2019 Mississippi River

Thankful to be in the current, interglacial period.

This thread had me putting everyone at risk on I-49 looking for signs of the Coteau Ridge the previous weekend as I drove north.

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Originally Posted by SlickRick

The Wilcox formation near pine prairie is approximately 10,000' deep. The same Wilcox about 150 miles offshore is over 30,000' deep below water line. Water depth over 5,000' deep. Can't remember more accurate depth details, just approximations.

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The Wilcox is about 4000-5000 feet in the Natchez area, and 6000 feet or so across much of Mississippi south of Jackson and north of Hattiesburg. Also approximations from a rusty memory.

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Originally Posted by HelmutVII

Go to my post 35 in this thread where I try to the best of my ability to describe land formation in Lafayette parish. the link to the NRCS soil survey has tons of very interesting information. Go to post 106 where I try to describe the location of the Coteau Ridge.

The maps in the NRCS soil survey will show ancient Ox Bows and river scars if you know what to look for.

You posted while I was editing.

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Amazing stuff.

Sae type of thing is real evident south of Abbeville along the Vermilion.

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Originally Posted by Duckster

If the Corps and the State will get going on adding more Mississippi River diversions flowing at will during high water south of NOLA into the marshes and let at least a small amount flow down Bayou Lafouche maybe the sediment will get put to good use. Try to mimic pre 1927 without putting human lives at risk. And if Morganza is not opening why not divert more flow into the Atchfalaya R. then kicking more into the Teche-Vermilion diversion during high waters?

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Wasn’t there a project the State was supposed to start working several years back called Mississippi Reintroduction into Bayou Lafourche?

This is a photograph of the wood chips that were recovered from 123 feet to 154'. They are very light and the strands are very flexible.

This is a photograph of the sand that was recovered from 154' to 185'. We were expecting to hit this at about 125 feet like we did in the other close by wells. There was a cleaner sand below this to 217 feet.

This is the e-log of the well. It shows overburden to about 130, the wood from 130 to about 158 and sand to 217. Below 217 is a break point of clay/silt that separates the Chicot Aquifer above from the Evangeline Aquifer below. I did some test wells south of this location and found the Evangeline Aquifer to be brackish so we were not interested in exploring any deeper.

Fascinating photos. Given enough time could that sand form sandstone. I’m totally uneducated in geology except for a few paragraphs in other disciplines.

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Originally Posted by VObserver

The Wilcox is about 4000-5000 feet in the Natchez area, and 6000 feet or so across much of Mississippi south of Jackson and north of Hattiesburg. Also approximations from a rusty memory.

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Not familiar with much below the Chicot and Evangeline aquifers as I am interested in finding drinking water. I would not doubt it though, as both aquifers get deeper and somewhat thicker as they progress south. The Evangeline Aquifer is brackish north of Lafayette and is flat out salty the closer you get to the Gulf of Mexico. Likewise for the Chicot but it gets Brackish near Abbeville and further south. The Chicot Aquifer really gets messed up around salt domes though. Very irregular water quality. I guess due to the eruption of the dome.

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Originally Posted by HelmutVII

Not familiar with much below the Chicot and Evangeline aquifers as I am interested in finding drinking water. I would not doubt it though, as both aquifers get deeper and somewhat thicker as they progress south. The Evangeline Aquifer is brackish north of Lafayette and is flat out salty the closer you get to the Gulf of Mexico. Likewise for the Chicot but it gets Brackish near Abbeville and further south. The Chicot Aquifer really gets messed up around salt domes though. Very irregular water quality. I guess due to the eruption of the dome.

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The Chicot aquifer runs all the way to the GOM, right? About what depths are we talking about for this Aquifer?

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Originally Posted by HelmutVII

This is a photograph of the wood chips that were recovered from 123 feet to 154'. They are very light and the strands are very flexible.

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Amazing. Could a study determine the type of wood?

(Also, Antarctica is rising at the rate of 1.6 inches a year. Due to ice melt some say.)

Back on topic: For a tree to survive the decaying process, whether upright or in a water rush current heap. Don't you think some sort of sediment protection would be involved. Probably followed by immense pressure.

I can't see tree matter surviving (not decaying) in ether manner with a slow sinking process.