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Showing results for 'Mold and Cast difference'.
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Hoooooooooooorrrrrrrrrrrraaaaaaayyyyyyyyyyy!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Here we are at last, into Adam's Silurian. Thanks for looking. First up is the Lower Silurian or Llandovery and I begin with a problem. I posted this one incorrectly in Adam's Ordovician as it had got it's label muddled up with an Ordovician Favosites I had that has vanished in the move here, but is being replaced by kind forum member @Herb Anyway, this, I remember now I've found the correct label, is from the greenish Browgill Formation, part of the Stockdale Group from a cutting near Skelgill (Skelghyll) in Cumbria, Northern England. It seems to be a tabulate coral, but I can't find any listed for this location, only mentions of small, rare, rugose corals. It has the star shaped corallites of a Heliolitidid, but seems to be tightly packed together like a Favositidid. A couple of species of Palaeofavosites seem to be close and are a bit star-shaped,, but anyone know any better? @TqB@piranha hmm who else? The coral bit, an external mold, is a maximum of 3.5 cm across and each corallite up to 2 mm.
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A Quick Trip to Green's Mill Run with a Few Surprise Finds (And a Very Brief Aurora, NC Visit)
Echinoid Express replied to Echinoid Express's topic in Fossil Hunting Trips
Thank you! I do enjoy the Squalicorax teeth, they're really interesting to me! I can't seem to find the much larger sizes of them there, they're dwarfed by the large ones I collect at Holden Beach, though I do find the smaller sizes at Holden as well. Speaking of Holden, I'm just about wrapped up with our family trip there, and I've got some exciting new fossils I found! I may wait a bit on sharing them though, as I have some additional collecting trips to other sites coming up next week, and I am waiting to hear back from an expert on some of the things I found this trip. I spoke to the gentleman who puts together the Virginia trip I've been going to where we find the Skolithos, and he thinks they are weathered clasts from the Cambrian mountain deposits as well, so I'm a little more comfortable labeling them as such for the time being. I was questioning it a bit due to the fact I've seen similar burrowing in the Peedee matrix chunks I've found at Holden, but the Cretaceous ones are either larger and in a less solid material, or something completely different altogether, which ties into my recent special finds. Next time I visit GMR I'll have to make a point of checking out the cobbles in the creek for more, it'd be nice to find some that have the three-dimensional mold condition. I do find them in Virginia that way occasionally, though it's less common than the eroded, "two-dimensional" ones. I haven't given up on Triassic stuff yet! I've befriended some swell folks in the area I live that may be able to assist me in my endeavors, so we'll see how it goes over time. I haven't forgotten to get in touch with the museums on that tooth either, though I'll admit I kind of delayed it a bit in order to have it be part pf a display of the Triassic fossils I did very recently! -
Is this coral? Feathery formation in limestone in Garland, TX
Rockwood replied to TalPal's topic in Fossil ID
I'm going to put a chip down on mold fossil of a plant or algae. -
A Quick Trip to Green's Mill Run with a Few Surprise Finds (And a Very Brief Aurora, NC Visit)
Andúril Flame of the West replied to Echinoid Express's topic in Fossil Hunting Trips
Congrats on the productive trips! Those Squalicorax have me . The Skolithos are particularly interesting and I enjoy running across them on occasion when hunting the Aquia of Maryland. I believe that you are correct and that these are weathered clasts that originated from Cambrian deposits farther inland. In my hunts I have encountered a number of interesting specimens including some that preserve the mold of the trace itself. Again, congratulations on your successful hunts and I look forward to seeing your future exploits into the Triassic!
