Basque immigrant sheepherders left their marks on aspen trees in the American West

Our experience of documenting arborglyphs—"lertxun-marrak" in Basque—has deepened over time. At first, we simply tried to decipher what was on the tree. It can be hard to tell what is scarred bark and what is a carving. Gradually, we got better at deciphering the carvings and now hope to spot the oldest and most ornate.

We also came to appreciate the different styles and themes, like in signatures and writing. One herder carves his name, the date and his hometown; another delves into politics; and another carves a hoped-for female companion.

Viewing the decades-old carvings, we're surrounded by the quiet and solitude of the high mountain range, whether in the Sierra Nevada, Ruby Mountains or Sawtooth Mountains. We literally stand in the footsteps of the herder who created the arborglyph.

These herders left their marks on the aspens, and now we are part of a research collaboration that aims to document and catalog as many of their arborglyphs and the experiences they record as possible before they disappear. About 25,000 arborglyphs have been documented over time, and there are likely at least as many more left to be recorded before they're lost.

Carvings made over decades by Basque herders are endangered as their canvas, the aspens, are at risk. Sawtooth Mountains, 2011. Credit: Idaho Basque Arborglyphs Collection, Special Collections and Archives, Albertsons Library, Boise State University

Nudes are a frequent theme among Basque tree carvings. Credit: Joxe Mallea-Olaetxe Lertxunmarrak Collection, Jon Bilbao Basque Library, University of Nevada, Reno

A variety of animals are represented, including birds and mammals. Credit: Joxe Mallea-Olaetxe Lertxunmarrak Collection, Jon Bilbao Basque Library, University of Nevada, Reno

The same bird as in the previous picture, here captured by Jean Earl in a rubbing in the 1970s. Credit: Philip I. and Jean Moore Earl Basque Aspen Art of the Sierra Nevada Collection, Jon Bilbao Basque Library, University of Nevada, Reno