Showing posts with label geology. Show all posts
Showing posts with label geology. Show all posts

Thursday, October 29, 2020

Down the Road a Piece: A New Bridge



Since 2001 a thousand times on walks I crossed that crumbling concrete asphalt-topped Doc Sargent Road bridge across the creek, maybe 15 feet wide and 18 inches deep at that point, and maybe 50 times I waded beneath the bridge to hunt fossils, once scooping up a crawfish that bit me, a couple of times treading quicksand, and then after a storm one of the two ducts under the bridge got clogged with sand, and at the next serious rainstorm the mild-mannered LaBarque Creek began flooding in a foaming hurricane rush like I'd never seen, tore up stuff, then two years later did it again.

They're replacing that bridge. (Here's my 2018 post with a photo of the old bridge.) Work began in August. At 7 a.m. weekdays they're backhoeing and scooping and whatnot. Naturally I wanted to see, went over and asked a construction worker when they'd finish. He said, "Round Christmas." Here are some pictures. Where the bridge was is a tangle of naked, rusted rebar.

Considering that those toothpick-and-tar-paper new McMansions are built in two weeks from start to finish, they must be building a very good bridge here. Notice the pure-white sand. That's the sought-after St. Peters vein of sandstone than runs in a strip from Minnesota to here, and is still mined today in Pacific.

Sunday, May 15, 2016

Is This Pollution?


Knock me over with a feather, this little pool way back in the woods turns out to have all-natural soap suds. As you know, soap is made from plants. Running enough water over decaying leaves and logs releases "surfactants" like the those in your Joy and Suave bottles that lift and dissolve oils. The woodland surfactants form a near-invisible film on top of water, most of the time. But pool the rushing water and churn it in a cove or a tiny pool like this one, and do it for a while, and suds appear naturally.

Most times in unpolluted conditions these natural suds are 99 percent water and air and 1 percent surfactant, so foam appears only under exacting conditions, and cannot be used as soap. It's just for looking at. This foam is white, but it can be off-white or tan. So relax. Unpolluted spots on earth still exist!

Friday, April 1, 2011

Seven Divine Waterfalls: Video Tour


The Divine property of 100 acres has seven dramatic waterfalls especially active in spring and visible to the world only in this 4-minute video I made, wanting to share them. They're on private land so here's your chance to see and hear them. They are all different and numbered in order of discovery. Narration by Divine Bunbun, who hung from trees and got all drenched and muddy enjoying every moment of filming.

Tuesday, March 8, 2011

Video Visit: The Secret Pond

Two-minute video, narrated by Divine Bunbun, of the secret, intermittent pond below the silica cliff, a La Barque Creek floodplain area so loaded with briars, mud and vines that it is accessible only in late winter or early spring. The Secret Pond is the home of sweet spring peepers and summer skeeters, and is a watering place of all woodland creatures.

Thursday, January 22, 2009

Waterfall #4: The Double Waterfall


Usually hidden from view by greenery, this double waterfall on the property can be photographed only in winter. The water here has turned to ice.

Tuesday, October 14, 2008

Fossil Fields

The bed of the mighty LaBarque Creek is a motherlode of fossils and a rockhound's Eden. The rocks are a perfect Chex Mix of limestone, sandstone, shale, chert (sometimes resembles arrowheads!), dolomite, hunks of iron, hardened clay, and marble. I find that the rocks with fossils are almost always turned fossil side up. Most fossils here are those of ancient marine plants, both simple and leafy, and simple animals, sort of like coral, called crinoids. My guess is that what you see in the close-up photo is crinoids. I don't know how or why I sleep when there is such cool stuff not 200 feet from my door.

Friday, February 29, 2008

I Sold A Diamond

I hated to sell, but I sold my diamond today, plus a few rings and things I liked but did not love, or that were broken. In return I received not thirty pieces of silver but $734 for the lot.

I knew this diamond for six years. It was .47 carats, grade SI1, color G, a solitaire set in 14K yellow gold, and my first and only diamond. Geologists say that the youngest diamonds are 20 million years old. So I had a very old and radiant companion. Whether it was wise I don't know. Unlike other gems I have known, this one was deaf and mute. It did not wink at me, or reveal its secret name. It was beauty and constancy incarnate, and absolutely nothing else.

My homework revealed that 24K gold is presently at an insane record-busting price high (this is technically called "price ecstasy") of close to $1000 per ounce. (You will of course get much less for 14K gold, which is 53 percent pure gold, the rest other metals). A diamond of like quality goes for about $850 wholesale, and an honest jeweler who is buying will give you perhaps 60 percent of that. The first jeweler I consulted offered me $250 for the lot. I left him staring at my afterimage, I fled so fast!

Now my stone will bring happiness and beauty to others -- for generations. It will exist until this planet is a cinder. I was a short interlude in its life. And as lovely as it was, it is just a material thing, after all. All is vanity and striving after wind.

Tuesday, December 25, 2007

World's Largest Icicle



Wind carved out this white sandstone cave in my woods. The ledge on top is perhaps dolomite -- harder than sandstone -- and I've seen trickling rainwater make a nice delicate waterfall in spring. The dropoff is about 12-15 feet. In the cave you can camp, sit nice and dry behind the waterfall, and build a fire (see my stock of kindling at picture's lower left). I'm not the first who's done it. A few years ago, my niece dug in the sand and unearthed an old-fashioned silver spoon.

Yesterday I went out hunting with the camera. Good thing I had it, because I have never before seen a monster icicle like this one; minimum 12 feet long. A wonder. Compare with the kindling pile, or the trees in the photo for scale. Some folks try to create giant icicles by pouring water off their roofs. This one is 100 percent Mother Nature's.

Wednesday, November 7, 2007

Backwoods Beachfront


You wouldn't know by looking, but this house was once a beachfront house, and it's sitting on a fortune.

Aeons ago a shallow lake covered the Midwest, and of course it had a beach. Its sand got weathered by wind, not water. The result was a vein of 99 percent pure white St. Peters silica sandstone, five miles wide, running from Minnesota down to to Missouri. My house perches right on it.

The cliff got detonated for road widening in 2002. Where it's been in the open air for some years, oxidation and water has turned the sandstone gray or red. Not far away there's a silica mine. In 50-lb. bags the old beachfront goes to make glass, chinaware, white paint, municipal water filters, and, coarse-ground, it's sold to make sand traps on golf courses. I like it just the way millions of years have left it.