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Showing results for tags 'chert'.
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Hi! Is this a stromatolite? I picked up this rock on the premises of the Teleajen oil refinery in Prahova county, Romania. I have seen a chert wedge in a limestone boulder once upon a time, but this stone is different. It has layers of chert and carbonate, right? I grinded and polished the stone. Here is a close-up from the carbonatic area (fizzles with acid): Any idea how old are these rocks when found in S-E Europe? Thanks!
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An acquaintance found this on a ranch outside of Roscoe, TX. I presume it's some sort of fern. Any chance we could narrow it down further? It's a lovely specimen with a special remembrance for the collector. Appreciate any help you can offer.
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Hi everybody, I'm a neophyte to the geological realm (especially regarding paleontology), but I thought I'd share some finds on the forum. In Layman's terms, I found some clams, possibly some coral, and (...wait I know this one) Crinoids! Any possible fossil ID would be great, happy to be here, and glad to join a community with similar interests! All items below were found within 100-200 yards of each-other on the Meramec river just outside of St. Louis, Missouri. 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) 11) Artifacts:
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From the album: Missouri Bryozoans
One of my favorite finds due to how its almost complete and is in a very hardy rock I am assuming to be chert -
These come from limestone quarries in central Iowa, near Springville, which appear as crushed gravel for roadbeds. My sister picks these up on her walks and wonders if these are the result of volcanism, or fossils, or what? My friend and fellow fieldtripper Kent Budge gives the following explanation, but suggested that we post here to get the insights of real experts. “These are chert nodules that are formed by microscopic plankton called radiolarians, which are little microorganisms that pull silica out of sea water to make their shells, less than 1/16”. They can pull a lot of silica out of sea water and settle onto the sea floor when they die. Once they have settled onto the sea floor, they will dissolve again, unless there is an event that covers them up. If they get buried so that they are preserved, the radiolarians will dissolve slowly, but the silica takes as a more stable form of silica, and precipitates, forming nodules. A lot of chert, if you slice it up and look at it under a microscope, you can see the little skeletons. Sometimes you can see diatoms which also have silica shells, or glassy sponges. The reason these are formed into these neat clam-like or finger-like shapes is because they form in bedding planes on layers in the rock. There is some kind of nucleus, that they start from, which might be an organic fossil. It might also be from narrow channels in a bed that the chert pipes up from. “ Your thoughts?
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Hello everyone, I have not been on here in several years. Lately I have been running into some fossils out in the field and that got me thinking about the best forum on the internet. So I'm back, looking forward to contributing. My last find, Radiolarian chert, meta-morphed into a Meta-chert or Jasper.
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I found this in a creek in middle Tennessee. Is this part of a bone or is it chert? Or maybe it's something else completely. i see a circle on the inside of the tubular shape. there is also a less worn area that makes me think it is fossilized bone. I'm posting pictures with and without a louper. We have ordovician fossils as well as some ice age mammals. One dinosaur was found here, the hadrosaur. Birds, crocodiles, trees, i don't know about whales.
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Went out to a railcut that slices through upper Racine formation. This locality is only 10 minutes from my house. I almost never visit it because of scarcity of fossils, however I was reading a paper that mentioned forams in chert and decided to take another look. Here you can see the beds dipping gently to the east. This is interreef strata. Closeby is/was a huge reef, now filled with garbage. Here is a chert nodule to be sliced up. Also, found a silicified coral and packed in my bag. Disturbed this guys slumber. Silicified Favosites coral slice. Interesting to see sediment infilling. Microscope pics showing tabulae. These are just quick slices using a tile saw and submerged in water to bring out detail. Chert slices magnified. It appears to be echinoderm debris and possibly some coral spicules? (Correct me if I'm wrong about the spicules...) Columnal with spines. And finally, I believe this is a foram, the only one I could find. Difficult to photograph. Thanks for reading.
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Found this piece yesterday...unique piece of chert / flint...and....don't know??? Any thoughts??
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Strange shaped Chert nodule? Or native artifact? Natural or not? Found in creek.
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Had this in with my rocks for tumbling, now that I'm looking at it again I'm thinking it may be something. It came from Alluvial gravels in creek where I've found other artifacts. Trying to learn to recognize when something has been worked, think this has, and the edge is quite sharp.
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Found this guy today. Anyone know what it is. Found 25 miles northeast of Nashville. In chert with corral horns and crinoids.
