Wednesday, July 06, 2016

rockin' in the free world

yep, still the venture vermont challenge. "Photograph and identify each of these three types of rocks: igneous, sedimentary, and metamorphic (10 pts)" it says.

ok, then.

this here is a piece of sandstone. it is smooth and river worn, but it is soft enough to scratch with a fingernail. it's a sedimentary rock.

this is a really good example of the metamorphic rock that makes up most of the schisty bedrock layer where i live, which is in the camel's hump - mount mansfield region. even if you don't know what kind of rock it is specifically, when you see folded layers like this, you are looking at a metamorphic rock.

if you want to know what in particular is going on in west bolton, i recommend this map, although it is devoid of keys. if you have sharp eyes and don't mind the color changes, you can use this key to decipher the bedrock layers.

really and truly, i'd like one map with a good key, but the map you can use lacks a key of any kind, and the really good key goes to a map that won't load any part but grand isle.

either way, the bedrock geology of the western part of the state is very different than the bedrock geology of the eastern part of the state, which explains why you see so much schist around waterbury reservoir and a hatload of granites up at marshfield pond.

...which brings me to the next thing: i was up at marshfield pond looking at the granites (igneous) and i saw this pretty little rock in  the water. here are two pictures of it.

pretty, yes? and both the same little piece of granite, just different light and background.

so that's my rock thing.

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