Grooves in a sandstone cliff reveal ancient tool sharpening . Published:2/21/2024 2/21/2024 • By Jeff Mitton. By rubbing a spear head against stone to form or sharpen it, ... Approximately 70 feet ...

Approximately 70 feet north of the Panel, I found two vertical grooves in the rock. They were about one foot long, about 3/8 inch wide and 1/2 inch deep and in cross section were V-shaped.

The sound of silence is a beautiful thing. Skeptics were dubious last year when the Vertical Groove driver was introduced. More than a few experts didn’t believe vertical grooves on a driver ...

Of course, the Vertical Groove Driver’s face pattern is much more extreme than barely visible milling marks. A pattern of 17 vertical grooves span the face area.

Drivers have looked much the same for a long time, but the launch of the Vertical Groove Driver could be set to revolutionize the equipment game.Revolutionary is not a word to use lightly, but in ...