第109章 旧河
新笔趣阁(52xbq.com)更新快,无弹窗!
第二天天亮前,苏晚词已经收拾好了。短柄铲、火折子、蜡烛头、麻绳、皮图,木盒被她留在了值房墙角的暗格内,没有随身携带。她需要找旧河床的入口,不需要再带一盒已经读过的纸卷。
她没有走北门。她从上次翻过的那处豁口出城,绕了一段距离,在砖窑北侧约一里处转向东北方向。皮图上标注的旧河床位置大致在三里外的缓坡地带,沿途地势逐步下降,土壤从干燥的砂质土过渡到更紧密的褐色黏土,夹杂着零星的小块砾石和砂砾。地面上的植物也开始发生变化,从耐旱的灌木过渡到根系更浅的草本植被,像土壤中的含水量曾比现在更高。
她走了大约两里之后,地形出现了一道明显的凹陷,呈东西走向,宽度约五丈,两侧的坡面被枯草覆盖,底部铺满了碎石和沙土,和之前探过的干沟相似,但更宽、更深,底部还残留着一条颜色略深的细线状沉积带,像是曾经的水位线留下的痕迹。
她没有直接下到河床底部,沿着边缘走了一段,观察底部的沙土分布和两侧坡面的结构。底部的沉积层比干沟更厚,有几处凸起的土堆,像是被水流冲刷后堆积形成的。她在一处坡面稍缓的位置下到河床底部,脚踩到底层的沙土时发出一种松软的声响,表层的沙粒在她的踩踏下从鞋底两侧翻起,落到旁边的碎石缝里。
她沿着河床的走向向北走了约一里,在一处弯道处停下来。弯道内侧的坡面上堆积着比别处更多的碎石,碎石的堆叠方式不像是自然沉积形成的,更接近被倾倒的废料。她走过去蹲下来,捡起一块碎石翻看了一下。表面有一层薄薄的灰白色附着物,和她在砖窑内壁见到的炭灰相似,但更稀薄。她把碎石放回原处,继续沿着弯道内侧的坡面走了一段,在坡面根部发现了一截露出地面的砖角,颜色与周围碎石完全不同,更老,表面有一层沉积层形成的泛白薄膜。
她用刀尖沿着砖角的边缘清理了一下覆盖的浮土,露出砖块的大部分。砖块边缘完整,没有破碎,不是自然散落在地表的碎石,是被人砌入坡面后又被掩埋起来的墙体的一部分。她沿着砖块的横向方向继续清理,又露出了下一块砖,连接紧密,砖缝填着灰浆,砌法规整。她清理出约三尺长的墙体后停止,把挖出的浮土重新推回墙面上方,只留了一截砖角露在外面,方便下次寻找。
她站起来退到河床对面一侧,从远处观察那道弯道的内侧,墙体所在的坡面位置与皮图上标注的入口位置大致匹配,入口还在更深的土层下面,被碎石和砂土覆盖着。她没有继续挖下去。她沿着河床走回弯道起点,翻上坡面,朝着砖窑的方向走了一段,然后在砖窑北侧那道干沟的入口处停下来。皮图上的旧河床入口和砖窑之间的距离比她预想的更近,通道很可能是连通的,只是被掩埋的部分比建成的部分更长。她沿着干沟的走向向南走了一段,在到达那道土埂之前停下,转头看了一眼砖窑方向。
她没有再返回河床,沿着城外的小径绕过水塘,从城墙根下的一道旧豁口翻回城内。她在东厢房门口停了一下,没有点灯,把鞋底的沙土在门槛上磕干净,然后把皮图从皮包夹层里抽出来摊在桌面上。她沿着从砖窑到干沟再到旧河床的路线用手掌根部的边缘比了一下,在每个节点上停留片刻,像在读一组已被标注过的清单。然后她在旧河床位置附近新添了一道浅色的线,与皮图原有边缘之间的距离较近,像一条只差最后一道压痕就能完全对齐的齿槽。
蝉翼笺在腕间没有温度变化。她把皮图卷起来放回夹层里,起身走到值房门口,把木盒从暗格里取出来,放在桌上,但没有打开。她只确认了盒盖边缘的那条细线还保持着原样,没有断裂。然后把它放了回去。风从窗缝里渗进来,吹在木盒表面,发出一道极轻的摩擦声。
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