Brian might not like it, but I think this t-shirt is pretty cool:
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« Should I be linking to you? | Main | Into the Bushveld #2: 'Look at the size of that thing!' »
Layer cake stratigraphy
Category: bloggery • geology
Posted on: February 5, 2008 7:30 AM, by Chris Rowan
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Comments
oooh...I do like it...i might have to get that
Posted by: BrianR | February 5, 2008 10:27 AM
What on earth are those clastic dikes doing looking like that?
Posted by: Maria | February 5, 2008 11:55 AM
Ok, so 'splain to me how you get an inclined-layered sequence sandwiched between two horizontal-layered strata.
Posted by: Divalent | February 5, 2008 4:51 PM
I've had that shirt since its first print a couple of years back. It's always inspired jealousy among my fellow geologists.
It's also a great conversation starter since no one has yet found a reasonable way the inclined sequence could be place between two horizontal strata. The best I've heard is the inclined layers slumped on a very shallow incline over the flat and were then eroded. But even that is pretty far fetched.
Posted by: Chris (goodSchist) | February 5, 2008 7:32 PM
Maybe the horizontal layer below the tilted beds is a shear zone, and everything further down is pseudo-stratigraphy. And that one layer partially melted to make the dikes. (Which would mean... very radioactive chocolate, or something?)
It's a core complex with an unconformity on top of it.
(Or maybe it's another volley in the jelly sandwich vs creme brulee argument.)
Posted by: Kim | February 5, 2008 11:16 PM
It's geofantasy! You know-- What you come up with when you have to have the cross section done by class at 8 am and that dang QC (quaternary crap) is hiding all the outcrops... :-)
mmm... chocolate geofantasy... I think I must make this shirt mine... :-)
Posted by: Jeri lynn | February 14, 2008 5:02 PM
From Massachusetts, the land where stratigraphy often needs "tectono-" placed in front of it to make it make sense...
The T-shirt is indeed very cool, and I want one! However, to play devil's advocate, it's painfully obvious that the whole section represented is on the overturned portion of a large nappe-structure, with the tilted layers representing the eroded remnants of the overturned limb, and the layers below unconformably laid on top. The top-most layers in the current stratigraphy are merely a weathered decollment (sp?) zone. The whole sequence was flipped into its present orientation by a secondary back-thrusting event, then baked at 350 degrees for 45 minutes... How's that for geo-fiction?
Posted by: Joe | February 15, 2008 11:58 AM