天然沉积粘土都具有一定的结构性(组构和胶结)和结构强度。
The clays from natural sedimentation have always the structure (fabric and bond) and structure strength.
其他可靠的证据表明，边界粘土的沉积不可能需要100万年。
Other reliable evidence suggests that the deposition of the boundary clay could not have taken one million years.
粘土沉积分布在古代的火山表面和坑坑洼洼的高原地区，其中一些显然是最近才由于侵蚀而暴露出来的。
The clay deposits are scattered all over, in ancient volcanic surfaces and heavily cratered highland regions, some of which have apparently been exposed by erosion only recently.
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