A nice, simple, straightforward, channelform complex, with a couple-or-three accretionary macroforms forming the bulk of the channelform sandstone body. Note the differential compaction of the underlying coals in relation to the hefty sands that got emplaced over it!
7 comments:
ooh, that's the one on I-70, right? Nice shot.
Bingo! I suspect that particular Highway (and, probably, all the roads in UT) have resulted in a fair number of insurance claims amongst geo-enthusiasts!
Bizarre contact relationship with the underlying beds! I wonder why the little coal seam resisted downcutting so well? At the extreme left of the panorama you can see how the channel eroded through the shale(?) bed but was apparently stopped dead by the coal seam, throughout most of the width of the photo. Seems to defy conventional wisdom that coal seams erode really easily. Very cool exposure and photo!
--Howard
Howard, I would not interpret that bit on the left end as an erosional cut into the shale, just a bit of cliffy weathering of the sandstone. So there's no need for the sandstone to have eroded the coal; rather, the coal was laid down in a channel and then gently covered by the sand.
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