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Boulder Rangers week: Homemade bombs found in Lefthand Creek, dog bites, assaults and trespass
Aug 23rd
• Two reports of criminal trespasses, one at Flatirons Vista Trailhead and the other at Doudy Draw.
• A report of a deer caught in an iron wrought fence. The deer had to be dispatched.
• A report of an assault near the North Wittemeyer property. Witnesses stated that a man was pulled out of a vehicle and beaten. Rangers assisted Sheriff’s Officers on this call but were unable to locate a suspect.
• A report of two dog bites. One hiker was charged and attacked by a Golden Retriever on the Gregory Canyon trail, while a boy scout was attacked by a Border Collie at the Green Mountain Summit.
Safety Reminder from Ranger Scott Wilkey:
To all;
I want to take this time to remind everyone that we live in a sometimes strange world.
A few days ago, a fisherman located what appeared to be a suspicious device in Left Hand Creek. I met with Boulder County Sheriff’s deputies there and upon investigation we determined that they were sufficiently suspicious to call the bomb squad.
The short story is that the devices were small homemade bombs with fuses.
They were about 6” long and made out of ½ or ¾ inch PVC pipe. They had end caps and fuses. Both devices were very powerful and dangerous despite having been in the creek for who knows how long.
I urge all OSMP folks in the field to take caution. We all see a lot of different things out there but if it seems suspicious to you…
CALL A RANGER.
I know I speak for all of us when I say that we have no problem responding to check out a suspicious device, person or situation.
Please be safe out there, everyone.
Volunteer Day at Cure Organic Farm
We had 25 volunteers show up to help harvest tomatoes and new potatoes at Cure Organic Farm on Thursday, August 15th. Before heading out into the fields, Lauren Kolb, ag resource specialist, spoke about this history of agriculture in Boulder County and how Open Space is helping to keep this rich agricultural tradition going by providing leasable land for farmers and ranchers.
Anne Cure, a three year tenant of the Eccher parcel on Valmont Road, talked about the evolution of her operation. Anne started Cure Organic Farm with 4 acres and an 80-family CSA. Today, Anne has expanded her operation to 12 certified-organic acres which supports a 185-family CSA. Anne typifies a diversified operation, not only in the number of vegetables she grows, but also with a variety of other revenue streams: a day camp for kids, cut flowers, two farmers markets, 12 restaurant customers, and a menagerie of animals including ducks, chickens, sheep, and pigs. Expanding onto OSMP property has allowed Anne to de-intensify her production: instead of growing three vegetable crops on the same piece of land in a single growing season, she can give the land a rest by planting cover crops to allow the soil organic matter to rebuild.
With the help of our volunteer crew, Anne harvested 332 pounds of heirloom tomatoes and 2,622 pounds of potatoes for her CSA and farmers’ market, much to the delight of her interns. After finishing in the field, Anne treated the volunteers to some extra produce—potatoes, squash, radishes, chard, and zucchini! We’ll be sure to be back in September and October to help with peak harvest.
Trailheads
Jay Jones and crew built a new ADA compliant picnic / meeting site, on the pathway for Crown Rock.
Last week:
- Hauled building stone to work site at Crown rock
- Removed old table and excavated footprint for improved picnic area
- Dug bench for rock wall
- Installed two tier rock wall and graded surface
Jennelle Freeston
Coordinator of Volunteer Services
City of Boulder Open Space and Mountain Parks
66 South Cherryvale Rd.
Boulder, CO 80303
FreestonJ@bouldercolorado.gov
Phone: 303-413-7656
Cell: 303-818-6972
www.osmp.org
CU-Boulder research efforts dates oldest petroglyphs known in North America
Aug 13th
The petroglyphs located at the Winnemucca Lake petroglyph site 35 miles northeast of Reno consist of large, deeply carved grooves and dots forming complex designs on several large limestone boulders that have been known about for decades, said CU-Boulder researcher Larry Benson, who led the new effort. Although there are no people, animals or handprint symbols depicted, the petroglyph designs include a series of vertical, chain-like symbols and a number of smaller pits deeply incised with a type of hard rock scraper.
