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Showing results for tags 'concretions'.
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Tarrant Formation Concretions, Middle Cenomanian, North Texas
Heteromorph posted a topic in Fossil Hunting Trips
In November 2018 I found a site in the Middle Cenomanian Tarrant Formation. Parts of the site were in the Lewisville member of the Woodbine. In the Lewisville I only found a few common bivalves, but the Tarrant produced multiple large concretions packed with ammonites, plant material, fish bones, and some unknowns. Some of the largest concretions were about 2 meters by 2 meters by 2/3 meter thick. But of course sizes and shapes varied. The concretions were a bit crunchy on their weathered exteriors, but in their blue interior they were harder than concrete. Lots of weathered ammonites covering the concretions, but when broken open the concretions' blue showed how well the ammonites inside were preserved. Their shells had been replaced with (I think?) calcite, so they were nicely shiny. Most of the ammonites seemed to be Acanthoceras amphibolum and Tarrantoceras sp. On March 1, 2020 I got a trailer and bobcat to, with the landowner's permission, haul a few giant concretions home. I did, and they are sitting in my barn. It would take years of preparation for one person, but there are probably some cool things in them. I hauled off around 2 tonnes of concretions, at least. Here are some pictures, spanning November 2018 to March 1, 2020. November 2018. FIG. 1-2: Concretion size. FIG. 3: Fossil wood. FIG. 4-7: Fossil hash. FIG. 8: Dog for scale. May 2019. FIG. 9: More hash. FIG. 10: Too much to carry... May/June 2019: Close-ups at home. FIG. 11-13: Same rock with close-up on wood with boreholes. FIG. 14: Ammonites and fish-bits hash. FIG. 15-16: Two different rocks. FIG. 17: Plant material. March 1, 2020. FIG. 18: The haul home.
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- acanthoceras amphibolum
- concretions
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The Devonian Gogo Formation Lagerstätte: a view of Australia's first great barrier reef
Oxytropidoceras posted a topic in Fossil News
Great open access paper about the Devonian Gogo Formation Lagerstätte, Canning Basin, West Australia. Trinajstic, K., Briggs, D.E. and Long, J.A., 2021. The Gogo Formation Lagerstätte: a view of Australia's first great barrier reef. Journal of the Geological Society. Yours, Paul H.-
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- australia
- canning basin
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I found about thirty of these specimens partially eroded out and partially buried approximately 100-200 ft above the Owyhee River in the Upper Great Basin Desert of Eastern Oregon. I would appreciate any identification suggestions. Thank you
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Hi everybody. I remember seeing a thread about fossils coming from New Zealand and in it was a paper about legality and such. Does anyone know how I can find that? I tried the internet but all I got was confusion. any help would be much appreciated. Thank you RB
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Another Trip to the Cannonball Formation (sharks, fish, and crabs)
Thomas.Dodson posted a topic in Fossil Hunting Trips
I was eager to get out before the heatwave coming up so I made the visit to a couple new Cannonball sites the other day as well as property adjacent to where I collected the crabs this spring. I was expecting more good bivalve material from the first sites but I'm pretty happy with the results regardless. Sort of a continuation of this topic. I tried a few cuts before working my way down to the area I found the concretions in before. The material in all was extremely fragmented. I still need to bust that concretion. One of the inconspicuous cuts. More fragments. A worn Ophiomorpha? I did find a worn Carcharias taurus tooth at this site which made it worth the stop. Down in the familiar area I had immediate luck as the first concretion I busted had a shark tooth. It broke the tooth but the break is clean and should made for an easy repair. Here's a crab (Camarocarcinus arnesoni) that was already split. This is the only split concretion I saw that contained a fossil. The white material obscures it a bit but the last one I prepped like this had the normal black color and carapace texture once I abraded away the white. This should clean up pretty nicely. An example of a concretion. Prickly pears, purple prairie coneflower, and prairie roses were all in bloom as well. Concretions show variety in color, texture, and shape but there doesn't appear to be a correlation with any of these characteristics and which ones contain fossils. The ratio of fossils to blanks was higher than last time but still not enough to warrant preparing the concretions directly. Got to split them all first and glue them back together as necessary. These two were blanks. This pretty one was not. Tiny (5 mm) fish vert. Hard to see but the faint outline is probably a crab. Otodus obliquus, a new species for me. A gnarly piece of petrified wood, probably float material from somewhere. Common Nighthawk eggs I believe.
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- cannonball formation
- concretions
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Hi guys, Brand new to the forum, but excited to be here. I found this in an area where water used to be very high all around me. In fact in a great deal of Thornton Co. In this case I am around the Niver trail. I am not so much the expert in geological terms so I will forego the effort in outlining this, but I will say the rocks around are very interesting. A lot of petrified wood, some form of molten rocks and evidence of extreme heat, has made for some interesting mineralization many of my finds. I look forward to your advice and have much more to show and hopefully learn from your feedback. Thanks for looking
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This came from Eagle Ford Kef creek, I have collected odd burrows but this one appears to have things in it. Anyone recognize anything? Can there be concretions inside a burrow? Pictures show wet and dry.
