🪨🧱🏰

#stone wall #stonework #rock structure

🪨🕳️🪨

#stone opening #hole in rock #rock structure #arch structure #passage through stone #cave entrance

🪨🔬

#chert #microcrystalline #cryptocrystalline #silica #sedimentary rock #petrology #rock structure

⛰️↘️🧱

#mountain geology #fault line #rock structure #below fault