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EvC Forum ⇒ Science Forums ⇒ Geology and the Great Flood ⇒

Exploring the Grand Canyon, from the bottom up.

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The Matt
Member (Idle past 5835 days)
Posts: 99
From: U.K.
Joined: 06-07-2007

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Message 200 of 283 (435705)
11-22-2007 1:52 PM 		Reply to: Message 199 by jar
11-22-2007 1:17 PM

Re: What is the layer above the Dox formation?
Andesite is a different type of lava. It has a different mineral composition to basalt (less silica, most significantly), and is generally a good deal thicker, leading to steeper volcanoes and more explosive eruptions.
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Andesite
Basalt
Also see here
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{Note from Adminnemooseus - Re: "(less silica, most significantly)." - The Matt is ambiguous about which volcanic type this refers to. It would refer to basalt. Andesite has more silica that basalt.}
​
Edited by Adminnemooseus, : See note above.
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 Message 199 by jar, posted 11-22-2007 1:17 PM jar has replied
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