I've considered rock and stone as surfaces, as substrates (e.g., for lichen), as stelae, as sculptural forms... and I began with some in Marblehead in 1965:
and cropped and tessellated that one recently:
...and continued on to scanned negatives from Pebble Beach in San Mateo County California in 1968:
and then on to some more recent rock stuff:
Locally, Marshall Point is inexhaustible. During our most recent Nova Scotia trip we returned to Blue Rocks in Lunenburg County and did scores of photos that are still finding their way through Lightroom. And I'm contemplating a more systematic project on stone walls, waiting for the first snowfall to separate the walls from their roadside and woodsy surroundings.