Links to DStretch Presentations

DStretch Presentations DStretch Home

My presentations started out by promoting DStretch at archaeology conferences. Later I have used them to document especially important or interesting sites. I even have a presentation about a mule trip I did to search for special cottonwood trees hidden in a remote canyon in the Sierra de Guadalupe. I am especially proud of the presentations I gave about Cueva San Borjitas and the migrations of the Great Mural artists.

	El Valle Mule Trip A mule trip to a remote valley in Baja California Sur (PDF.) I gave this talk at RA2023. Ken Hedges has edited the talk to fix some problems with the video (That I caused.) Here is the video.
	Little Great Murals More about the small figures found at many great mural locations. In addition to those at Cerro Murciélago which I presented at Rock Art 2022, I look at the rock art at Cueva Flechas, Monos de San Juan and at sites I visited on mule trips led by Eve Ewing. It seems to me that the shamanism explanation of this art has a problem if these paintings were a family affair. I gave this talk at ARARA2023 in Tuscon.
	Rock Art Near Cerro Murciélago, Baja California Sur Near Cerro Murciélago are a number of Great Mural pictograph sites. I have talked about some of the sites before (see Patterns of Figure Placement below.) This talk at Rock Art 2022 emphasizes the small figures in the panels. I believe they were done by children and that the paintings record a visit by a family. The talk I gave was recorded and can be seen here.
	A Leviathan in the Desert (Toños) Toños is a Great Mural site containing an incredible life size painting of an orca (killer whale). This is the largest pictograph in the world! There is much general information in the talk about orcas and the art and rock art inspired by them done by native peoples in North America. I gave this talk at ARARA 2019 in Flagstaff and Rock Art 2019 in San Diego. It was published in American Indian Rock Art 46:97-106 (PDF).
	Rancho Codornices: Great Mural Painted Sites in Baja California north of the known boundaries of Great Mural Art Rancho Codornices has Great Mural pictographs of striking beauty in addition to Northern Abstract sites. I have given this talk at *XIII Conferencia Internacional ANTROPOLOGÍA ´2016* in La Habana, Cuba, Rock Art 2016 , SCA 2017, and ARARA 2017.
	In Search of Padre Ugarte's Güéribo Grove. I gave this talk at the Yerba Buena chapter California Native Plants meeting in San Francisco May 11, 2016. It documents a mule trip I did in March 2015 searching for the grove that Padre Ugarte logged for timber to build the ship El Triunfo de la Cruz in 1719.
	Migrations of the Great Mural Artists An important use of rock art to document the migration of peoples. A paper based on the presentations has appeared in Rock Art Papers v18, edited by Ken Hedges and published in 2016 by the San Diego Rock Art Association. Here is a PDF (9mb). I have given a variant of this presentation at several conferences in 2014 and 2015: Balances (in La Paz for the first time), Rock Art (San Diego), MORAW (Zzyzx), SCA (Redding), SAA (San Francisco), and IFRAO (Cáceres, Spain).
	Two Great Mural Sites in the Sierra de San Borja:The Guadalupe Connection I describe two sites from the Sierra de San Borja and show a connection between the art there and the Sierra de Guadalupe. This may indicate the place of origin of the San Borja painters. Presented at the ARARA 2014 conference in Rock Springs, WY.
	A Tale of two Cañadas Describes a new Great Mural site in the Sierra de San Borja. It is not really the northernmost Great Mural site. I had forgotten about Cordornices. Presented at Rock Art 2013 in San Diego, November 2, 2013, INAH Balances Conference in Guadalupe Valley, November 22, 2013, and a shorter version at SCA 2014 in Visalia, March 22 2014. SCA Proceedings:Harman, Jon, 2014, "A Tale of Two Cañadas: The Most Northerly Great Mural Site Yet Discovered," 28:206-218.
	Patterns of Figure Placement in Great Mural Art near Mission Santa Gertrudis Presented at the INAH Balances Conference in Mexico City, September 24, 2012, at Rock Art 2012 in San Diego, November 3, 2012 and IFRAO in Albuquerque May 28, 2013.
	Three Pictograph Sites near Mission San Borja, Baja California Documentation of Northern Abstract sites near Mission San Borja. See also A Tale of two Cañadas. Presented at the Society for California Archaeology in San Diego, CA, March 2012
	The Monos of Cueva San Borjitas Documentation and analysis of the monos at San Borjitas. Presented at SAA 2011 in Sacramento, CA, and the ARARA 2011 conference in Idaho Falls, ID. For more about San Borjitas see Rock Art 2010 Balances 2010 and San Borjitas slideshows and visual index to images.
	Cueva San Borjitas:Birthplace of the Great Mural Tradition The implications of the superimpositions of monos at San Borjitas for Great Mural evolution. Presented at Rock Art 2010 in San Diego, CA, and the Balances y Perspectivas XI conference in Ensenada, Baja California, November 2010.
	The Rock Art of Campo Monte, Baja California Presented at Rock Art 2009 in San Diego, CA, and the Balances y Perspectivas conference in Mexicali, Baja California, November 2009. I originally called a site La Palmira, but now I think it should be La Palmita and have made the change here.
	Using DStretch to Reveal Patterns of Figure Placement at Two Great Mural sites Demonstrates that figure placement at these sites is not random, but follows patterns that can be recognized. Presented at the American Rock Art Research Association meeting in Farmington, New Mexico, May 2008.
	Two Great Mural Sites near Mission Santa Gertrudis, Baja California Documentation of Santa Gertrudis Norte and Cueva Muerto. Presented at Balances y Perspectivas conference in Mexicali, Baja California, November 2007.
	Pictograph Enhancement Using DStretch Presented at the Sociedad Mexicana de Antropología, Mexico City, Mexico, August 2007
	Kachina Rockshelter, Nevada Presented at the American Rock Art Research Association meeting in Billings, Montana, July 2007.
	Alvin's Last Road Trip: Pictograph Sites in the Snake Range Presented at the Nevada Archaeological Association session in honor of Alvin McLane Ely, NV, April 2007.
	A Pictograph Rock Shelter in Guadalupe Canyon, Baja California Presented at Society of California Archaeology meeting San Jose, CA, March 2007. Coauthor INAH archaeologist Antonio Porcayo.
	A Pictograph Rock Shelter in Guadalupe Canyon, Baja California. Publication Version Publication version of paper for SCA 2007 (PDF).
	A New Look at Rocky Hill Wonders revealed by DStretch at this Yokuts site. Presented at Museum of Man Rock Art conference in San Diego, CA, November 2006.
	Digital Enhancement of Pictographs From Baja California Presented at Balances y Perspectivas conference in Mexico City, Mexico, August 2006.
	Decorrelation Stretch Enhancement of Great Mural Paintings of Baja California Presented at Balances y Perspectivas conference in Tijuana, Baja California, November 2005.
	Pictograph Image Enhancement using Decorrelation Stretch Presented at Museum of Man Rock Art conference in San Diego, CA, November 2005.
	Using Decorreation Stretch to Enhance Rock Art Images One of the first DStretch presentations. Poster presented at American Rock Art Research Association meeting in Reno, NV, May 2005.