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- belemnite
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Keichousaurus
Nathalie.D replied to Nathalie.D's topic in Is It Real? How to Recognize Fossil Fabrications
The seller told me that he bought it in China believing it was real, but then he asked people on the web for advice and was told that it was a total reproduction mold and bones, it was still very well done, I thought it was a real one, sorry for my English -
Keichousaurus
Randyw replied to Nathalie.D's topic in Is It Real? How to Recognize Fossil Fabrications
If that's the same as the casting I got then it's all reproduced... Most of the castings i've seen for sale or in person have been the same way... Quality normally varies from wow,! To yuck depending on the mold used and materials used to cast. -
Went traveling toward the eclipse, for a sister's birthday, and I am addicted to searching for treasures, especially beaches. This is Charles Island off of Trumbull Beach. The locals have introduced new clam beds just off shore Some of the clams leave the safety of the beds and end up on beach waiting for the sun and birds to intervene with a host of native seashells (razor clams, venus clams, moon snails, whelks) and evena few crab and jelly fish.. As far back as I can remember, I have tossed the live ones back into the temporary safety of the tidepools. Maybe I think of it as a little penitence for all those clams casino and oyster Rockefeller I have consumed. On my 1st walk, I tossed back in 117 clams and 3 oysters. When I was young, there used to be oyster bonanzas here, Occasionally, I would pick up a moon snail, or different type of shell There is always something new to find... a small spider crab and this whelk... I do not know the specific species along the Connecticut beaches and hope some TFF friends from the area might recognize it. I was interested because it was pretty and because the operculum had been "sliced" but still mostly there. I thought the likely culprit was a seagull but a little confused why the bird would not have eaten some or more of the exposed gastropod. On Monday I watched the Eclipse with the Birthday girl and tried to figure out how to snap a photo with my cellphone, having prepared no other equipment. I tried many times and I have a number of these shots, which I do not quite understand... basically focus at infinity and long exposure... I thought the blue arc is the actual eclipse and the ball of fire is some sort of reflection.. but I have not figured it out. When I looked thru the special glasses, the eclipse was always a dark (almost black) moon moving across a very bright sun. Fortunately , a niece and her significant other managed to get close to the Vermont_Canadian border and managed this shot in the line of totality. On the last morning, while tossing more of the live back into the tide pools, I saw this fantastically ornate clam.. Stepped back and thought what is that ??? It is 45 x 38 mm, and seems to be a little stand for a figurine of some other material. The figurine might be a doll or a leprechaun , The boots look look like ones leprechauns might wear and do not seem to be broken at the connection... I wish the flowers were 4 leaf clovers, but they are not... It seems like a resin or plastic poured into a mold, and is completely flat on the bottom. It seems more intricate and detailed than I would expect from a modern toy but who knows...? All comments and suggestions on what it might be greatly appreciated. I also saw lots of interesting overly worn rocks , but decided not to ask for identifications.... Jack
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From the album: Big Brook fossil preserve, Monmouth co. New Jersey
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I don’t have a clear answer but maybe food for thought... I know bleach works pretty well on algae and mold that grows on the siding of a house, but I have no experience with using it on fossils. Maybe try it on an inconspicuous area? I’ve heard of people using chemicals like CLR or Iron Out on mineral staining, but I doubt they would do much on something like algae or ground in dirt. Any idea what may have caused the staining?
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What is the tan material labeled 1? Could it be the sediment that filled the bivalve, AKA internal mold and steinkern? Is 1 shell material? Is 2 shell material which may be part of the other valve that is mostly gone? 3 might be a mold of a depression in the other shell. Please let us know what 1 or 2 are and if the fizz in acid.
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This mold seems large to be from a Crinoid stem. It’s almost 1 cm in diameter. But I can see faint horizontal lines that the camera is not picking up. Any help or guidance appreciated.
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the different structure is interesting, might be the mold of a sponge? Otherwise I follow the opinion of @Rockwood, could be only a concretion, too
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I bought this spiriferida some time ago and I got a question about it. How you can recognize if the fossil is the shell or the internal mold of the shell?
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Oh ok, well it doesn't appear to be bone at all. It may be an internal mold of something, but I have a feeling it is geologic in nature.
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Will a sponge texture paleosculpt? Its pretty dense to mold and I've used hard tools to texture in the past. I never tried a sponge, so I may be missing out on a simple technique.
