Peter Faris, August, 1993.
Friday, June 24, 2016
CUMULATIVE VANDALISM - THE IMPORTANCE OF ROCK ART RECORDING:
Ute panel, Sego Canyon,
Utah. Photograph: Peter
Faris, August, 1993.
Left side of Ute panel, Sego
Canyon, Utah. Photograph:Peter Faris, August, 1993.
We all have
seen examples of rock art panels badly vandalized in many different ways,
and we know of cases that have been reported from all over the world. I was
recently looking at rock art photographs online and ran across a photo of the
wonderful Ute Indian pictograph panel
from Sego Canyon, Utah, a site I have visited a number of times. I
thought this photograph looked different than I remembered so I went into my
files and found a photograph that I had taken of the same panel in August,
1993. I present both photographs here for your perusal, and to illustrate my
premise of the importance of not only recording rock art, but of making those
records available to other students of the field for comparison.
At this
level I can see two alterations to the panel right off. The first is the
addition of the name Jesus above the shield in the center. The second
alteration is the apparent addition of a ring of white hand prints around the
shield on the left.
https://www.eskimo.com/~noir/
southwestrockart/thomp6.jpg
In
my 1993 photograph of this panel the large initials "F.B." can already be seen so that vandalism occurred
prior to that year. Scanning photographs online of this panel I found one taken
between 2003 and 2007 according to its labeling that has the name "Jesus" added but no
hand prints around the shield on the left. So we can probably assume that the
name "Jesus" was added
between 1993 and the 2003-7 period. The hand prints appeared after the 2003-7
period. In this way we can begin to chart the progressing cumulative vandalism
of this important panel. Indeed, a person could make quite a project out of
accumulating a number of photographs of the same panel over a broad span of
years and record the history of its desecration. If anyone out there has any
further information on the apparent vandalism of this important rock art panel
I would be happy to hear it. Let me know!
NOTE: I
would be remiss in not mentioning the possibility that the hand prints could
have been added to a photograph of the panel digitally (i.e. Photoshopped), but
I am not skilled enough with computers to detect such alteration. If this were
the case I hope someone will also let me know that.
NOTE: Digital
copies of all my rock art photographs, with the pertinent information on time
and place, are in the Colorado Rock Art Archives at the Pueblo Regional
Library, Pueblo, Colorado.
RESOURCE:
The photo
with added hand prints was found at the website https://www.eskimo.com/~noir/southwest/rockart/thomp6.jpg
.
Labels:
pictograph,
rock art,
Sego Canyon,
Utah,
Ute,
vandalism
Saturday, June 18, 2016
THE LOW-DOWN ON HIGHEST ALTITUDE ROCK ART CLAIMS:
Pictograph at Abri Faravel,
southern France, 7,000' in elevation.
www.livescience.com
An article
published online at Live Science, by Stephanie Pappas, Live Science
contributor, and titled Highest-Altitude
Prehistoric Rock Art Revealed, claims that pictographs found at a rock
shelter in the southern French Alps named Abri Faravel, are the
highest-altitude examples of rock art ever recorded. "In 2010, researchers found paintings decorating the ceiling of
the rock shelter, consisting of parallel lines as well as what look like two
animals facing each other. Excavations reveal signs of human activity starting
in the Mesolithic (the period between about 10,000 B.C. and 5,000 B.C.) and
extending all the way to the Middle Ages." (Pappas 2016) Abri Faravel
is located at 2,133 meters (approximately 7,000 feet) elevation.
Now I have
read a number of Stephanie's articles in the past and am generally a big
admirer of her writing. The blatant inaccuracy of this one, however, just
cannot be passed up. I reread it for accuracy and found the statement that they
are the "highest-elevation
prehistoric rock paintings ever discovered." (Pappas 2016) As I looked
at it again I knew that this just could not be right so I got out my topo maps
and checked some sites from around Colorado that I was pretty sure would come
in at over 7,000 feet above sea level in elevation.
Promontory on a ranch outside of
Clarke, Colorado. 7,500' - 7,800' elevation.Photograph
Peter Faris, July, 1986.
Carrot man pictograph on a ranch
outside of Clarke, Colorado.
Photograph Peter Faris, July, 1986.
Cactus man pictograph on a ranch
outside of Clarke, Colorado.
Photograph Peter Faris,
July, 1986.
July, 1986.
