In the pale light of the tunnel, 30-foot fossil traces of lycopsid gleam slickly in the shale roof like alligator skins.

它们看起来像一的芦笋。在隧道内黯淡的灯下，页岩顶部30英尺长的松迹就像鳄鱼皮般发出柔滑的亮。