"A rock composed mainly of pebbles is called a conglomerate. Conglomerates are sedimentary rocks that accumulated at places like pebble beaches or in offshore basins or channels where small stones might accumulate.
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"The quartzite of Mount Battie is very interesting because many features are preserved from before the metamorphism. From the summit area down the south side of the mountain, the rock is packed with small white shapes that were originally pebbles. The pebbles are embedded in light gray quartzite that used to be quartz sand. The light gray quartzite has microscopic bits of black mica, so it is not quite as pure as the quartzite that makes up the pebbles. "
目前我这儿山上有小卵石分布在大石头里的地方没法去了。在冬天 Palisade Interstate Park 把山上的小路都封住了，不让过。他们只铲大路上的雪，顾不了小路。要是有人或者车子在小路上出了事，控告州际公园，他们就糟了。所以干脆整季封山。等春天我过去照几张石头的照片。那儿石头里的卵石从玻璃弹珠的大小到乒乓球和网球大小都有。
发表于 2009-1-23 01:09:32
发表于 2009-1-23 19:24:21
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