Beschreibung: A small thin piece of slate dropped from a short distance onto a solid rock surface.

Beschreibung: A small thin piece of slate dropped from a short distance onto a solid rock surface.

Beschreibung: A crack from a 2-3 inch diameter dry seasoned maple wood tree branch by a high velocity impact from a 30 pound rock.

Beschreibung: A crack from a 2-3 inch diameter dry seasoned maple wood tree branch by a high velocity impact from a 30 pound rock.

Beschreibung: A crack from a 2-3 inch diameter dry seasoned maple wood tree branch by a high velocity impact from a 30 pound rock.

Beschreibung: A crack from a 2-3 inch diameter dry seasoned maple wood tree branch by a high velocity impact from a 30 pound rock.

Beschreibung: A crack from a 2-3 inch diameter dry seasoned maple wood tree branch by a high velocity impact from a 30 pound rock.

Beschreibung: A large handful of 1/2 to 1 inch diameter white pine sticks dropped onto a rock.