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Bob Libra
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Someone asked me about the "Yakima Crack" the other day. Here's a an update.

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Cape Town is getting close to the bottom.

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A couple oldies. One cell of a three-stage sewage lagoon planned to serve a small NE Iowa town. The cell was cut to with 5 feet of the Ordovician Galena Limestone, a quite karst-prone rock strata. A fair amount of overlying glacial till and loess were stripped to bring it to grade. The unconsolidated cover masked any obvious karst like sinkholes in the immediate area.
As the system was close to completion the area had big rain and the town directed storm water to one of the cells to check 'er out. That was on a Friday; by Monday they saw the lagoon had drained into a small sink with rock visible. Ponding water even on compacted glacial soils still may cause sloughing of the sediment into underlying voids. A huge amount of $$ went down that drain.
That's me in the middle of the lagoon 35 yrs ago, and my boot at the hole. The boot and hole picture, I'm told, is the most famous picture of me around. And some say it's the only one to catch my good side ;).
I'm doing a bit of work on a similar situation now. Hopefully we won't have to relearn this lesson!
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11/22/17
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It was 42 yrs ago today the Edmund Fitzgerald and its entire crew sank in Lake Superior. The Fitz' had left the docks in Superior WI the day before; Superior shares the harbor on the west tip of the lake with Duluth MN. I was in college on my home turf in Superior then.
One of the things I remember about the night she went down was the TV stations in Duluth-Superior breaking in with a call for the crew of the Cutter Woodrush to report. It was the only Coast Guard vessel on the Lake - and was almost the whole lake away from the sinking. It went to the site full throttle but too late.
The Woodrush had a bit of a history beyond the last (so far) Great Lakes shipping loss. It went to Alaska, was involved in a major cruise ship rescue off the British Columbia coast, and was a first responder to the Exxon Valdez mess.
The boat was decommissioned in 2001 but is still on the job; it was sold to the Ghana Navy. So at least in it's 70's it's a warm retirement place and doesn't have to break ice anymore ;)
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It's not just DC - the R's have a Little Swamp on the Prairie here in the cornfields as well.
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A blog on the soft shaky sediments below Mexico City. and where things collapsed.
CDMX's Seismic Sediments
CDMX's Seismic Sediments
policyambiental.com

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Random geo-photo: the contact between crystalline Precambrian ore rocks and the overlying Cambrian Deadwood Sandstone at Homestake gold mine in Lead South Dakota. Homestake is an open pit and underground mines to 8000 ft below the surface. By the end of it's day, they'd found 55 billion reason$ for the mining.
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While the Gulf Coast floods, the West is Burning.
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Eclipse Day in Iowa - Safe viewing gear is locked and loaded!
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