It is one of those mushroom rocks, see here, that split in two.
Kodak TRI-X at EI 400, developed in HC-110 dilution H for 11 minutes, agitation: 2 inversions every 30 seconds
- Aperture: ƒ/5.6
- Camera: PENTAX MZ-S
- Focal length: 50mm
- ISO: 400
- Shutter speed: 1/125s