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Hello, everyone, these fossils were collected from the basal Cambrian in South China, all of which are organic. But I do not know what are they? Does anyone can identify them. Please see the attachments! Many thanks.
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I found this on one of our mts in middle Tennessee. I'm concerned it may be bone and not chert like I had found later near my home.
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Is it typical to have such clean circular breaks in different areas of chert? Pictures 2&5
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I really almost dismissed it as a rock but second guessing. Could this be a shark tooth possibly? It was found along with crinoids and horn corals in a creek in Nashville area Tennessee
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What is the white plaster stuff on this chert?
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What causes certain pieces of chert to have a plastic look and texture after an acid test
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On this piece of chert it appears to have either an iron or copper coloring at the top but a green undertone at the bottom. On the second picture I’m assuming that was caused by erosion. What would create the green undertone coloring?
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San Antonio, Tx This rock came from the same area that other chert pieces came from in my back yard.
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does anyone see anything that resembles any kind of dermis of any kind in these photos
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Like in the title, I am unsure if this is even a fossil.
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Found this at the edge of a shallow stream bed that flies down from Smoky Mountain region in East Tennessee at Indian Boundary Lake near Tellico Plains Tennessee at edge if Cherokee National Forest. It measures 2" long, 1.75" at widest 1/2" deep at deepest. A bit more flat on one side. Cross section shows a thin outer layer. Outside look reminds me of wood but I don't know. Looks like photos too big so I will load another below.
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All of my pieces come from a creek on Crowley’s Ridge in northeast Arkansas near the Missouri border. Crowley’s Ridge is believed to be about 10,000 years old. Located as far north as New Madrid, Missouri and as far south as Wynne, Arkansas, it is believed by some to be a former bank of the Mississippi River. At some point, it may have even been an island. Some research has suggested that the ridge was affected by volcanic activity in the distant past. Today, Crowley’s Ridge is known for its gravel pits, uplifts, and bluffs which were likely caused by the New Madrid fault on which it sits. Our roads are covered with Crowley’s Ridge chert from the gravel pits. More practically-at least for me and my farming family-the ridge is partially covered with fertile, wind-blown “sandy loam.” We are rice farmers at the base of the ridge. I have explored the ridge since I was very young. The pieces I have collected were strange or out of place according to my limited perspective. I should also add that Crowley’s Ridge is Home to flora (plants) that are so far unknown to the Appalachian chain to its east and also unknown to the Ozark chain to its west. In this way, my little ridge is very unique. Memphis State University has done research on (Cretaceous?)sea fossils found in a creek bank near Wynne, Arkansas—-near the southern end of the ridge. I haven’t found those kinds of fossils in the area where I’ve explored. I learned most of the above information in a couple of upper level geography courses I had to take to fulfill my degree in Social Science. I don’t pretend to be an expert in fossils, minerals, or geology. I am here to learn about my “cool” rocks and clay.
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All of my pieces come from a creek on Crowley’s Ridge in northeast Arkansas near the Missouri border. Crowley’s Ridge is believed to be about 10,000 years old. Located as far north as New Madrid, Missouri and as far south as Wynne, Arkansas, it is believed by some to be a former bank of the Mississippi River. At some point, it may have even been an island. Some research has suggested that the ridge was affected by volcanic activity in the distant past. Today, Crowley’s Ridge is known for its gravel pits, uplifts, and bluffs which were likely caused by the New Madrid fault on which it sits. Our roads are covered with Crowley’s Ridge chert from the gravel pits. More practically-at least for me and my farming family-the ridge is partially covered with fertile, wind-blown “sandy loam.” We are rice farmers at the base of the ridge. I have explored the ridge since I was very young. The pieces I have collected were strange or out of place according to my limited perspective. I should also add that Crowley’s Ridge is Home to flora (plants) that are so far unknown to the Appalachian chain to its east and also unknown to the Ozark chain to its west. In this way, my little ridge is very unique. Memphis State University has done research on (Cretaceous?)sea fossils found in a creek bank near Wynne, Arkansas—-near the southern end of the ridge. I haven’t found those kinds of fossils in the area where I’ve explored. I learned most of the above information in a couple of upper level geography courses I had to take to fulfill my degree in Social Science. I don’t pretend to be an expert in fossils, minerals, or geology. I am here to learn about my “cool” rocks and clay.
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