Tuesday, December 6, 2016

Purple Hill- Tonuco Uplift

View of Tonuco peak from the hidden canyon that cuts through the hill.

 I've named this little mountain that's about 1.25 miles long by .25 miles wide with 400 feet of relief (maximum) Purple Hill, well, because it looks purple. It gets its color from the extensive coating of gravel that is  a weathering product derived from an underlying layer of very purple andesite. Lying just southeast of Tonuco Peak( San Diego Mountain),  it is part of the Tonuco Uplift.
 We started out from the locked gate on  the power line road, after driving in from the Upham exit  and heading south. We began by walking cross country toward a little gap carved by a sandy arroyo at the very southern tip of the mountain. It's always interesting to keep an eye to the ground out here. The ancient river lain sedimentary rocks have been eroded and reduced to sand and a dizzying variety of stones,pebbles and gravel.  Crystalline  and cryptocrystalline quartz of many colors are the most eye catching, but it would interesting to  sift out a few square yards just to see what can be found.
 After passing through the little gap, we explored the valley on the west side of the hill. There, isolated mounds of the same conglomerate that have not been washed away completely( yet) give rise to sphinx like formations.

The cliffs  of the distant mesa have been dissolved into badlands.We followed the arroyo back into a narrow passage, where we were stopped by a dry waterfall. It might have climbable,but we went around and came down into the hidden little canyon from above on the north side. Following it back, we climbed out and went around its head and then proceeded north and then east off of the mountain, heading back toward our vehicle. We briefly walked  on  couple of  very old roads that see little to no vehicle use these days, to get us back. We saw blue birds flitting about in the creosote and mesquite, one joy of hiking the desert in the winter that I had forgotten about, but was happy to be reminded of.
Nothing to report as far as rock art, but this area is very scenic would definitely be more of destination were it not for the vagaries of property "ownership", albeit in this case by a publicly funded entity.
 Note:  Purple Hill and the surrounding basin are almost entirely within NMSU's Chihuahuan Desert Research Center land. The property is not posted along every fence line,but it is at intersections and entrances that are along dirt roads on the east side of I-25 and at the north and south entrances along the power line road.This is not public land, although the land was once open to public use. It appears that roads and arroyos  along the mesas and in the canyons still receive some use( we saw a few recent vehicle tracks),but mostly likely these are people that are coming from private property along the east side of the river. For the present, entering without permission  should be considered trespassing.
Tomato like fruits hanging from a vine growing on creosote bush.


Jean-Claude Linossi said...

I always enjoy ready about all your hikes in the area. I'm a hiker myself and I'm always happy to hear about new places to go. The fruit on the creosote bush in the last picture is from a Ubervilla vine.

Jean-Claude Linossi

devon said...

Thank for you kind comments Jean Claude. Thanks for the plant ID as well,but I can't find any further information under that name.

Jean-Claude Linossi said...

Hello Devon. My apologies, but I spelled the name of the plant incorrectly.
The name is Ibervillae Tenuisecta.
Common names, Slimlobe globeberry or Cutleaf globe berry.

U have one in my garden , it blooms every summer but does not produce fruit since you need a male and female plant to have pollination.

Hope this helps.

Les McKee said...

The Ocotillo hiker visit this area a couple time each year.
Finding the rock art, crystal and the abandoned Fluorite mine irresistible.
Thanks for reminding us that it is time to return.



Les McKee said...

The Ocotillo hikers took a 5 mile loop hike today, determined to find your Purple Hill. We wandered around, climbing dry waterfalls exploring narrow arroyos and finally arriving on the ridge above the Purple Hill. We could have been convinced we were in Utah. What a wonderful experience, one that I'm sure will just be the first of our adventures here. I have attached a link to our photos site so you can see us in action.


devon said...

The little canyons that cut through the tilted beds of sandstone and conglomerate I visited last year.I called them, get ready, " Tilted Rock Canyons" in my blog about them. Fun area to explore. I have couple more serpentine little canyons I want to look at on the southwest corner of that basin area- hopefully before this winter is done.

devon said...

Also, as always, nice photos Les. You guys were on the Purple Hill for a short part of your hike it looks like. I went to your highpoint spot last year as well( see my blog just called "Tonuco Uplift"),but I didn't give a name to that little mountain- so feel free.