- Enlarge level, glue paper and sifted soil photos using PhotoShop, or Paint.Net to show X and Y coordinates of fallen particles by pixel no. Common red ochre, charcoal and black manganese dioxide are easily seen in light soil or sand; yellow ochre and other pigments less so. Level and glue paper particle coordinates that do not match are counted separately,
- Petroglyph particles are fine dust. Hammerstone fragments are much larger and of different rock.2Some dust retains the dark outer manganese patina in desert art; some, the light-coloured rock interior. Where exterior and interior rock colour is similar, hammerstone fragments are used to define art levels.
- Table in columns by photo number; level; X and Y particle coordinates in level surface, glue paper, sifted soil photos and glue paper microscopy.
- Do particle locations match in level surface and inverted glue paper jpgs?
- Add distinct particle locations in part 25 to sifted level jpg locations. Total.
- Select bottom level with particles. Check glue sheet for AMS material.
- Remove particles with water-saturated Q-tip, place in gel caps, send to lab.
- As rock art sites were revisited in the past, upper particle levels can be dated. Particles falling from weathering are fewer than those from art application.