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Author Topic:   Introduction To Geology
Member (Idle past 2154 days)
Posts: 652
From: Puyallup, WA.
Joined: 02-04-2003

Message 192 of 293 (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)

I think you may have made a mistake here. The intrusion can't be older than what it intrudes into.

you're correct below.

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.

This message is a reply to:
 Message 184 by Dr Adequate, posted 10-15-2012 11:57 AM Dr Adequate has responded

Replies to this message:
 Message 193 by Dr Adequate, posted 11-23-2012 2:37 AM DBlevins has not yet responded

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