Fortunately, scattered oases of real forest helped Dwer pilot the company from one water source to the next, leaving markers for the next group.

But without having left markers, he knew it was useless.

They walked on, scanning the shadows, leaving markers at the foot of the Trees, trying to gauge their direction by the stars.

When things get better, growth resumes, but the stoppages leave permanent markers.

When Denning failed to carry his fellow judges with him, he liked to leave markers for the future in his dissenting judgments.

"We should have left markers on the trees," I said, "to find our way back."

Your old man did leave markers.

Injected hormones can also leave telltale markers in blood.

They had taught us what they felt we could grasp, and had left us clear markers as to their presence.

The latter has been confirmed by leaving markers in the roof of Manchester Hole amongst the flood debris.