Comments on: Friday Field Foto #48: Wall of plane- and ripple-laminated sandstone

By: Some photographs of trees « Clastic Detritus

Some photographs of trees « Clastic Detritus — Sun, 26 Oct 2008 16:37:51 +0000

[...] work was in the Delaware Mts of west Texas (I’ve blogged about this area before here, here, here, here, and here). Although madrones are common in parts of California, they are very rare in the [...]

By: Neoproterozoic turbidites in the Canadian Rockies « Clastic Detritus

Neoproterozoic turbidites in the Canadian Rockies « Clastic Detritus — Tue, 19 Aug 2008 16:03:52 +0000

[...] currents* and the sedimentary deposits they create - turbidites (e.g., here, here, here, and here). In fact, my current employer recruited and hired me because of my turbidite [...]

By: Friday Field Foto #54: Dust storm in west Texas « Clastic Detritus

Friday Field Foto #54: Dust storm in west Texas « Clastic Detritus — Fri, 06 Jun 2008 14:28:34 +0000

[...] Formation in the Delaware and Guadalupe mountains of west Texas (I’ve shown some photos here, here, and here). The outcrop belt is adjacent to the Salt Basin Graben, which is the easternmost [...]

By: Silver Fox

Silver Fox — Tue, 29 Apr 2008 22:54:03 +0000

Ha! Yes, that’s a good one. And some of the rocks I’m thinking of are called “meta-graywackes” – although I hadn’t really thought about it that much – they aren’t really very “meta” from some perpectives. :)

By: BrianR

BrianR — Mon, 28 Apr 2008 02:42:19 +0000

Silver Fox … these rocks are lithified (they’re Permian), but maybe from a hard rock perspective all unmetamorphosed sandstones look soft :)

By: Silver Fox

Silver Fox — Sat, 26 Apr 2008 19:34:40 +0000

From the photo, the sediments look rather soft, or not stronlgy lithified (?). Otherwise, I think parts of that sequence look a little like some turbidite beds exposed south of Anchorage, AK – although those are somewhat coarser grained, usually show some graded bedding, and overall have thicker individual beds.

The vertically stitched photo is a really good concept – one that for some reason I’ve never even thought about doing.

By: BrianR

BrianR — Sat, 26 Apr 2008 15:25:50 +0000

hmmm … a 1/3 of the way up … well, when you look at a more lateral view of this whole succession a bunch of truncation and ‘downlap’ surfaces are apparent. I would interpret some rather large barform-like features that migrated around and, in some cases, eroded into underlying sets (if you look a little closer, you can see some scour surfaces too). All the traction structures (plane- and ripple-lamination) is consistent with this. But, I’ve never studied this exact location in any more detail than that.

By: Lab Lemming

Lab Lemming — Sat, 26 Apr 2008 10:05:42 +0000

What’s that thing that looks like an upside down unconformity about 1/3 of the way up?