Chao E C
Science. 1976 Nov 5;194(4265):615-8. doi: 10.1126/science.194.4265.615-a.
Recently discovered mineral-produced, deeply incised striae and mirror-like polish on broken surfaces of limestone fragments from the sedimentary ejecta of the Ries impact crater of southern Germany are described. The striae and polish were produced under high confining pressures during high-velocity nonballistic transport of the ejecta mass within the time span of the cratering event (measured in terms of seconds). The striae on these fragments were produced by scouring by small mineral grains embedded in the surrounding clay matrix, and the polish was formed under the same condition, by movements of relatively fragment-free clay against the fragment surfaces. The occurrence of these striae and polish is key evidence for estimating the distribution and determining the relative importance of nonballistic and ballistic transport of ejecta from the shallow Ries stony meteorite impact crater.
本文描述了最近在德国南部里斯撞击坑沉积喷出物中的石灰岩碎片断面上发现的由矿物形成的深深切痕和镜面般的磨光面。这些切痕和磨光面是在撞击坑形成事件的时间跨度（以秒计）内，喷出物团高速非弹道运输过程中在高围压条件下形成的。这些碎片上的切痕是由嵌入周围粘土基质中的小矿物颗粒冲刷而成，而磨光面则是在相同条件下，相对无碎片的粘土与碎片表面摩擦形成的。这些切痕和磨光面的出现是估算喷出物非弹道和弹道运输分布以及确定其相对重要性的关键证据，该撞击坑为浅埋的里斯石陨石撞击坑。