I found a
couple of good examples from right here in Colorado. My first example is from a
rock shelter north of Steamboat Springs, outside of Clarke Colorado, on a private ranch. This is
a small shelter on a high promontory in the neighborhood of 7,500 to 7,800* feet
in elevation from my topo maps. In this unlikely location we found a couple of
red-painted figures and some undecipherable marks, which seemed to be Fremont
in style (although what Fremont were doing up there is a mystery to me).
La Garita painted panel, San Luis
Valley, Colorado. 7,700' - 7,800'
elevation. Photograph Peter Faris,
May, 2006.
elevation. Photograph Peter Faris,
May, 2006.
My second
example is the painted pictograph site from La Garita in the San Luis Valley in
southern Colorado. This wonderful site is assumed to be Ute in provenance. It
is somewhere around 7,700 to 7,800* feet in elevation as best I can work out
from the topo maps.
So what
about this claim that Abri Faravel contains the highest-altitude rock art ever
recorded. Did the original authors provide Stephanie with inaccurate
information, or was it just a misinterpretation. I will certainly give her the benefit of doubt. I suspect it was a
misinterpretation of a statement sort of like "it is the highest site discovered in (southern France, or Europe, or wherever)" that just got misunderstood. But it brings up a
great question. What would the highest elevation rock art site be? If you have
some candidates please let me know. Where is your highest elevation rock art site?
Disclaimer:
* * I did not get my elevations from USGS topo maps, but with the Colorado Atlas and Gazetteer from DeLorme, so I can only claim that the elevations I cite above are my best estimates.
Disclaimer:
* * I did not get my elevations from USGS topo maps, but with the Colorado Atlas and Gazetteer from DeLorme, so I can only claim that the elevations I cite above are my best estimates.
REFERENCES:
2016, http://www.livescience.com/54889-highest-altitude-prehistoric-rock-art-revealed.html
Labels:
Abri Faravel,
Colorado,
France,
highest elevation,
La Garita,
pictograph,
rock art
Saturday, June 11, 2016
A NEW DISCOVERY OF SPANISH CAVE ART HAS BEEN REPORTED:
Site
archaeologist Diego Garate
looking at cave paintings representing
horses in the Axturra cave.
Photograph: AFP/Getty Images.
looking at cave paintings representing
horses in the Axturra cave.
Photograph: AFP/Getty Images.
A story by
Ciaran Giles, writing for Associated Press in Madrid, Spain, on May 27, 2016,
outlines the discovery of new cave art in northern Spain.
"Spanish archaeologists say
they have discovered an exceptional set of Paleolithic-era cave drawings that
could rank among the best in a country that already boasts some of the world's
most important cave art."
(Giles 2016)
Bison image
from Axturra Cave.
(Diputacion
Floral de Bizkaia.)
Outlined
bison image from Axturra
Cave.
(Diputacion Floral de Bizkaia.)
"Chief site archaeologist Diego
Garate said Friday that an estimated 70 drawings were found on ledges 300
meters (1,000 feet) underground in the Axturra cave in the northern Basque
region. The engravings and paintings feature horses, buffalo, goats and deer,
dating back 12,500 - 14,500 years ago." (Giles 2016)
"The cave was discovered in
1929 and first explored in 1934-35, but it was not until 2014 that Garate and
his team resumed their investigations that the drawings were discovered." (Giles 2016)
"'No one expected a discovery
of this magnitude,' said Jose Yravedra, a prehistory professor at Madrid's
Complutense University. 'There are a lot of cave with drawings but very few
have this much art and this much variety and quality.'" (Giles 2016)
Bison image
with what the chief site
archaeologist
identified as 20 lance
wounds.
(Diputation Floral de Bizkaia.)
Outlined
bison image with what the chief
site
archaeologist identified as 20 lance
wounds.
(Diputation Floral de Bizkaia.)
"Garate highlighted one buffalo
drawing, which he said must have the most hunting lances stuck in it of any
such drawing in Europe. He said most hunting drawings have four or five lances
but this had almost 20 and it's not clear why." (Giles 2016) For the record I count more than twenty.
I find it
to be marvelous, and very exciting, that such discoveries are still being made
with such frequency. The more we discover, the more remarkable our ancestor's deeds really
were.
REFERENCE:
Giles, Ciaran,
2016 https://www.yahoo.com/news/spain-cave-art-trove-found-1-000-feet-144318822.html?nhp=1
The photographs that accompanied the article being reviewed were provided by Diputation Floral de Bizkaia.