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Hello everyone. My name is John and I recently graduated with departmental honors in Paleontology from the university of Oregon. I regularly collect from the Astoria formation of the Oregon coast and produce replicas of specimens collected there. I'm currently trying to get into graduate programs. I have a few research ideas relating to paleoecology of dinosaurs and the functional morphology of various features seen in dinosaurs and extinct mammals. My main interest is dinosaurs, however my research currently undergoing peer review relates to how ecology, diet, and body mass drive reproductive strategies in extant carnivorous mammals. I currently make fossil replicas using an eco friendly plant based mold making compound that has a low melting point. This material can be melted down in the microwave and poured to produce molds. The benefit to this is that as molds degrade or get damaged they can be broken down and the material reused. I believe I'm the first to use this method of fossil replication. I've attached a section from the left dentary of an Albertosaurus that I replicated using this mold making material.
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Looking at different angles, I think it is incomplete, but Cardium is correct. The gastropod is a subadult Papillina gunteri. Since it is an internal mold, it looks like I should be able to prep a little along the siphonal canal and easily pop it out. I queried Roger and Jessie at the museum on their casting technique. I am hoping to recreate their method to make a cast once the mold is removed.
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Hi Jack The echinoid is Amblypygus americanus, the other echinoid is probably Weisbordella cubae, the jingle shells are Lepidocyclina foraminifera and the large internal bivalve mold is Crassatella. Your unknown is an internal bivalve mold, perhaps Corbula, but I would need to see different angles to be certain. I am also including my pictures from the trip including one of the awesome crabs (Ocalina floridana) that were found that day. Unfortunately I was skunked on crabs.
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Big Unidentified Bivalve internal mold from Formosa Reef, Ontario
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Unidentified Bivalve Internal Mold Middle Devonian Amherstburg Formation Detroit River Group Formosa Reef Formosa, Ontario A generous gift from Kane-
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In the modern professional paleontological community and their publications, 99+% of the people call the internal filling of a mollusk an internal mold. Usage of mold and cast in the past was more varied. If you call the filling of a gastropod an internal mold, it should never be a problem and should be widely and correctly understood by all. Note that the Wikipedia article you cited says that an endocast is an internal mold. Also, note that a well respected college text from 1979, Clarkson’s “Invertebrate Palaentology and Evolution”, book says that the use of cast for an internal mold is not correct.
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- capecanaveralseashore
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This one is an internal mold of a clam.
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Sorry I can't help with ID but that is an internal mold of a very large gastropod. Very good find! Maybe one of our Texas members can help with an ID. @JamieLynn @Jared C
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- canyon lake texas
- gastropod fossil
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So, we have a mold of the exterior of a marine creature . . . wow! This cries out for a cast from the mold! My best guess is fissurellid, a limpet. This one would have been highly sculptured, but some species are sculptured, Hemitoma retiporosa is one example.
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An internal mold of a large spiriferid, I think.
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- fossil claw?
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If one assumes that the Ediacaran lasted from 635 MYA until 538.8 MYA then I have a number of ediacaran fossils that have little to no identification. Any comments or suggestions from Forum members would be greatly appreciated. The first image is the front of an ediacaran fossil from Guizho, China. This specimen is constructed of a relatively fragile high sand content shale. Most notable is the spaghetti like fossil that could be compressed fronds, tubes or perhaps even some type of mold; I have seen nothing like it on the internet. The top of this image depicts a crescent moon shaped fossil and the portion of the lower left may or may not reflect abrasion. The second image is of the back of the Guizhou specimen depicted in image 1. The top of this image depicts another more detailed crescent moon shaped fossil illustrating fine "hairs" on the periphery. There are small less featured fossils in the lower portion of this image. It is possible that the crescent shaped fossils are among the petalonamae. Images 3, 4 and 5 are closeups of the fossils depicted in images 1 and 2. Image number 6 is of Nemiana simplex fossils from the ediacaran in Mulgilw, Ukraine. When I first acquired this specimen it was thought to be a jellyfish attached to the sediment. More recently it has been proposed that it is the result of algae. Any further information would be appreciated. Image 7 is of Prota-medusae fossils from 550 MYA that were found in Gadsden, Alabama. I was pleased to see that such soft bodied creatures were preserved in the fossil record. Comments, suggestions, and corrections are welcome.
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