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Just saying hello and letting folks know I am new to the forum.
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Hello again! Hope everyone is having a fossiliferous holiday. I found this split concretion yesterday with some organic looking form peeking out from inside. Take a look: No idea. Nothing recognizable except that hole. Found this at the same site, those long and narrow shells might have been what was stuck in there? What do you think? Nothing and it's just gobs of clay?? Let me know if you have any thoughts and as usual, thank you so much for your time and consideration.
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I've always been really into fossils and prehistoric stuff but I only recently starting going out and fossil hunting. On a recent trip I found 5 concretions from the lincoln creek formation in washington state. I'm pretty sure only the middle one has something in it but I'm at a complete loss at how to go about cleaning these. I dont have a air scribe and I'm completely content with just seeing some of the crab, if there is one inside any of the concretions, and would love some pointers to go about this. Also how to preserve them once they are exposed. I've seen people using some chemicals but would love a specific brand to use!
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Tiny items, 1/2 - 1/4 inches, picked up in Big Brook that caught my attention and warranted being brought home. Teeth? Bivalves? Concretions? As always thank you for sharing your expertise
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Today I had the pleasure of attending I & M Canal Corridor Trip to collect on the "actual" Mazon Creek (River) in Morris, Illinois. I believe that this is the 11th year for this trip, which is held on Saturday and Sunday on a 400 acre farm that has access to the river. This is the first time that I have participated in this trip and thanks must go out to Rich @stats for letting me know about this trip last year. In January of this year Rich contacted me again to let me know that the sign-up for the trip was on line, so on 1-6-20 I sent my payment of $150.00 in and reserved my space. Some of you may question the $150.00 payment for this trip when you can collect out at the pits. First off, the money goes to support the I & M Canal and at the end of the day there are drinks, hors d'oeuvres and then dinner, which includes steak, chicken or pork chops, plus vegetables, corn on the cob and dessert. (Social Distancing was in place). We all met around 12:30 pm and the lecture started around 1:15 pm. The collecting started around 2:20 pm and we collected until 5 pm, which was plenty of time. When we arrived back we had dinner and sat around to talk until about 8 pm and then I headed out for the 1 hour drive home. Prior to the collecting portion, there is a nice informative talk given on the history of Mazon Creek fossils, what to look for and also some displays so the participants can visualize what they are looking for and what they might find. There were also a number of Fossil Forum members present and I will let Rich tag those members since I forgot their Forum names. I will start off with a few pictures of the pre-collecting time of trip. There were 3 dogs that were running around the property and I could not stop petting them. Some pics of us driving to the collecting site- The walkway to the river. Here are some pictures of the creek area. Continued on next post.
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Concretions of Bowling Ball Beach, Schooner Gulch State Beach, Mendocino Coast, California
Oxytropidoceras posted a topic in Geology
Bowling Ball Beach, Schooner Gulch State Beach Sea Ranch, Rocks of the Gualala Basin Sea Ranch, Regional Geology Guidebook to Bowling Ball Beach Region, PDF file Guide to Concretions and Bowling Ball Beach, PDF file Guide to Bowling Ball Beach, Archive PDF file Schooner Gulch State Beach, Mendocino Coast, California Atlas Obscura, Concretions and Bowling Ball Beach Duraj, M., Niemiec, D., Marschalko, M. and Yilmaz, I., 2016, October. Listing a geological rarity of 'Stone Balls' in Kysuce among world geotourism destinations. IOP Conference Series: Earth and Environmental Science (Vol. 44, No. 3, p. 032013). Yours, Paul H. -
From my previous trip to Ellsworth County, Kansas and it's located in Dakota formation, Cenomanian. It appeared as almost like vertebrae but I'm sure it's not verts. Is it by chance some form of ichnofossil? @jpc thinks it's concretionary. No disrespect to him, he's the only one who offered his opinion and I would like to know if anyone else have a different opinion.
