 According to folk beliefs, fulgurites, belemnites, and sometimes even the remains of prehistoric stone tools found in the ground are remains of these weapons.Various Slavic countries also call these deposits "Perun's stones", "thunderbolt stones", "thunderbolt wedges" and "Perun's arrow"; other unrelated names for these include "devil's finger", "God's finger", and "Mother of God finger", and in Lithuania, "Perkun's finger" (Belemnitida).These thunderbolt stones were sometimes said to be transferred back to the sky by the wind after being under earth for a period of seven years.