Member (Idle past 1970 days)
From: Puyallup, WA.
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.|