Ron E. Posted July 19, 2009 Share Posted July 19, 2009 Boone Limestone, early Missisippian: That third image is super hi-res, don't download unless you're on a fast connection. Rock is 10" x 7". Each little groove is a tad less than a millimeter. Coral? Pseudofossil? Link to comment Share on other sites More sharing options...
jeepinthemud Posted July 19, 2009 Share Posted July 19, 2009 to me, this looks more like the pattern in the rock.. if you look below the main line, you can see a very small section similar to the big line... It looks like that is just what the rock is... is the rock limestone? "To do is to be." -Socrates "People are Stupid." -Wizard's First Rule "Happiness is a warm Jeep." -Auspex Link to comment Share on other sites More sharing options...
Ron E. Posted July 19, 2009 Author Share Posted July 19, 2009 to me, this looks more like the pattern in the rock..if you look below the main line, you can see a very small section similar to the big line... It looks like that is just what the rock is... is the rock limestone? Yep, and unique. I've seen lots of limestone around here, nothing like this. Link to comment Share on other sites More sharing options...
jeepinthemud Posted July 19, 2009 Share Posted July 19, 2009 It looks very familiar to me... im getting out my books! "To do is to be." -Socrates "People are Stupid." -Wizard's First Rule "Happiness is a warm Jeep." -Auspex Link to comment Share on other sites More sharing options...
jeepinthemud Posted July 19, 2009 Share Posted July 19, 2009 Hmm... the left side of the rock looks more crystalline than the right side... perhaps it could be a type of coral? (though ive never seen any coral like this).. im just trying to figure out how those lines were formed... because each line connects with a little bump on the surface... and the entire surface has those, so the entire rock (at least the right half) should be composed of this... it looks very much like the basalt formations, but its certainly not dark enough and you said it was limestone... hmmm "To do is to be." -Socrates "People are Stupid." -Wizard's First Rule "Happiness is a warm Jeep." -Auspex Link to comment Share on other sites More sharing options...
Ron E. Posted July 19, 2009 Author Share Posted July 19, 2009 im just trying to figure out how those lines were formed... because each line connects with a little bump on the surface... and the entire surface has those, so the entire rock (at least the right half) should be composed of this... it looks very much like the basalt formations, but its certainly not dark enough and you said it was limestone... hmmm We have sandstone structures in NWA south of Fayetteville that resemble miniature Devil's Towers (36" wide or so, a few inches tall, coming right out of the ground), but they are made of good old sedimentary sandstone. Nothing to do with this particular specimen, but interesting, nonetheless. Link to comment Share on other sites More sharing options...
Stacey Posted July 19, 2009 Share Posted July 19, 2009 A fossilized UPC code? Seriously, whatever it is, it's unique. Link to comment Share on other sites More sharing options...
Auspex Posted July 19, 2009 Share Posted July 19, 2009 Possibly a little gypsum influence? "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
fossisle Posted July 19, 2009 Share Posted July 19, 2009 We find similar cross sections here in the Cretaceous on Vancouver Island and it is the shell of a large Inoceramid. Cephalopods rule!! Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted July 20, 2009 Share Posted July 20, 2009 It kind of looks like a styolites(dissolution structure), but I have never seen them in those lengths. Link to comment Share on other sites More sharing options...
jeepinthemud Posted July 20, 2009 Share Posted July 20, 2009 its the entire rock, not just a single line... that is what is throwing me off. haha. auspex... ive never seen gypsum do that. haha. then again... it has done some pretty weird things... "To do is to be." -Socrates "People are Stupid." -Wizard's First Rule "Happiness is a warm Jeep." -Auspex Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted July 20, 2009 Share Posted July 20, 2009 ^^Then it is probably styolites. Link to comment Share on other sites More sharing options...
Crinoid Queen Posted July 20, 2009 Share Posted July 20, 2009 Boone Limestone, early Missisippian: That third image is super hi-res, don't download unless you're on a fast connection. Rock is 10" x 7". Each little groove is a tad less than a millimeter. Coral? Pseudofossil? I think it looks like a coral to me. I am not shur of the speicies but i find ones like this all the time. When you view then from the sides it looks like yours does. Link to comment Share on other sites More sharing options...
tracer Posted July 20, 2009 Share Posted July 20, 2009 slickenside Link to comment Share on other sites More sharing options...
jpbowden Posted July 20, 2009 Share Posted July 20, 2009 slickenside Amen Brother......... Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted July 20, 2009 Share Posted July 20, 2009 Not slickenside, where would the movement come from. The area below the elongated structures show classic styolites surfaces. Link to comment Share on other sites More sharing options...
