals that the native people could hunt. When I read about what they had to do to survive, I feel extremely spoiled.
Joshua Tree is actually made up of two different deserts, the Colorado Desert and the Mojave Desert. Joshua Trees only grow in the Mojave Desert section because it is higher, cooler and wetter. For example, we are staying in the Colorado Desert section and they had rain the day we arrived. That is the first rain they have had since July. We arrived on February 13th.
We learned about a desert cooler, which was used by early settlers to keep things like eggs and milk cold before refrigeration. It would be a cupboard door in the kitchen. Outside was a box frame covered in burlap. A water pan at the top would keep the burlap wet. Desert breezes evaporated the water from the burlap, cooling the area inside - just like perspiration cools your skin.
Minerva Hoyt campaigned for nearly 10 years in the mid 20’s to mid 30’s to have Joshua Tree land protected by the government. Joshua Trees were being set on fire to guide motorists. The cacti were being poached for backyards in Los Angeles. Overall destruction of the desert by unthinking visitors was Minerva’s motivation. In 1936 Franklin D. Roosevelt set aside 825,000 acres as Joshua Tree NP.
There are several Oases in the park. Much of this is due to the San Andreas and many other faults that crisscross through the park. As the Earth’s crust moves along these faults, rocks can block the flow of underground water. These underground dams force water to the surface to form oases.
Gotta wonder how many animals live under their cover
Day 2 - Wind made it a work day for Dave, craft day for June.
Day 3 - The wind died down and we were able to go for a 4+ mile hike today. We hiked the Mastodon Peak Trail. We saw a Palm Oasis, an old mine and interesting rocks. There is a lot more to a desert than you might think. The Oasis is atop a crack in the Earth’s crust. Geological faults crisscross the park. Groundwater that hits a fault plane rises to the surface and creates conditions for an oasis.
These are pictures of an old mine. The majority of the mining was gold, with some silver and copper. There were 300 mines at one time in this area before it became a park. This particular mine was established in the 1930s. However, none of the mines lived up to the dream of striking it rich. Considering the hard conditions due to heat, lack of water and lack of lumber I would think made it even more disappointing.


There are alot of cool rock formations/piles in the area and along the trail. Again a surprise to me that there are mountains and so many different terrains in a dessert. Guess I only think of the Sahara, just miles and miles of sand. Here is how these formed: The rock piles began underground long ago as a result of volcanic activity. Magma (monzogranite) rose from deep within the Earth. It intruded the overlying rock. The granite cooled and crystalized, forming horizontal and vertical cracks. The granite continued to uplift and contacted groundwater. Chemical weathering resulted and worked on the angular granite blocks, widening cracks and rounding edges. Eventually the surface soil eroded leaving monzogranite heaps scattered across the land like piles of to blocks.



There was one particularly interesting thing to me when we were at the peak. You looked out and it looked like there was a lake between two mountain areas. However, you know it couldn’t be because you are in the desert. Really made you understand the stories of water mirages.
It’s a little hard to see but look between the mountains, not at the sky, looks like a lake.
We went to a night program and learned about the nocturnal animals in the park and some of their adaptations. Here are a few interesting facts:
*Being nocturnal helps them survive because it is cooler at night, easier to hide from predators and less resource competition. (Competition example - hawks and owls eat the same thing. Hawks hunt during the day, owls at night)
*Owls have really big eyes to help them see at night. Proportionally if our eyes were the same size as owls, they would be the size of a softball.
*Most nocturnal animals have very good hearing, so predators need to be able to be quiet on the attack.
*Kit foxes two main adaptations are their very large ears and their paws are covered in fur so they do not make noise and also to help them maneuver across the sand, the fur acts like snow shoes.
*Pallid bat is unique in that it eats scorpions and centipedes, things that are on the ground. It uses its hearing to find a bug on the ground, then plops on the ground and crawls to the prey.
*Kangaroo rat has 90 times better hearing than humans. They can also jump 9 feet in the air. They have a very long tail to help them maintain balance and land on their feet. They showed a video of the rat jumping high away from an attacking snake.
*Tarantulas best sense is the hairs on their body, they are like tiny whiskers. They also make a web over the burrow they are in and have a leg on each string. If something comes by the burrow, it can feel it and attack. They release a venom that liquifies the preys insides and they have a straw like appendage to suck it out like a straw.
*Yucca moth is the only pollinator of the Joshua Tree. They lay their eggs in the Joshua flower. This is the only way both of these survive.
Day 4 - Today we hiked to Arch Rock and Heart Rock. Their names say it all. There were lots of other interesting rocks to look at.
Heart Rock
Arch Rock
Dave giving concept of size
Other cool rocks
These formations had a row of almost individual looking rocks running through it
We also went to Keys view where you could see a snow covered mountain top, the San Andres Fault and many, many miles.
The San Andreas fault is along the low brown mounds in the middle of the picture
This is interesting information about the San Andres Fault.
Our final short walk of the day was at Cap Rock. They had an interpretive trail. Here are a few fun facts from that trail:
Joshua Trees produce in two ways, by seeds or by producing tough offshoots from underground runners.
There are very few cacti in the Mojave desert because most rain comes in the winter. When the soil is cold it is hard for larger cacti to absorb enough water to survive.
I forgot to get the name of this one plant, but Juniper are throughout the park and they get water by having deep roots. This other plant doesn’t have that ability, so they siphon off the juniper’s roots.
A few other pics:
I enjoy climbing rocks
Joshua Trees and Rocks, this is a common site in the Mojave part of the park
The only animals we saw were these little lizards running around and a chipmunk type critter in our campsite.
Tomorrow we head to Death Valley NP.
Til next time.