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Showing results for tags 'Sedimentary'.
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I was walking around the other day and found some rock that resembled slate but was full of some black specks. Can someone tell me if the specks were originally mineral deposits or perhaps more organic in origin? There is quite a lot of this rock in the valley I was in.
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A short while ago I posted similar pictures of what I think is a talon print. Someone asked what type of stone it was in so I posted pictures. I found this in Clearfield county PA.
- 13 replies
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- pennsylvania
- talon print
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I had a quick question about mudstone. Is mudstone fissile and akin to shale, or is it more "clumpy/grainy" like sandstone? I've always had difficulty understanding the difference between sandstone, siltstone, mudstone, and shale. Thanks!
- 5 replies
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- sedimentary
- mudstone
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Seaview , WA. Found deep in dirt by my dog Cleaned it up and used textured file to get debris from around bone. It’s not an arrowhead. Enjoy Maybe?
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- fossil
- neanderthal
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I was looking around marsh quarry, Colorado and I found this. It looks like a bone fragment. It has a really black color seems like it consists of ash and it also shows traces of hollow bone.
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- black
- sedimentary
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By looking at this image where, in your opinions, is best to start fossil hunting? The base of the Sierra de Los Filabres was the Iberian coastline until around 8 million years ago when the rest emerged from the sea. We live 15 minutes from Almeria on the coast and have a fascination with sealife. As this sedimentary area was under the ancient sea, it would seem a good large region, minus any protected areas of course, to make a start. Opinions from your knowledge or experience is appreciated.
- 3 replies
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- sedimentary
- near or far
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Hi all, I found this specimen from a rotary borehole (window sample) at 5.4mbgl within the upper Whitby Mudstone Formation. I’m leaning towards a shell eating fish, but still unsure from the shape of the rest of the the samples which looks more like a coral? The site location is Dundry, Bristol, England. Reported geology: Whitby Mudstone formation Palaeoenvironment: Shallow marine environment Reported age: 174 -183 million years old Any suggestions would be greatly appreciated! Regards Reinier
- 5 replies
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- whitby mudstone formation
- uk
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I found this rock in a area not logged in any geological map except one French map from 1963 which logged it as Cretaceous with a question mark. It is surrounded by Precambrian mountains and sedimentary rocks just randomly pop out so I thought I should investigate. Near Makkah Saudi Arabia. I found volcanic, Precambrian and sedimentary rocks there which confused me . Anyways I was wondering if this is a fossil and if it is the. What type
- 2 replies
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- cretaceous
- sedimentary
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Hello! Please help me find out if the arched bands showing up after polishing this metamorphic rock are just random artifacts of sedimentation or an indication for petrified wood? The material reacts to vinegar. I picked the stone in Romania, Harghita county. Thank you!
- 7 replies
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- petrified wood
- metamorphic rock
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Hello! Here are several photos of a fossilized colony of some sort of worm, or so it appears to me. Please excuse the remnants of clear nail polish I used years ago to increase contrast before I knew better. I came across this in Santa Paula canyon about 2 miles northwest of highway 150 where it turns west at Thomas Aquinas College, Santa Paula, CA. It had washed down decades ago from probably a Matilija Formation exposure. The matrix grain seems quite fine and the rock is very heavy. Although I've been up and down the creek countless times, I've never seen the source bed. Eocene oysters, clams and echinoderms have been collected in the canyon. Thanks for your help.
- 3 replies
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- juncal
- sedimentary
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Subject is a bit off topic, but while out exploring a local canyon for Ordovician fossils, I chanced upon this strange exfoliating section in a formation known as the Valmont. Would anyone happen to have knowledge on the processes behind this? The area was not conducive for finding fossils. This is 'as viewed' from the side. It is not taken from above. The bed is in a normal horizontal orientation but exposed in a staircase cleft. Sedimentary rock formation Found in the orange box in this photo
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- sacramento mountains
- ordovician
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- 4 replies
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- sedimentary
- fissilized
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Teeth? Or am toothbrushing rocks? Sand continues to shed and seem to be shaping. Hunt County. Bazaar Sedimentary rock. Only one I've seen like it. Looks like sea coral . Hunt County. I would have completely discounted this because of how white it is except for how it was found and how it looks.
- 2 replies
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- grayson marl
- sandstone
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Just moved 40 to the SE of Yellowstone National Park in NW Wyoming. We have been finding these in the excavation of the house. They are located in a greenish clay layer just above a rocky layer approximately 12 feet below the surface. They are sedimentary balls that, when broken open, have a smaller, more hard type of rock or maybe fossil inside. We find them in different sizes from 4-12 inches in diameter. Any help would be much appreciated. Edit - I believe they are rare double concretions.
- 4 replies
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- wyoming
- yellowstone
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New to geology, so excuse my paltry terminology. Description: Tubes, many branching, between 1-3cm in diameter, in places as thick as a forest root system, material very sandstone-y, surrounding material clay. from my research these seem like burrow casts of... worms? tetrapods? do burrow casts form in such abundance?
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Found what seems to be a tooth in the Big Sioux River just inside the border of Iowa. Hoping to figure out what it's from. It appears to have a sedimentary formed abscess on it which leads me to believe it may be older. It's about half an inch tall and roughly just as wide
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I have recently added this piece to my collection. Was sold to me as a Sedimentary Stromatolite from Bolivia. No further info given. I have looked online and in my book and can't match it to anything. Is this a genuine Stromotolite? - it wasn't too expensive, and it's quite attractive either way. Photo of both sides. Roughly 11cm square
- 5 replies
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- stromatolite
- bolivia
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New member here. You all have been most helpful so far, thanks. These requested possible fossil ID were collected from a drained lake bottom in western Wisconsin (Vernon County). It is not soft like sandstone. There are two different items. The longer item (#1A-D)is shown on all four sides. The shorter item(2A&B) is shown just front and back.
- 4 replies
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- stromatolite
- lake bottom
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From the album: FreeRuin's Finds
Marks left by the movement of a river or stream in the early Jurassic. Hartford Basin Portland Formation Massachusetts-
- asymmetrical
- ripple
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From the album: FreeRuin's Finds
Multiple cracks made from the drying of mud, probably near a seasonal body of water Hartford Basin Portland Formation Massachusetts-
- mud
- sedimentary
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From the album: FreeRuin's Finds
A mud crack preserved in the shale, I determined it not to be an ichnofossil due to more that turned up in the rock. Hartford Basin Portland Formation Massachusetts-
- mud
- enviroment
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