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Fossil-bearing concretion formation over week-month timescales
Oxytropidoceras posted a topic in Fossil News
Yoshida, H., Ujihara, A., Minami, M., Asahara, Y., Katsuta, N., Yamamoto, K., Sirono, S.I., Maruyama, I., Nishimoto, S. and Metcalfe, R., 2015. Early post- mortem formation of carbonate concretions around tusk-shells over week-month timescales. Scientific reports, 5, no. 14123. Open access Nagoya University PDF link Researchgate PDF link More papers by Ippei Maruyama More papers by Hidekazu Yoshida Related papers are: Yoshida, H., Yamamoto, K., Minami, M., Katsuta, N., Sin-ichi, S. and Metcalfe, R., 2018. Generalized conditions of spherical carbonate concretion formation around decaying organic matter in early diagenesis. Scientific reports, 8(1), pp.1-10. Open access Another PDF link for paper Researchgate PDF link More papers by Hidekazu Yoshida Yoshida, H., Asahara, Y., Yamamoto, K., Katsuta, N., Minami, M. and Metcalfe, R., 2019. 87 Sr/86 Sr age determination by rapidly formed spherical carbonate concretions. Scientific reports, 9(1), pp.1-7. Open access Researchgate PDF link Publisher Correction More papers by Hidekazu Yoshida Yours, Paul H.- 2 replies
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- carbonate concretions
- concretions
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Hello. I was just curious about what some good techniques for artificially weathering a concretion to get them open are? I've read that the best way to go is to soak, freeze, thaw, and repeat. But none of the sources I've read describes how long that takes. I'm sure it varies from specimen to specimen but is this process weeks, months or years? Does anyone have any other methods or resources about the process? I was thinking of giving it a try and could use some more information on the process. It seems kind of like the old geode gamble in a way. There's no way of knowing what's inside unless it's partially exposed already. I don't have a geologist's hammer and I think I'd feel bad if I cracked one by hitting it too hard or at the wrong angle. Are there any other tools that are recommended?
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Hi All, I'm new to the forum and I have no paleontology experience other than a class from undergrad 20 something years ago. My background is structural geology, hence my post here in hopes that I may confirm my suspicion as to the genesis of the specimens in the attached pictures. First a little background: I was in the field yesterday doing some reconnaissance work in east-central Wyoming. The land owners whose property I was on are multi-generational ranchers and they were extremely welcoming and enthusiastic about the geology of the area, despite having limited knowledge. At the end of the day, standing in their yard saying thank you's and goodbye's one of the college-age sons came running up with 2 specimens of what I presume to be concretions. However, the texture was smoother than other concretions I have seen and there was a dimpled character to the extremity of both which I found odd. The kicker is that the southern end of their property has a full section of Jurassic Morrison Fm exposed. When I asked what the rock looked like in the area that he found them, his description matched what could be interpreted as the variegated sands and shales of the Morrison Fm. Of course, it could also describer some of the Miocene sediments unconformably overlying the Cloverly Fm in the area as well. Regarding the photographs attached: I did not take the specimens with me, only the photos attached with my phone in the land owner's front yard. Therefore I do not have scale other than to say the index finger of my left hand is 9.5 cm and my left thumb is 7 cm from tip to base knuckle. Any help would be greatly appreciated as I told the landowner's son I'd be happy to do a little research on his behalf. Much thanks in advance! -WyoOtto
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Anyone out there have any Tully Monsters they would be willing to trade. Partials ok. PM if you want.
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Good afternoon folks. I am wondering if anyone in our group has a "collection" of mislabeled concretions. If so, post them here it may help others identify some of their unknowns.
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- concretions
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I found these concretions a couple of days ago. I'm not sure if the small hollow concretions were formed in the same way as the larger ones but they were within about 50 feet of each other. The small hollow concretions shown were up to ping-pong ball in size. The larger ones are shown with a scale. Found in northwestern New Mexico, San Juan Basin, Upper Cretaceous, Kirtland Formation.
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Hey guys, I braved the creek yesterday on the first day of hunting season at Mazon. It was a thrilling first time getting to hunt there. These of the surface finds were pretty interesting looking and were among many duds, so I'm wondering if anyone has any ideas as to their classifications. The rest of the lot is in the freezer so look for my thread on that in a bit More concretions in the following posts: Thanks for looking!
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Colorado Fossils Show How Mammals Raced to Fill Dinosaurs’ Void
Oxytropidoceras posted a topic in Fossil News
Colorado Fossils Show How Mammals Raced to Fill Dinosaurs’ Void An unusually rich trove found in Colorado reveals the world in which our mammalian forebears evolved into larger creatures. https://www.nytimes.com/2019/10/24/science/fossils-mammals-dinosaurs-colorado.html Fossil trove shows life's fast recovery after big extinction by Malcolm Ritter, PhysOrg. October 24, 2019 https://phys.org/news/2019-10-fossil-trove-life-fast-recovery.html Yours, Paul H.- 2 replies
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- carsioptychus
- colorado springs
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From the album: 1925 Body & Trace Fossil Collection - Ocean
This is the only crab I have in the collection however small it may be -
From the album: 1925 Body & Trace Fossil Collection - Ocean
This is the only crab I have in the collection however small it may be -
From the album: 1925 Body & Trace Fossil Collection - Ocean
This is the only crab I have in the collection however small it may be
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