The photographs that accompanied the article being reviewed were provided by Diputation Floral de Bizkaia.
Labels:
Axturra cave,
bison,
cave art,
pictograph,
rock art,
Spain
Saturday, June 4, 2016
SOME BEAR PAW PRINTS IN ROCK ART:
Bear paw prints, found in the 1st
canyon north of Dominguez
Canyon, Mesa County, Colordo.
Photograph Peter Faris, June 1980.
Back in the 1980s, James D. Keyser pointed out the value of
sources of Plains Biographic Style art such as robe painting and ledger book
art as a lexicon for understanding Plains Biographic Style imagery in rock art.
Since then he has used these insights as the basis for his tremendous
contributions in interpreting so much of the rock art of the northern Great
Plains. Other possible sources of factual comparisons could be name glyphs,
shield symbolism, and horse and tipi painting.
Sieber Canyon, Mesa County, Colorado.
Photograph Peter Faris, 1981.
Green River, Utah. Photograph
Paul and Joy Foster.
Fremont Indian State Park, Utah.
Photograph Peter Faris, 1992.
I have since
suggested that Hopi Clan registers might serve the same role as a valuable
lexicon for many Ancestral Pueblo rock art symbols from the southwest. A
wonderful reference into many of these symbols is found in a 1894 document from
Hopi clan chiefs to U.S. government officials in Washington D.C. urging them to
cease the reallocation of Hopi lands into individual holdings, and also to
designate official Hopi reservation boundaries. This document “was signed in clan symbols by 123
principals of kiva societies, clan chiefs, and village chiefs of Walpi, Tewa
Village, Sichomovi, Mishongnovi, Shongopovi, Shipaulovi and Oraibi.” (Yava
1978:167) These identified symbols surely provide a useful lexicon for rock art
imagery in the Southwest.
Hopi Petition of 1894, Page 9.
Bear Clan Sign, Hopi Petition of
1894, Page 9, No. 70.
Bear Clan Sign, Hopi Petition of
1894, Page 11, No. 84.
Bear Clan Sign, Hopi Petition of
1894, Page 12, No. 95.
Bear Clan Sign, Hopi Petition of
1894, Page 14, No. 122.
Bear paw prints are one common symbol in rock art from the Southwest, and indeed
from the rest of North America as well. Of course, a
Hopi clan register lexicon cannot be imagined to apply to examples from areas
with different cultures, but within the greater Ancestral Pueblo cultural area
we can assume that their beliefs influenced all peoples to some extent.
The examples I have
herein are from the area where the Fremont culture predominated prehistorically
and that Numic peoples inhabited historically, in these examples Ute and Paiute
peoples. It is assumed that some cultural influences and transference occurred
between northern tier Ancestral Pueblo and southern Fremont peoples so perhaps
a case might be made for a Bear clan among various groups of Fremont peoples.
We know that the bear was of great importance to Ute peoples, their annual Bear
Dance being one of their most important annual gatherings.
So I think it reasonable to suggest that a bear paw print
petroglyph or pictograph found within the greater Ancestral Pueblo area of the
southwest might be a clan identification symbol, while other areas would
require knowledge of the mythological and cultural symbolism of the bear to
make an educated guess as to its meaning. Last week I reviewed a book by James Keyser and George Poetschat, Seeking Bear: The Petroglyphs of Lucerne Valley, Wyoming, does an excellent job of addressing Bear symbolism in that area of Southwestern Wyoming. It could (it should) serve as a model for examining meaning in rock art of other areas.
Note: One other remarkable things about bear paw prints is that, unlike most animals, if they are well made you can differentiate the front print from the rear print. The rear print may be associated with locomotion/travel but the front print is the one associated with danger. That is the one the bear rips you with. This suggests that front and rear paw prints might have different meanings when reproduced on the rocks.
Note: One other remarkable things about bear paw prints is that, unlike most animals, if they are well made you can differentiate the front print from the rear print. The rear print may be associated with locomotion/travel but the front print is the one associated with danger. That is the one the bear rips you with. This suggests that front and rear paw prints might have different meanings when reproduced on the rocks.
REFERENCES:
Keyser, James D. and George Poetschat,
2015 Seeking Bear: The Petroglyphs of Lucerne Valley, Wyoming, Oregon Archaeological Society Press, Portland. www.oregonarchaeological.org.
