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

它们看起来像一棵棵巨型的芦笋。在黯淡的灯下，页岩顶30英长的石松化石遗迹就像鳄鱼皮般发出柔滑的亮。