The Holes Around Mars by Jerome Bixby Science Fiction Adventure

<p><strong>Allenby in command of the <em>Mars I</em> was first to set foot outside the ship. </strong>He took his one small step for man -- and found himself staring at the rock in front of him. It was about five feet high. Ordinary granite -- no special shape -- and several inches below its summit running straight through it in a northeasterly direction was a neatly round four-inch hole.</p><p>He made a pun and grunted.</p><p>Well I'll be said Janus our photographer. A hole.</p><p>In a rock added Gonzales our botanist.</p><p>Round said Randolph our biologist.</p><p>An <em>artifact</em> finished Allenby softly.</p><p>Before we were done we'd found similar holes all over the surface of the planet.</p>