Yava, Albert
1978 Big
Falling Snow: A Tewa-Hopi Indian’s Life and Times and the History and
Traditions of His People, University of New Mexico Press, Albuquerque.
Labels:
Ancestral puebloan,
bear paw prints,
Colorado,
Fremont,
petroglyph,
pictograph,
rock art,
Utah,
Ute
Saturday, May 28, 2016
SEEKING BEAR, A BOOK REVIEW:
Cover.
I want to introduce you to another wonderful book by Jim Keyser
and George Poetschat, Seeking Bear: The
Petroglyphs of Lucerne Valley, Wyoming, 236 pages. Published in 2015 by the
Oregon Archaeological Society Press, Portland, with well over 100 illustrations
and tables it is another in their series of in-depth studies of rock art of the
northern Great Plains and Basin. The Lucerne Valley, Wyoming, is an area in
southwest Wyoming that has not been studied extensively in the past, so this
volume greatly expands knowledge of rock art of that part of Wyoming and the
adjacent areas of Colorado and Utah.
Among these contributions to rock art knowledge are
documenting the presence of rock art styles in the Lucerne Valley which are
known from other areas, expanding the knowledge (at least my personal
knowledge) of them and enlarging the region that they are pertinent to. The first of these is the Classic Vernal
Style of Fremont rock art which is found so magnificently around Vernal, Utah, and
the Dinosaur National Monument. I had not known of any examples of that style
of petroglyph farther north than Brown's Park, Colorado (although it is close
enough to be expected). Also images in the Lucerne Valley were documented that
the authors attribute to the Uncompaghre Style of rock art, named for examples
around the Uncompaghre Plateau, south of Grand Junction, Colorado. Also the authors explain one image in terms of
the meaning of elements of the Dinwoody Style of petroglyph found in the Wind River
Valley farther north in Wyoming. These examples of relating images to styles
from other locations illustrates that the people of the Lucerne Valley were
tied in to the cultures of their larger world, whereas we have tended to
overlook that area as an isolated border region between other populations (once again affirming that it is dangerous to use our modern assumptions in evaluating past cultures).
In analyzing the images illustrated in the rock art panels,
Keyser once again illustrates his amazing ability to see fine detail and to
recognize elements overlooked by other people. This book provides many succinct
demonstrations of how much can be learned by really detailed examinations of
rock art. One example is a listing of six animals at one site and noting the
position of the tail of each animal. Elsewhere the shapes of antlers on cervids
are also compared.
One of the high points to me in reading this book is the
authors' ability to explain many of the concepts that we often feel strongly
about but have not reasoned through. On page 148, a discussion of rock art
symbols and their meanings provides a masterful summation of many of the
various popular and New Age explanations of rock art that frustrate so many
real students of the subject. Also, on page 186, their detailed presentation on
the perennial idea that rock art represents "hunting magic" could be
used in any college anthropology class on the subject.
All-in-all, Seeking Bear, is a highly detailed, relentlessly
educational presentation of the rock art from a little known area which ties it
inexorably into the larger whole world around it. My only (and I emphasize only)
criticism of this wonderful volume is its lack of an index. For someone like
me, who enjoys pursuing a train of thought, idea, or insight, through a volume
by referring to the index this was a frustrating absence. I actually had to
read it through from beginning to end, and perhaps this was their intention all
along. Watch out -you just might learn something. Once again, my gratitude to
Jim Keyser and George Poetschat for this contribution to rock art studies and
literature. Thank you.
Keyser, James D. and George Poetschat,
2015 Seeking Bear: The Petroglyphs of Lucerne
Valley, Wyoming, Oregon Archaeological Society Press, Portland.
www.oregonarchaeological.org.
Labels:
book review,
George Poetschat,
Jim Keyser,
Lucerne Valley,
petroglyph,
rock art,
Wyoming
Saturday, May 21, 2016
ROCK ART, AND THE DEVELOPMENT OF INTELLIGENCE:
Disclaimer: Except for the direct quotes following, the content of this posting is completely my speculation, and neither Dietrich Stout or Scientific American can be held responsible for any mistakes or errors.
We rock art enthusiasts have long believed that the beginnings of rock art indicated a certain level of intellectual development in our human ancestors. Now, a remarkable article in the April, 2016, Scientific American (Vol. 314, No. 4), by Dietrich Stout titled Cognitive Psychology/Tales of a Stone Age Neuroscientist, suggests that learning to make rock art may have been an important factor in that intellectual development.