Dave Bowen Posted July 20, 2009 Share Posted July 20, 2009 I see this pattern often in the Austin chalk formations. Mostly when I see it, it's from a thick shelled clam found here that has had the shell replaced with striated calcium deposits. Perhaps this is an imprint from one of these? Dave Bowen Collin County, Texas. Paleontology: The next best thing to time travel. Link to comment Share on other sites More sharing options...
Terry Dactyll Posted July 20, 2009 Share Posted July 20, 2009 Pardon my 'basic ' understanding of Geological terms.... I think its a natural fissure that has formed and has allowed the formation of a crystal structure made from dissolved elements contained in the rock itself.... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
jpbowden Posted July 20, 2009 Share Posted July 20, 2009 slickenside more This is very common in Texas, Hyway 35 going into Bell County from the south has some and over in Killeen also. You may also find these forming in clay here, mainly when Calcite fills in the cracks. Common in the Garyson Formation again along 35. What am I talking about, I had to clean the stuff out of my water heater once a month when living there! Link to comment Share on other sites More sharing options...
Ron E. Posted July 20, 2009 Author Share Posted July 20, 2009 slickensidemore This is very common in Texas, Hyway 35 going into Bell County from the south has some and over in Killeen also. You may also find these forming in clay here, mainly when Calcite fills in the cracks. Common in the Garyson Formation again along 35. What am I talking about, I had to clean the stuff out of my water heater once a month when living there! As I understand it, this forms along a single fissure? This rock is entirely composed of these parallel structures, sort of like a big honeycomb. Glad the experts are as stumped as I! Now I feel a little less dumb Link to comment Share on other sites More sharing options...
geodan03 Posted July 20, 2009 Share Posted July 20, 2009 They are slickensides or calcite crystal growth within the limestones. I see them alot in the limestone of my area. On a previous post of mine i uploaded similar pictures of this kind of limestone. They are not fossils, but still very interesting. Link to comment Share on other sites More sharing options...
grandpa Posted July 20, 2009 Share Posted July 20, 2009 Looks like vertosol = "Clay soils with shrink-swell properties that exhibit strong cracking when dry and at depth have slickensides and/or lenticular structural aggregates. " A slickenside in this usage is "a surface of the cracks produced in soils containing a high proportion of swelling clays", i.e. a vertosol. In other words: Yea, what JB and them said. Link to comment Share on other sites More sharing options...
jpbowden Posted July 20, 2009 Share Posted July 20, 2009 As I understand it, this forms along a single fissure?This rock is entirely composed of these parallel structures, sort of like a big honeycomb. Glad the experts are as stumped as I! Now I feel a little less dumb Experts? It's not that hard to understand, just follow the construction companies building the road systems here in Central Texas and and you figure it out. Link to comment Share on other sites More sharing options...
tracer Posted July 20, 2009 Share Posted July 20, 2009 if you look carefully, "zoomed in", at the third hi-res picture, you will note that the "bottoms" of the striations look faint as if the impressions are just beginning, and the top of the striations look deeper and "gouged" into the rock, with little lips of material that were pushed outward. to me this is indicative that there was pressure against the rock in question as it slipped downward or the rock pressing against it slipped upward. carefully examined, i see every reason to believe the impressions were mechanically created and no reason to believe that they were organically or chemically created. Link to comment Share on other sites More sharing options...
Frank Menser Posted July 20, 2009 Share Posted July 20, 2009 its the entire rock, not just a single line... that is what is throwing me off. haha.auspex... ive never seen gypsum do that. haha. then again... it has done some pretty weird things... In S. Florida we occasionally run into Gypsum seams- lines of needlike xls that look similar to that. on the specimen below you can see that (in real life) by looking at the edge (unfortunately, my camera doesn't do well on things this small). Be true to the reality you create. Link to comment Share on other sites More sharing options...
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