siltstone
... sandstone 砂岩 siltstone 沙泥岩 limestone 石灰岩 ...
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无石英泥沙岩 quartz-free wacke
沙一段暗色泥岩 dark mudstone in Es_1 Member
这个在德国南部城市乌尔姆附近洞穴中的发现，至少可以追溯到28000年以前，它是用沙泥岩制成，并在破损后被丢弃。
The find, which has been dated to be at least 28, 000 years old and found in a cave near Ulm in Germany, was made from siltstone and was apparently discarded after being broken.
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