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Showing results for tags 'mold'.
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A few days ago I found a nice internal & external mold of a rare Arctinurus sp. This is something I've been looking for over 5 years. I was beginning to give up hope having never even found a pygidium in these rocks. Anyway, I decided it would be good to make some internal/external latex casts and molds and show progress here since I haven't seen much on this topic. I am doing this to observe any differences in the internal/external shells since with this type of preservation the skeletal shells have been dissolved during dolomitic diagenesis. The outer shells could possibly exhibit different features not observable in the internal molds ie. taphonomic or morphological, etc. From making comparisons, I don't think it is A. occidentalis as the anterior border projection is not as pronounced. A. nereus more pustulose and lacks anterior tongue. It more closely resembles A. boltoni but I don't think is reported from this area. So, I guess it is unknown...for now unless @piranha can identify it. First cleaned up with scribe and carefully removed the "tongue" from matrix and superglued in place. This appears to be very easy but actually took many hours. Also not shown is the more complicated prep of the external mold which had to be broken into three pieces and trimmed with a tile saw and then glued together. Set overnight. Aside from the Arctinurus, I also am making latex casts/molds of Dalmanites platycaudatus and a Glyptambon verrucosus cephalon. I don't have a lot of external trilobite molds as they usually break apart and lost in the field. This is also my first attempt at making internal latex molds from externals using hydrocal. I have made latex casts from internals with plaster of Paris but with mixed results as it is softer and more easily broken. For these I want high fidelity examples. Also, I am just winging it. Here, applying a very thin first layer of latex to the external Arctinurus mold. The first 4 or 5 layers need to be very thin and dry between applications. I decided to attach the cephalon /pygidium to the dalmanites with clay and aluminum foil to hold both parts together. to be continued...
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Identification help requested! In presumable Burlington chert (Mississippian: Tournaisian/Osagean) of east-central Missouri (Lincoln County), USA, I recently came across a mostly moldic chert specimen of what must be a bryozoan, but I do not know what early Mississippian bryozoan would possess such a robust axis devoid of zoœcia, as in the later Mississippian Lyropora. At first I was not even sure it was the bryozoan’s own axis but instead thought the bryozoan was somehow associated with an orthoconic cephalopod. Each photo below is paired with its optical inversion to help visualize what originally filled the mold. Scales in mm. The main reason I feel confident that this whole structure is bryozoan is thanks to a colleague’s find of a presumably related unidentified bryozoan, also in moldic chert presumably from the Burlington Formation but from southwest Missouri, that shows the axis and its texture much more clearly than mine. Here is that specimen, again with inversions. Again I have no knowledge of an early Mississippian bryozoan built like this. (Yes, the axis surface texture looks quite a bit like the texture along the genal rim of some Mississippian trilobites! But it also resembles undoubted bryozoan textures I’ve seen.) Identification help requested! Thanks.
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- bryozoa
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Below is a small fossil that I think may have some mold on it. Is it actually mold, and if it is, how do I address this?
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Hello, I found this imprint/mold of what I think is a plant. It was found in France in a dry part of the river Gap. The rock is fragile, I can break it with my hands. Curious to find out your opinions!
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I wish this was a post to celebrate an incredible accomplishment but instead I am extremely scared that through my potential carelessness, the likely greatest find of my life may be forever changed. I just a few days ago on 6/6 found this stingray fossil at American Fossil Quarry in Wyoming just and was able to keep it because it was at that location. I have been on a road trip and have been storing it in a plastic tote bin with bubble wrap and then fish fossils underneath wrapped in paper towel. I took the lid off for a prolonged period to air out the bin and I think this was a grave mistake and let in humidity. The paper towel was all heavily damp and many of the fish fossils had very obvious signs of mold/mildew growth and discoloration. And now I fear the stingray may show some as well. I desperately need advice on repair and preservation asap. I really need help trying to fix this mess as I’m still on the road for another week. It may not be super obvious in the images but it is the areas that appear a grayish color in contrast to the orangeish brown. The last image is the closest picture I took on the day it was found to show any potential change. This was a lifetime find and I will be crushed if I’ve caused irreparable damage. Please help. Any advice in repair and preservation is greatly appreciated. And I’m sorry to all those that see this and are disappointed in the poor handling of this rare piece, I’m more than disappointed in myself if things are what they seem. And if by a miracle the stingray is perfectly fine then any advice on the fish fossils would be great.
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Hello all! Been a bit since I posted last! I've more than a few trips since then but I thought I would start posting more on the website and less on "facebook." In April, I was granted a trip to two quarry sites in Indiana where I live. Normally, these sites offer myself and several of my friends access 2-3 times a year. While at the second quarry site and finding nothing I was getting irritated and slammed my 3lb hammer into the quarry floor. What came up was a cephalopod that I have yet to find in great condition. Dawsonoceras! I did the best prep I could with my pneumatic drill but an air scribe would have helped to make a better presentation. I hope you enjoy! More to come from some of my adventures!!!! Steve
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So, from the same road-cut, same layer as the object I just posted. Figure 1 is the "dorsal" surface, Figure 2 is the narrowed end through matrix. This one is better preserved to the point I can see circumferential "channels" in the margin (white arrows) and two lateral edges or "alae"? (A and B ) (Figure 3). Question-do you think it would be of any benefit to lift off the layer depicted? (Blue arrow in Figure 4). How would/could I even clean away all the other matrix? What are the "channels"?, So many questions!!....Cool eh? Thanks again and my apologies for hogging the forum! Bone
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I have a large piece of soft limestone from Lake Texoma. It contains an external mold of both a large and small ammonites. These are the first cephalopods I've ever found, and I'd like to preserve them. Any suggestions?
