Imprints: Photographs by Mark Ruwedel presents spectacular color and black-and-white images of dinosaur tracks and ancient human footpaths by preeminent American landscape photographer Mark Ruwedel. These works record the persistence of ancient tracks in the land over millennia and the strange and wonderful locations in which prehistoric evidence is found. In Ruwedel’s photographs, footprints appear and disappear inexplicably, descending into gorges, crossing rivers and circling mountains — mysterious mementos of peoples and animals from long ago. The photographs are beautiful and evocative, raising questions about the passage of time and the nature of photographic representation. This show is currently on exhibit at the Peabody Essex Museum’s Hilborn Gallery, and will be there through January 2, 2011.Â Â The PEM is located at 161 Essex Street in Salem.Â Directions and more information may be found at www.pem.org.