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Introduction To Geology

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Author Topic:   Introduction To Geology
DBlevins
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Posts: 652
From: Puyallup, WA.
Joined: 02-04-2003

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Message 192 of 294 (681112)
11-22-2012 4:44 PM 		Reply to: Message 184 by Dr Adequate
10-15-2012 11:57 AM

Re: Cross-Cutting Relationships
The brown sedimentary rocks (A) must be younger than the dike (B)
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I think you may have made a mistake here. The intrusion can't be older than what it intrudes into.
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you're correct below.
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Why must a dike or similar intrusion be younger than the rock into which it intrudes? Because a sheet of molten rock would not stand up by itself.
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 Message 184 by Dr Adequate, posted 10-15-2012 11:57 AM Dr Adequate has replied
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