Benson and his colleagues used several methods to date the petroglyphs, including determining when the water level the Winnemucca Lake subbasin—which back then was a single body of water connecting the now-dry Winnemucca Lake and the existing Pyramid Lake—reached the specific elevation of 3,960 feet.
The elevation was key to the study because it marked the maximum height the ancient lake system could have reached before it began spilling excess water over Emerson Pass to the north. When the lake level was at this height, the petroglyph-peppered boulders were submerged and therefore not accessible for carving, said Benson, an adjunct curator of anthropology at the University of Colorado Museum of Natural History.
A paper on the subject was published this month in the Journal of Archaeological Science. Co-authors on the study included Eugene Hattori of the Nevada State Museum in Carson City, Nev., John Southon of the University of California, Irvine and Benjamin Aleck of the Pyramid Lake Paiute Tribe Museum and Visitor’s Center in Nixon, Nev. The National Research Program of the U.S. Geological Survey funded the study.
According to Benson, a white layer of carbonate made of limestone precipitated from the ancient, overflowing Winnemucca Lake had coated some of the petroglyph carvings near the base of the boulders. Previous work by Benson showed the carbonate coating elsewhere in the basin at that elevation had a radiocarbon date of roughly 11,000 years ago.
Benson sampled the carbonate into which the petroglyphs were incised and the carbonate that coated the petroglyphs at the base of the limestone boulder. The radiocarbon dates on the samples indicated the carbonate layer underlying the petroglyphs dated to roughly 14,800 ago. Those dates, as well as additional geochemical data on a sediment core from the adjacent Pyramid Lake subbasin, indicated the limestone boulders containing the petroglyphs were exposed to air between 14,800 and 13,200 years ago and again between about 11,300 and 10,500 years ago.
“Prior to our study, archaeologists had suggested these petroglyphs were extremely old,” said Benson, also an emeritus USGS scientist. “Whether they turn out to be as old as 14,800 years ago or as recent as 10,500 years ago, they are still the oldest petroglyphs that have been dated in North America.”
While Native American artifacts found in the Lahontan Basin—which encompasses the Winnemucca Lake subbasin—date to the time period of 11,300 to 10,500 years ago, it does not rule out the possibility that the petroglyphs were carved as early as 14,800 years ago, Benson said.
The oldest dates calculated for the Winnemucca Lake petroglyph site correspond with the time frame linked to several pieces of fossilized human excrement found in a cave in Oregon, said Benson, who also is affiliated with CU’s Institute of Arctic and Alpine Research. The caves, known as the Paisley Caves in south central Oregon, held not only fossilized human coprolites that dated to roughly 14,400 years ago, but also bones of horses and camels that went extinct in North America prior to 13,000 years ago.
The younger time interval calculated for the Winnemucca petroglyphs corresponds to dates obtained from a second significant archaeological finding in the region—Spirit Cave Man, who was discovered more than 70 years ago some 60 miles east of Reno and whose hair, bones and clothing were dated to about 10,600 years ago. The remains of the man, who was found partially mummified in a shallow grave in Spirit Cave, Nev., were discovered with a fur robe, a woven marsh plant shroud and moccasins.
Petroglyphs near Long Lake in central Oregon—which were previously thought to be the oldest examples of rock art in North America—share similar features with some of the rock art the Winnemucca site, said Benson. At least one of the petroglyph panels from Long Lake was buried by ash from an eruption of the nearby Mount Mazama volcano roughly 6,700 years ago, proof that it was carved sometime before the eruption.
“We have no idea what they mean,” Benson said of the Winnemucca Lake petroglyphs. “But I think they are absolutely beautiful symbols. Some look like multiple connected sets of diamonds, and some look like trees, or veins in a leaf. There are few petroglyphs in the American Southwest that are as deeply carved as these, and few that have the same sense of size.”
Benson obtained permission to non-invasively examine the petroglyphs from the Pyramid Lake Paiute Tribe, which owns the land. Study co-author John Southton, a faculty member at University of California, Irvine, radiocarbon dated the material for the study.
-CU-
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