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I found this piece while looking through a kilo of Amber and it's a bit different to the usual - there is something distinctly fibrous inside. Usually its the internal patterns of the Amber but this isn't. Unfortunately, its super hard to photograph. I think its probably something like mold or pollen, although I can't see any distinct seed pods etc - going to clean it up a little more tomorrow. I'd appreciate any input. Thanks, John
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Worked out of a very larger piece of material. The same that surrounds it's bottom half. Excavated from backfill dirt used in building a farmhouse approx 1800 in Bleckley co. Ga. U.S.A. The actual mold is 100% some type crystallized formation or fossil. Curious on what it actually is and how old it is. Thank you for any help!
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- central ga.
- complete
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I need to make some molds, best (cheap) source of molding material?
OregonFossil posted a topic in Fossil Preparation
Mostly small fossils (think less than 20mm, many 2 to 3 mm). Maybe a pound or two. Brands on Amazon, other sources? The molds would be used to photograph for fine internal and external detail from casts. I am clueless when it comes to this. -
Which would you prefer to find a mold or a cast?
OregonFossil posted a topic in General Fossil Discussion
Which do you prefer to Mold or Cast - Why? Secondary question is have you ever used a vice to break shale or sandstone? I started do this and seem to get good results. -
I went camping today. ok, not really camping. just picnicking at a campsite in the woods. we didn't stay over night because it is far too cold. so I found this rock with these cool indentions and want to know what it is. at first I thought it was by a tool but it's not. thanks, dorky
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During my "trek" the past couple days I cam across this very large "mold" and the closest I can i.d. is Pteronites sp?. It is from this rock outcropping in Kansas City (Figure 1 the solid "blue-ish" stone band in the middle of the picture) Is this reasonable?. It appears to have an "edge" to it? and is very large-I would guess the whole thing would be close to a foot long? Pretty cool-almost took my breath away when found from the sheer size. Thanks for any thoughts! Bone.
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It has it all around it an on the ends this one was mostly covered. It might be 2” long an half inch tall on ends an almost a inch tall at tallest point for size. Some shell it looks. I found it in my aunts flowerbeds she had bought rock in 1969 to cover 7 beds. So when I weeded them I'd dig out interesting ones. She's had the same rocks since then. She'd have the rocks cleaned an put back . Kodak, TN. I thought it was the most interesting one. Thought to share. Thank you.
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Hello everyone! A friend of mine was just given a group of fossils from a relative and has very little/no info on them. Through searching through this forum, we were able to I.D. most of the pieces, but this one we were unable to recognize and were hoping someone could help. There is no locality information associated with it unfortunately. Thank you everyone for your time/help, I really appreciate it!
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- invertebrate
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Hello all. I am interested if anyone else is having problems with the new, snap close, mini-display cases. I am also wondering if the residue also damages the fossils. I've removed all of my small fossils from these cases until I hear more from the forum.
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- damaged
- fossil damage?
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Here's a strange one. I found plentiful piles of what I thought were casts and internal molds in the iron-rich St. Mary's clay of Virginia last year. Loose clam fossils riddled blocks of talus. I was able to wiggle some out of their ancient resting places without s much as scratching the matrix. Generally that's because the shell disintegrated, leaving a void between the mold and the cast. If you look closely, however, what looks here like an internal mold isn't. The sculpture on the surface is clearly the outside of the shell. If it were the inside, you would see round protrusions where the ligament attached to a depression in the shell, not concentric ridges. Shown here is the most distinct of my specimens, but not the only one. Any thoughts? Mercenaria campechiensis, Miocene, VIrginia
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- calvert group
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hello, I found this egg mold close to my house, there were an excavation, i found it in the dirt they bulldozed away. (it wasn't broken when i first found it, it fell by mistake). from the other side it's just a normal orange-ish sedimentary stone(i don't have enough media MBs left). And, I see these orange lines in the bottom of the stone too often on other stones i want to know what they are. thank you.
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These are all in the same stone. Wondering if it's 3 different preservation types of the same species. Found in Sw fl, in the sand. Trying to learn to recognize familiar players in their various forms and stages of erosion. Couldn't get the tape measure next to two of them, but they're both 2.5 inches long on the nose. The one that looks like a unicorn horn(w/ tape measure) was what caught my eye, rimmed with grass it really stood out! Its shimmery and beautiful. Is it ok to chip it out? Far from its margins, of course. 3rd pic following...
- 23 replies
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- florida
- gastropod?
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I found these in the creek back in September, this is the only pic I took (just now happened upon it in my files) and I can't find them to retake pics. The largest rock, the black one in the right of the frame, is no bigger than 2" at it's widest measurement, if that helps. I'm just really curious about what would make these little bubble-like formations printed on a rock like this. Bubbles?
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- bubbles
- bucks county
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