We rock art enthusiasts have long believed that the beginnings of rock art indicated a certain level of intellectual development in our human ancestors. Now, a remarkable article in the April, 2016, Scientific American (Vol. 314, No. 4), by Dietrich Stout titled Cognitive Psychology/Tales of a Stone Age Neuroscientist, suggests that learning to make rock art may have been an important factor in that intellectual development.
Stout reported that he and his collaborators learned to knap
stone, to recreate Oldowan type stone tools (2.5 to 1.2 million years BP), and
Achulean type stone tools (1.6 million to 200,000 years BP). This process of
learning to knap stone, and then the production of the tools, proceeded with a
series of brain scans to attempt to identify any neural changes.
"We suspected that learning to
knap would also require some degree of neural rewiring. If so, we wanted to
know which circuits were affected. If our idea was correct we hoped to get a
glimpse of whether toolmaking can actually cause, on a small scale, the same
type of anatomical changes in an individual that occurred over the course of
human evolution.
The answer turned out to be a
resounding yes: practice in knapping enhanced white matter tracts connecting
the same frontal and parietal regions identified in our PET and MRI studies,
including the right inferior frontal gyrus of the prefrontal cortex, a region
critical for cognitive control. The extent of these changes could be predicted
from the actual number of hours each subject spent practicing - the more
someone practiced, the more their white matter changed." (Stout
2015:33-34)
Rhinos, Chauvet Cave.
Wikimedia. Public domain
Lion Man, Hohlenstein-Stadel.
Public domain.
But, what excited me more upon reading this is that the
creation of the two tool types left detectable differences in the brain
changes. This leads me to what I believe to the reasonable conclusion that the
creation of any two types of object would have different effects upon the
development of the brain of the creator. In other words, cave painting and
Paleolithic bone and ivory carving would have enhanced the development of the
brains of their creators, and thus I think I can safely assume that this would also
apply to the act of creating petroglyphs and pictographs. That the creation of this rock art not only signaled a
certain level of cognitive development, it actually contributed to that
development, and the different types of creations made different contributions to that
development.
"The results of
our own imaging studies on stone toolmaking led us recently to propose that
neural circuits, including the inferior frontal gyrus, underwent changes to
adapt to the demands of Paleolithic toolmaking and then were co-opted to
support primitive forms of communication using gestures and, perhaps,
vocalizations. This protolinguistic communication would then have been
subjected to selection, ultimately producing the specific adaptations that
support modern human language." (Stout 2016:35)
Westwater Creek, Bookcliffs,
Grand County, Utah.
Photograph: Peter Faris,
September, 1981.
Sproat Lake, Vancouver Island,
British Columbia, Canada.
Photograph: Peter Faris, 1995.
REFERENCE:
Stout, Dietrich
2016 Cognitive
Psychology: Tales of a Stone Age Neuroscientist, pages 28-35, Scientific
American, Volume 314, Number 4, April, 2016.
Wikipedia
Labels:
evolution,
language,
petroglyph,
pictograph,
rock art,
tool making
Saturday, May 14, 2016
PETROGLYPHS - DIRECT VS. INDIRECT PERCUSSION REVISITED:
Hammerstone below petroglyph
panel, Wild Horse Draw, Canyon
Pintado, CO. Photograph
Peter Faris.
On January 17, 2010, I posted a column on
http://rockartblog.blogspot.com, Petroglyphs - Direct Vs. Indirect
Percussion? In this I argued that most, if not all, petroglyphs had to be
created by direct percussion and gave the reasons for this belief. I was
recently informed by James D. Keyser of a paper that he and co-author Greer
Rabiega published in the Journal of
California and Great Basin Anthropology, 1999, Vol.21, No. 1, pages 124 -
136, entitled Petroglyph Manufacture by Indirect Percussion: The Potential
Occurrence of Tools and Debitage in Datable Context. Keyser's comments
concerning examples of indirect percussion are well reasoned and quite
convincing, and are based on experiments reproducing fine or narrow lines on
stone by striking a "chisel stone" with a hammer stone.
Rock art on boulder,
Airport Hill, St. George, UT.
Photograph Peter Faris, 2002.
In his e-mail to me Keyser stated :
"I just look for the evidence, and
where one finds very precise dints repeatedly aligned with one another to form
all or part of a design the chances are that that design (or the very precise
part of it) was produced by indirect percussion. Very finely made antlers (and
other extremities) on small images of deer in Valcamonica rock art are a good
example, but there are many others. Most often the examples of this sort of
work that I can think of off-hand are small parts of larger figures (but
the entire figure itself is still not very large—say a deer that can be covered
with a playing card)." (Keyser 2016)
"When a small part of a glyph
occurs routinely (like the aforementioned Valcamonica antlers) without even one
misplaced dint it begins to defy statistical probability that these were done
freehand—when such a simple solution (indirect pecking) was available and can
provide a guarantee that no dint will be miss-hit. If such finely produced
antlers were relatively rare—so that there were a few of many that had no
miss-hit dints, then one could argue that the very precise ones were simply
normal variation, but when one sees dozens of examples of such deer at site
after site—all of whom have antlers, legs, hooves, and open mouths—with nary a
miss-hit dint in the bunch—a student must begin to look for a way that this was
done that essentially “guarantees” accuracy EVERY TIME THE STONE IS STRUCK. Indirect percussion is
the only means by which this can be accomplished (with such a guarantee) that I
can come up with....I’d be glad to know." (Keyser 2016)
evidence of impact with the chisel
stone on its side. ( Keyser , James
D., and Greer Rabiega, 1999).
I am actually more convinced by what he did not find than by
what he did. Keyser reports large numbers of fine lines in petroglyphs with no
evidence of the mis-strikes that one would expect to find if only direct
percussion had been used to produce them. Now this is a telling argument and I
take it very seriously as I have to agree with Jim that the lack of missteps is
suggestive of an accuracy very difficult (I am sure he would say impossible) to
achieve with only direct percussion.
I do feel compelled to note, however, that this paper and communication are both about an experiment, and that he has not yet reported finding such chisel stones. Admittedly, there has probably been little awareness of their possibility so no one has looked for them. Also, Keyser also commented that as they are smaller and lighter than the hammer stones they may have regularly been carried away as useful tools, not dropped in the ground when the petroglyph is done as so many hammer stones were, " that’s the beauty of a chisel stone—you can carry two or three dozen of them with the same weight as a single good-sized hammer stone." (Keyser 2016)
I do feel compelled to note, however, that this paper and communication are both about an experiment, and that he has not yet reported finding such chisel stones. Admittedly, there has probably been little awareness of their possibility so no one has looked for them. Also, Keyser also commented that as they are smaller and lighter than the hammer stones they may have regularly been carried away as useful tools, not dropped in the ground when the petroglyph is done as so many hammer stones were, " that’s the beauty of a chisel stone—you can carry two or three dozen of them with the same weight as a single good-sized hammer stone." (Keyser 2016)
Bird Rattle carving petroglyph,1924,
Writing-on-Stone, Alberta, Canada.
Blackfoot.
I am enclosing this picture of Bird Rattle producing a petroglyph at Writing-on-Stone, Alberta, Canada, in 1924, as it is the only illustration I could find of petroglyph production in an authentic context. It really does not apply to the question here, however, as this petroglyph was produced by incising, not by pecking, so the techniques under discussion were not used by Bird Rattle.
Bird Rattle carving petroglyph,1924,
Writing-on-Stone, Alberta, Canada.
Blackfoot.
Note:
until such a chisel stone is reported in context at a petroglyph site this is
all conjecture based only upon logic and his reported experiments, but then my
original statement was also. Remember, the absence of proof is not proof of
absence. So, thank you to Jim Keyser for his information and help. I
appreciate that you took the time to help me clarify this question. Correction noted Jim, and thank you. I will temper my opinion accordingly.
And I also must confess that I have never examined the fine lines in a petroglyph for this phenomena, superimposition yes, mis-strikes no. So in the future I will have another line of evidence to look into.
Those who would like to dig a little deeper into this example are referred to the 1999 paper by Keyser and Rabiega, cited below.
And I also must confess that I have never examined the fine lines in a petroglyph for this phenomena, superimposition yes, mis-strikes no. So in the future I will have another line of evidence to look into.
Those who would like to dig a little deeper into this example are referred to the 1999 paper by Keyser and Rabiega, cited below.
REFERENCES:
Keyser, James D., personal communication, May 7, 2016.
Keyser , James D. and Greer Rabiega,
1999, Petroglyph
Manufacture by Indirect Percussion: The Potential Occurrence of Tools and
Debitage in Datable Context, Journal
of California and Great Basin Anthropology, Vol.21, No. 1, pages 124 - 136.
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